Home » Public Forums » GMCnet » [GMCnet] News for those who use big inverters...
| [GMCnet] News for those who use big inverters... [message #222130] |
Thu, 12 September 2013 11:39  |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma: 2
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Senior Member |
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Short story:
THIS is out on the market now, and it looks pretty cool:
http://www.emarineinc.com/products/Magnum-MSH3012M-3000W-12V-Pure-Sine-Wave-Inverter.html
allowing your generator power to combine with your inverter power, to power bigger loads,
suddenly making those smaller 2.8k generators feasible options for our space-challenged RVs
(and i got a much better price quote at RVSolarElectric.com)
Long story:
We invested in a big solar array on top of the Eleganza some years ago,
and hardly ever run the generator anymore... except when we really need the air con!
(like at BurningMan 2 weeks ago)... Well, ashes to ashes, dust to dust (dust in the brushes?)
now the 35 year old Onan stopped putting out voltage, and so we stopped by Jim K's for diagnosis,
and its NOT the easy/cheap bridge rectifier, So... not wanting to throw good money after bad,
Its time to put the original Onan 6k out to pasture
However, as most of you know, there are no easy replacement generators to fill this same slot,
Apparently nothing currently under production except for the Onan Microlite RV QG 2800 watt...
Larger models require cutting into the battery compartment (and unfortunately we can't do that...
Ours is occupied by 2 Trojan T-145s, linked to 4 more up front, and there's really nowhere else to put them!)
So hmmm... 2800 watts for a generator isn't so practical, or exciting...
Even though we only run one roof air, it'd be nice to have some headroom for the battery charger,
hot water heater, appliances and studio gear. 4k or more would be nice, but applicably-sized (discontinued)
Hondas and Generacs just aren't showing up, used.
After all, our Magnum inverter / charger is 2800 watt sine wave, and allows surges to 3600 watts, and we've been really happy with it. With the 1000 watt solar array feeding the batteries, we can run the water heater off the Magnum, or even the air con for short blasts, without firing up the noisy thirsty Onan. So it'd be a weird fit to have our new generator actually less powerful than our inverter! (Yet why would we want to custom install some rather large generator, when we hardly ever use it?)
So i called Magnum to see if there was a possible mode setting that would allow charging the batteries while simultaneously running the inverter, as opposed to its default generator or shore power pass-through (with our model MS2812); so we wouldn't have to "power manage" and be so vigilant with our usage. If the AC draw could be from the inverter rather than the generator, then the inverter's "surge" 3600 watt headroom would probably be enough to allow this system to work for our usage patterns. Otherwise, it'd be rather inefficient and silly to have to run the generator JUST to charge the 6 big batteries, or JUST to run air con, one operation at a time...
So was there a mode or setting to allow this? The answer was no... Not for the model MS2812....
nor any other previous Magnum model... Its either pass-through / charging or inverter mode
(and so the only work-around i could see would be to install a 2nd battery charger,
which would only be used for those times that the generator and inverter were running simultaneously... not practical)
But then they told me about this new product:
http://www.emarineinc.com/products/Magnum-MSH3012M-3000W-12V-Pure-Sine-Wave-Inverter.html
This "hybrid" model will actually combine your shore (generator) power with any needed inverter power, to allow for larger loads.
So, that 2800 watt generator is now a great option, since the Magnum could also combine its 3000 watts of inverter power
when needed... allowing for loads up to 5800 watts. Since the battery charger is built into the inverter, I would imagine that this switching happens dynamically and proportionally, so that the batteries get charged when the AC load is under the generator's capacity of 2800 watts. For example, if your 13,500 BTU air con (plus any other AC draw) is taking x number of watts, then any spare generator AC will charge the batteries with whatever remaining wattage is available. Or, if you're running air con, water heater and some other appliances, far beyond the generator's 2800 watt capacity, then the inverter kicks and draws from the batteries a bit, to allow the larger loads.
