Home » Public Forums » GMCnet » [GMCnet] Battery Charging Question
| [GMCnet] Battery Charging Question [message #122359] |
Tue, 19 April 2011 14:47  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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I thought I saw a comment on here awhile back that the power converters were not
the best things to use for charging the batteries.
We do a lot of dry camping and I typically run the Onan for awhile each day to
recharge the batteries, but it seems like I have to run it a really long time to
get the charges up like up to 4 hours, this seems pretty excessive.
Would it be better to hook up a regular battery charger and plug it into a
100vac outlet that the Onan powers and use that to charge the batteries?
Our power converter is a Progressive Dynamics PD9145A with the Charge Wizard on
it.
Thanks
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Battery Charging Question [message #122362 is a reply to message #122359] |
Tue, 19 April 2011 14:59  |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| Ray Erspamer wrote on Tue, 19 April 2011 12:47 |
I thought I saw a comment on here awhile back that the power converters were not
the best things to use for charging the batteries.
... << snipped >> ...
Our power converter is a Progressive Dynamics PD9145A with the Charge Wizard on it.
|
You might have been thinking about a comment I made... I was talking about the original "Buzz Box" converter. NOT a PD like yours. (And the two that I own.)
The Buzz Box is more of a power supply, not a charger. It WILL "over charge" your batteries. Your PD is designed to both charge the batteries _AND_ supply power to your house 12 circuits.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Battery Charging Question [message #122363 is a reply to message #122359] |
Tue, 19 April 2011 15:02 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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here is the whole deal.
http://goo.gl/xhv7v
in the final analysis, you should have a 3 level charger for the house
(bulk,soak,float) and have a combiner so that it works on both battery banks
the converters (buzz-boxz) , will typically boil your battery
gene
On Tue, Apr 19, 2011 at 12:47 PM, Ray Erspamer <78gmc-royale@att.net> wrote:
> I thought I saw a comment on here awhile back that the power converters
> were not
> the best things to use for charging the batteries.
>
> We do a lot of dry camping and I typically run the Onan for awhile each day
> to
> recharge the batteries, but it seems like I have to run it a really long
> time to
> get the charges up like up to 4 hours, this seems pretty excessive.
>
> Would it be better to hook up a regular battery charger and plug it into a
> 100vac outlet that the Onan powers and use that to charge the batteries?
>
> Our power converter is a Progressive Dynamics PD9145A with the Charge
> Wizard on
> it.
>
> Thanks
>
> Ray
>
>
> Ray & Lisa Erspamer
> 78 Royale Center Kitchen
> TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMC-Royale@att.net
> 414-745-3188
> Web Site: http://ray-lisa.page.tl/
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Battery Charging Question [message #122366 is a reply to message #122359] |
Tue, 19 April 2011 15:10 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Ray Erspamer wrote on Tue, 19 April 2011 15:47 |
I thought I saw a comment on here awhile back that the power converters were not the best things to use for charging the batteries.
We do a lot of dry camping and I typically run the Onan for awhile each day to recharge the batteries, but it seems like I have to run it a really long time to get the charges up like up to 4 hours, this seems pretty excessive.
Would it be better to hook up a regular battery charger and plug it into a 100vac outlet that the Onan powers and use that to charge the batteries?
Our power converter is a Progressive Dynamics PD9145A with the Charge Wizard on it.
Thanks
Ray
|
Ray,
You have a Converter/Charger, and in my carefully considered opinion, one of the best ever built.
Other than checking the water level in the house bank every once and a while, leave it alone. A PD9145 will not use much water and the house bank will always be topped up.
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] Battery Charging Question [message #122368 is a reply to message #122362] |
Tue, 19 April 2011 15:12 |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
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Assuming your charger is set up for multi stage charging, it should charge the batteries at the fastest rate reasonable. So a regular battery charger shouldn't help.
The problem with 3 stage charging is that it isn't set up to charge a battery circuit that is also under load since the charger is also seeing the current draw from the load as well as the battery charging current and inferring that all the current is going to the battery. As a result the charger never drops to stage 3. I noted on my charger that for this situation they recommend setting the charger for two stage charging.
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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| Re: [GMCnet] Battery Charging Question [message #122369 is a reply to message #122363] |
Tue, 19 April 2011 15:10 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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Thanks Gene, I do have a battery combiner. So according to the link you gave
me, having the Progressive Dynamics unit with the charge wizard, would you
consider this an ideal setup or should I change something??
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Mr.erf ERFisher <mr.erfisher@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Tue, April 19, 2011 3:02:33 PM
Subject: Re: [GMCnet] Battery Charging Question
here is the whole deal.
http://goo.gl/xhv7v
in the final analysis, you should have a 3 level charger for the house
(bulk,soak,float) and have a combiner so that it works on both battery banks
the converters (buzz-boxz) , will typically boil your battery
gene
On Tue, Apr 19, 2011 at 12:47 PM, Ray Erspamer <78gmc-royale@att.net> wrote:
> I thought I saw a comment on here awhile back that the power converters
> were not
> the best things to use for charging the batteries.
>
> We do a lot of dry camping and I typically run the Onan for awhile each day
> to
> recharge the batteries, but it seems like I have to run it a really long
> time to
> get the charges up like up to 4 hours, this seems pretty excessive.
>
> Would it be better to hook up a regular battery charger and