This is the theory as far as i understand it, but before i'd commit the funds and swap out my inverter, i'd want to confirm the efficiency of this, and with respect to the generator (I could imagine that this type of inverter/charger could have smaller generators running at max capacity a lot of the time, and i'm not sure if this is good for the life expectancy of these smaller generators?) This is the only potential downside that i see, other than the overall unexpected COST of a new generator plus inverter upgrade (i'm trying my best to look at this as a long-term investment :)
So this new Magnum is back-ordered for a couple more weeks anyway, so i've got some time to ponder it; but if this really is my best option, then i'd probably pull the trigger on the Onan 2800 watt in the next week or so.... Anybody have some observations or experience in these directions? (or a cheap Generac 4.8k for sale? :)
OK, Thanks for reading!
Greg
SolarSonic / Los Angeles (currently in Marin County)
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| Re: [GMCnet] News for those who use big inverters... [message #222134 is a reply to message #222130] |
Thu, 12 September 2013 13:06  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Greg,
Let's say a GMC has two six volt deep cycle which are 245 AH and you install one of these 2800 watt generators.
The GMC has the following equipment running off 120 VAC (the watts listed are GUESSTIMATES!)
Water Heater - 1500
Roof Air - 1800
Fridge - 900
Converter / Battery Charger - 540
Microwave - 1500
Coffee Pot - 1000
Toaster - 1200
Etc.
Just how long could one expect the two deep cycle batteries to provide a power boost for the higher load above 2800 watts?
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ek_Lektro
Sent: Thursday, September 12, 2013 11:39 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] News for those who use big inverters...
Short story:
THIS is out on the market now, and it looks pretty cool:
http://www.emarineinc.com/products/Magnum-MSH3012M-3000W-12V-Pure-Sine-Wave-Inverter.html
allowing your generator power to combine with your inverter power, to power bigger loads,
suddenly making those smaller 2.8k generators feasible options for our space-challenged RVs
(and i got a much better price quote at RVSolarElectric.com)
Long story:
We invested in a big solar array on top of the Eleganza some years ago,
and hardly ever run the generator anymore... except when we really need the air con!
(like at BurningMan 2 weeks ago)... Well, ashes to ashes, dust to dust (dust in the brushes?)
now the 35 year old Onan stopped putting out voltage, and so we stopped by Jim K's for diagnosis,
and its NOT the easy/cheap bridge rectifier, So... not wanting to throw good money after bad,
Its time to put the original Onan 6k out to pasture
However, as most of you know, there are no easy replacement generators to fill this same slot,
Apparently nothing currently under production except for the Onan Microlite RV QG 2800 watt...
Larger models require cutting into the battery compartment (and unfortunately we can't do that...
Ours is occupied by 2 Trojan T-145s, linked to 4 more up front, and there's really nowhere else to put them!)
So hmmm... 2800 watts for a generator isn't so practical, or exciting...
Even though we only run one roof air, it'd be nice to have some headroom for the battery charger,
hot water heater, appliances and studio gear. 4k or more would be nice, but applicably-sized (discontinued)
Hondas and Generacs just aren't showing up, used.
After all, our Magnum inverter / charger is 2800 watt sine wave, and allows surges to 3600 watts, and we've been really happy with
it. With the 1000 watt solar array feeding the batteries, we can run the water heater off the Magnum, or even the air con for short
blasts, without firing up the noisy thirsty Onan. So it'd be a weird fit to have our new generator actually less powerful than our
inverter! (Yet why would we want to custom install some rather large generator, when we hardly ever use it?)
So i called Magnum to see if there was a possible mode setting that would allow charging the batteries while simultaneously running
the inverter, as opposed to its default generator or shore power pass-through (with our model MS2812); so we wouldn't have to "power
manage" and be so vigilant with our usage. If the AC draw could be from the inverter rather than the generator, then the inverter's
"surge" 3600 watt headroom would probably be enough to allow this system to work for our usage patterns. Otherwise, it'd be rather
inefficient and silly to have to run the generator JUST to charge the 6 big batteries, or JUST to run air con, one operation at a
time...
So was there a mode or setting to allow this? The answer was no... Not for the model MS2812....
nor any other previous Magnum model... Its either pass-through / charging or inverter mode
(and so the only work-around i could see would be to install a 2nd battery charger,
which would only be used for those times that the generator and inverter were running simultaneously... not practical)
But then they told me about this new product:
http://www.emarineinc.com/products/Magnum-MSH3012M-3000W-12V-Pure-Sine-Wave-Inverter.html
This "hybrid" model will actually combine your shore (generator) power with any needed inverter power, to allow for larger loads.
So, that 2800 watt generator is now a great option, since the Magnum could also combine its 3000 watts of inverter power
when needed... allowing for loads up to 5800 watts. Since the battery charger is built into the inverter, I would imagine that this
switching happens dynamically and proportionally, so that the batteries get charged when the AC load is under the generator's
capacity of 2800 watts. For example, if your 13,500 BTU air con (plus any other AC draw) is taking x number of watts, then any
spare generator AC will charge the batteries with whatever remaining wattage is available. Or, if you're running air con, water
heater and some other appliances, far beyond the generator's 2800 watt capacity, then the inverter kicks and draws from the
batteries a bit, to allow the larger loads.
This is the theory as far as i understand it, but before i'd commit the funds and swap out my inverter, i'd want to confirm the
efficiency of this, and with respect to the generator (I could imagine that this type of inverter/charger could have smaller
generators running at max capacity a lot of the time, and i'm not sure if this is good for the life expectancy of these smaller
generators?) This is the only potential downside that i see, other than the overall unexpected COST of a new generator plus
inverter upgrade (i'm trying my best to look at this as a long-term investment :)
So this new Magnum is back-ordered for a couple more weeks anyway, so i've got some time to ponder it; but if this really is my best
option, then i'd probably pull the trigger on the Onan 2800 watt in the next week or so.... Anybody have some observations or
experience in these directions? (or a cheap Generac 4.8k for sale? :)
OK, Thanks for reading!
Greg
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] News for those who use big inverters... [message #222140 is a reply to message #222130] |
Thu, 12 September 2013 14:57 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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Let's see: 2800 watts/12 volts = 233 amperes.
With a 245 Ampere Hour battery it would run for
245/233 = 1.05 Hours
Am I right?
-Bill
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: [GMCnet] News for those who use big inverters... [message #222150 is a reply to message #222140] |
Thu, 12 September 2013 16:45 |
1275gtsport
Messages: 272
Registered: September 2009
Location: Rothesay NB
Karma: 0
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Senior Member |
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| bwevers wrote on Thu, 12 September 2013 16:57 |
Let's see: 2800 watts/12 volts = 233 amperes.
With a 245 Ampere Hour battery it would run for
245/233 = 1.05 Hours
Am I right?
-Bill
|
you are sort of right except that you only want to run the batteries down 50% so just about 30 minutes. with new batteries, older batteries less time.
Adam Raeburn
Rothesay, NB
1976 Austin Mini
1977 GMC Palm Beach
---------------------------------------------------
Once you replace everything that is attached to something else. It will all be fixed.
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| Re: [GMCnet] News for those who use big inverters... [message #222152 is a reply to message #222130] |
Thu, 12 September 2013 16:49 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Senior Member |
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The entire story sounded great until I saw the 73 pounds and $2800 for the
unit.
On Thu, Sep 12, 2013 at 12:39 PM, Ek_Lektro <eklektro@gmail.com> wrote:
> Short story:
> THIS is out on the market now, and it looks pretty cool:
>
> http://www.emarineinc.com/products/Magnum-MSH3012M-3000W-12V-Pure-Sine-Wave-Inverter.html
> allowing your generator power to combine with your inverter power, to
> power bigger loads,
> suddenly making those smaller 2.8k generators feasible options for our
> space-challenged RVs
> (and i got a much better price quote at RVSolarElectric.com)
>
> Long story:
> We invested in a big solar array on top of the Eleganza some years ago,
> and hardly ever run the generator anymore... except when we really need
> the air con!
> (like at BurningMan 2 weeks ago)... Well, ashes to ashes, dust to dust
> (dust in the brushes?)
> now the 35 year old Onan stopped putting out voltage, and so we stopped by
> Jim K's for diagnosis,
> and its NOT the easy/cheap bridge rectifier, So... not wanting to throw
> good money after bad,
> Its time to put the original Onan 6k out to pasture
>
> However, as most of you know, there are no easy replacement generators to
> fill this same slot,
> Apparently nothing currently under production except for the Onan
> Microlite RV QG 2800 watt...
> Larger models require cutting into the battery compartment (and
> unfortunately we can't do that...
> Ours is occupied by 2 Trojan T-145s, linked to 4 more up front, and
> there's really nowhere else to put them!)
>
> So hmmm... 2800 watts for a generator isn't so practical, or exciting...
> Even though we only run one roof air, it'd be nice to have some headroom
> for the battery charger,
> hot water heater, appliances and studio gear. 4k or more would be nice,
> but applicably-sized (discontinued)
> Hondas and Generacs just aren't showing up, used.
> After all, our Magnum inverter / charger is 2800 watt sine wave, and
> allows surges to 3600 watts, and we've been really happy with it. With the
> 1000 watt solar array feeding the batteries, we can run the water heater
> off the Magnum, or even the air con for short blasts, without firing up the
> noisy thirsty Onan. So it'd be a weird fit to have our new generator
> actually less powerful than our inverter! (Yet why would we want to custom
> install some rather large generator, when we hardly ever use it?)
>
> So i called Magnum to see if there was a possible mode setting that would
> allow charging the batteries while simultaneously running the inverter, as
> opposed to its default generator or shore power pass-through (with our
> model MS2812); so we wouldn't have to "power manage" and be so vigilant
> with our usage. If the AC draw could be from the inverter rather than the
> generator, then the inverter's "surge" 3600 watt headroom would probably be
> enough to allow this system to work for our usage patterns. Otherwise, it'd
> be rather inefficient and silly to have to run the generator JUST to charge
> the 6 big batteries, or JUST to run air con, one operation at a time...
>
> So was there a mode or setting to allow this? The answer was no... Not
> for the model MS2812....
> nor any other previous Magnum model... Its either pass-through /
> charging or inverter mode
> (and so the only work-around i could see would be to install a 2nd battery
> charger,
> which would only be used for those times that the generator and inverter
> were running simultaneously... not practical)
>
> But then they told me about this new product:
>
> http://www.emarineinc.com/products/Magnum-MSH3012M-3000W-12V-Pure-Sine-Wave-Inverter.html
> This "hybrid" model will actually combine your shore (generator) power
> with any needed inverter power, to allow for larger loads.
> So, that 2800 watt generator is now a great option, since the Magnum could
> also combine its 3000 watts of inverter power
> when needed... allowing for loads up to 5800 watts. Since the battery
> charger is built into the inverter, I would imagine that this switching
> happens dynamically and proportionally, so that the batteries get charged
> when the AC load is under the generator's capacity of 2800 watts. For
> example, if your 13,500 BTU air con (plus any other AC draw) is taking x
> number of watts, then any spare generator AC will charge the batteries with
> whatever remaining wattage is available. Or, if you're running air con,
> water heater and some other appliances, far beyond the generator's 2800
> watt capacity, then the inverter kicks and draws from the batteries a bit,
> to allow the larger loads.
>
> This is the theory as far as i understand it, but before i'd commit the
> funds and swap out my inverter, i'd want to confirm the efficiency of this,
> and with respect to the generator (I could imagine that this type of
> inverter/charger could have smaller generators running at max capacity a
> lot of the time, and i'm not sure if this is good for the life expectancy
> of these smaller generators?) This is the only potential downside that i
> see, other than the overall unexpected COST of a new generator plus
> inverter upgrade (i'm trying my best to look at this as a long-term
> investment :)
>
> So this new Magnum is back-ordered for a couple more weeks anyway, so i've
> got some time to ponder it; but if this really is my best option, then i'd
> probably pull the trigger on the Onan 2800 watt in the next week or so....
> Anybody have some observations or experience in these directions? (or a
> cheap Generac 4.8k for sale? :)
>
> OK, Thanks for reading!
> Greg
> SolarSonic / Los Angeles (currently in Marin County)
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: [GMCnet] News for those who use big inverters... [message #222157 is a reply to message #222134] |
Thu, 12 September 2013 17:54 |
mschultz
Messages: 113
Registered: September 2010
Location: Maple City, MI
Karma: 0
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Senior Member |
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Rob, I am sorry but this was definitely a LOL moment. I am imagining you, standing in the shower while you are brewing your coffee and making toast, with the air conditioning on high, beer cooling in the frig. and simultaneously charging your batteries and your etc.That is a whole lot of electricity. Since the man has 6 deep cells, a solar array, a huge inverter and at least an 80 amp alternator on a 403 or maybe a 455 engine, I am thinking there are a lot of ways to go besides 2800 dollars for another gismo. First off, not wanting to offend anyone, but a toaster only toasts for a couple of minutes a day. Same with a microwave. A LP frig is a lot less money then this inverter. Adding more solar will help. The big horse in the house is the AC. It is always going to be the deal breaker. After 3 days of trying to get the Onan to put out more then 3 volts and the fact that we have never had the use of the generator in four years including the trip to 106 degrees Missouri, last summer, I cut the cords today. With room for a couple more batteries, we are good to go. If it gets that hot, we will have to find a place to plug in. Lots of LED's, no toaster, Microwave only when we are plugged in and the LP stove, our only electron eater is the original fridge and when it dies, we go to LP. Oh ya, no TV.
M Schultz
small pension
77 403 Palm Beach 'The Pickle'
Michigan
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| Re: [GMCnet] News for those who use big inverters... [message #222163 is a reply to message #222130] |
Thu, 12 September 2013 18:23 |
zhagrieb
Messages: 676
Registered: August 2009
Location: Portland Oregon
Karma: 0
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Senior Member |
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I've had a 2800 watt Onan for some years and am more than satisfied with its capacity. It will run my 13.5K roof air AND microwave at the same time. Certainly could run AC and water heater together.
The Onan also powers a Xantrex charger keeping the house and engine batteries up .
A relay tucked into the breaker box switches (both hot and neutral legs please) 3 outlets to my Xantrex 2000 watt inverter when the inverter is activated. The inverter can then run other stuff at the same time. Don't think I'd ever need toaster, coffee maker, iron, hair dryer, etc. simultaneously but hey, I'm ready.
BTW, the Xantrex claims a peak rating of 3000w. Yeah, Xantrex tells me, for perhaps 1 whole second. Be careful of "peak" promises for inverters.
Glenn Giere, Portland OR, K7GAG
'73 "Moby the Motorhome" 26'
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| Re: [GMCnet] News for those who use big inverters... [message #222197 is a reply to message #222157] |
Thu, 12 September 2013 20:51 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Michael,
I LOVE making people laugh with or AT me; doesn't matter.
I am kinda lame when it comes to electrical stuff so I just threw all that out there and figger'd someone smarter could figger out
if the gizmo was viable. It appears that it's not for the "average" GMCer.
In the mornings I'll run hot water, a Keurig single cup maker, toaster, the roof air, and run 12 volt lights on the convertor so all
that stuff is consuming watts at the same time.
Regards,
Rob M.
-----Original Message-----
From: Michael Schultz
Rob, I am sorry but this was definitely a LOL moment. I am imagining you, standing in the shower while you are brewing your coffee
and making toast, with the air conditioning on high, beer cooling in the frig. and simultaneously charging your batteries and your
etc.That is a whole lot of electricity. Since the man has 6 deep cells, a solar array, a huge inverter and at least an 80 amp
alternator on a 403 or maybe a 455 engine, I am thinking there are a lot of ways to go besides 2800 dollars for another gismo. First
off, not wanting to offend anyone, but a toaster only toasts for a couple of minutes a day. Same with a microwave. A LP frig is a
lot less money then this inverter. Adding more solar will help. The big horse in the house is the AC. It is always going to be the
deal breaker. After 3 days of trying to get the Onan to put out more then 3 volts and the fact that we have never had the use of the
generator in four years including the trip to 106 degrees Missouri, last s
ummer, I cut the cords today. With room for a couple more batteries, we are good to go. If it gets that hot, we will have to find a
place to plug in. Lots of LED's, no toaster, Microwave only when we are plugged in and the LP stove, our only electron eater is the
original fridge and when it dies, we go to LP. Oh ya, no TV.
M Schultz
small pension
77 403 Palm Beach 'The Pickle'
Michigan
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] News for those who use big inverters... [message #222299 is a reply to message #222130] |
Fri, 13 September 2013 15:31 |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma: 2
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Senior Member |
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hey Rob,
I guess i should've prefaced my posting from the perspective of "mobile studio"...
or those who need 110v power constantly, and prefer not to be running a generator all the time.
I know this puts me in a small niche within the already rather small GMC niche;
but i figured some other users would probably like to know about the new inverter technology
(whether they actually needed it themselves or not)
So in answer to your question,
If the GMC only has (2) standard Trojan T-105's installed, and with the loads you have listed,
well, of course this isn't a good match for any 3000 watt inverter system
(except for short blasts like coffee maker, etc)...
even in the proposed 2800 watt generator + new 3000 watt hybrid inverter system,
its definitely not practical, and you'd wear out your batteries prematurely
However, if rather than the standard (2) batteries, you've got a bank of (4) T-105's,
well then you've got a manageable system,
and i'd say this is the minimum battery bank for such inverter usage
(but you'd still have to be vigilant)
Or in my case, with (6) of the larger T-145's, You can definitely take advantage of the inverter :)
Greg
> Let's say a GMC has two six volt deep cycle which are 245 AH and you install one of these 2800 watt generators.
>
> The GMC has the following equipment running off 120 VAC (the watts listed are GUESSTIMATES!)
>
> Water Heater - 1500
> Roof Air - 1800
> Fridge - 900
> Converter / Battery Charger - 540
> Microwave - 1500
> Coffee Pot - 1000
> Toaster - 1200
> Etc.
>
> Just how long could one expect the two deep cycle batteries to provide a power boost for the higher load above 2800 watts?
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| Re: [GMCnet] News for those who use big inverters... [message #222311 is a reply to message #222203] |
Fri, 13 September 2013 17:16 |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
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Senior Member |
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Yeah don't toss it. It's amazing how fixable these things are. I'd love to
actually be an Onan guru. :)
As for needing another, I'm hoping that JimB gets the kinks worked out of
the Dometic 3000 briefcase generator setup, and I can get a turnkey
solution for the Royale that way. :)
I need a damn Bat Cave for all my projects! I own five acres of pine trees,
but it's 100 miles from anywhere, including here! A nice Quonset hut for my
coaches, cars, boats, giant walking robot (in conceptual stages), airship
(also conceptual), Onan refurbishing bay, lift, pit, and a 300 foot tower
for ham radio stuff would be nice. :)
On Thursday, September 12, 2013, A. wrote:
>
>
> mschultz wrote on Thu, 12 September 2013 17:54
> > ...After 3 days of trying to get the Onan to put out more then 3 volts
> and the fact that we have never had the use of the generator in four years
> including the trip to 106 degrees Missouri, last summer, I cut the cords
> today. ...
> Don't throw that Onan away. Someone is always looking for Onan parts.
>
> If we could figure out how to get it from MI to MS, Robin Hood needs one.
>
> And we would keep throwing ideas at him until he gets it to output correct
> voltage and current at the right frequency.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
> _______________________________________________
> GMCnet mailing list
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>
--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
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| Re: [GMCnet] News for those who use big inverters... [message #222312 is a reply to message #222311] |
Fri, 13 September 2013 17:24 |
mojoe
Messages: 319
Registered: November 2012
Location: Monroe, NC
Karma: 0
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Senior Member |
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Wow Robin! That's one heck of a list! So when is the little woman gonna let you start buying those things???
Joe Kemenczky..
1975 Eleganza ll " Odie " 75,000 miles..
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain.
.
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| Re: [GMCnet] News for those who use big inverters... [message #222313 is a reply to message #222175] |
Fri, 13 September 2013 17:43 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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Matt,
Ok, so according to Herr Doktor Peukert:
time to fully discharge = H(C/IH)^1.2
Assuming two golf cart batteries are rated at 245 ampere hours,
H = 20 hours at rated capacity; I = 233 Amps; C= 245
time to fully discharge = 0.58 hours or 35 minutes with 2.8KW
-Bill
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: [GMCnet] News for those who use big inverters... [message #222316 is a reply to message #222313] |
Fri, 13 September 2013 17:56 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| bwevers wrote on Fri, 13 September 2013 18:43 |
Matt,
Ok, so according to Herr Doktor Peukert:
time to fully discharge = H(C/IH)^1.2
Assuming two golf cart batteries are rated at 245 ampere hours,
H = 20 hours at rated capacity; I = 233 Amps; C= 245
time to fully discharge = 0.58 hours or 35 minutes with 2.8KW
-Bill
|
Yes Bill,
I won't argue with the 1.2, but now you get the idea.
When you think about, this explains a lot of the things you see going wrong....
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] News for those who use big inverters... [message #222377 is a reply to message #222299] |
Sat, 14 September 2013 07:35 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Greg,
And I should have prefaced my message with; "I screwed up!" I installed a Xantrex SW-2000 inverter running off two 245 AH 6vdc deep
cycle batteries under the pax bed and one 12vdc deep cycle battery up front under the pax seat (this battery probably doesn't
contribute diddley squat because of the long run of wire down to the back batteries). I installed it to be able to run the
microwave, coffee pot, toaster (one at a time) without running the Onan. I checked the power requirements of each of the appliances
and 2000w would cover it. After I finished the installation I discovered that the microwave would run for about 15 seconds then
quit. The current draw would pull the voltage below the minimum required by the Xantrex and it would shut off.
To make this work I probably need two more 245 AH 6vdc batteries under the bed, however, there isn't room for them so I'll probably
have to install them externally next to the Onan. The problem with that is all my dump stuff is in there so I have to find someplace
else for that.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ek_Lektro
Sent: Friday, September 13, 2013 3:32 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] News for those who use big inverters...
hey Rob,
I guess i should've prefaced my posting from the perspective of "mobile studio"...
or those who need 110v power constantly, and prefer not to be running a generator all the time.
I know this puts me in a small niche within the already rather small GMC niche;
but i figured some other users would probably like to know about the new inverter technology
(whether they actually needed it themselves or not)
So in answer to your question,
If the GMC only has (2) standard Trojan T-105's installed, and with the loads you have listed,
well, of course this isn't a good match for any 3000 watt inverter system
(except for short blasts like coffee maker, etc)...
even in the proposed 2800 watt generator + new 3000 watt hybrid inverter system,
its definitely not practical, and you'd wear out your batteries prematurely
However, if rather than the standard (2) batteries, you've got a bank of (4) T-105's,
well then you've got a manageable system,
and i'd say this is the minimum battery bank for such inverter usage
(but you'd still have to be vigilant)
Or in my case, with (6) of the larger T-145's, You can definitely take advantage of the inverter :)
Greg
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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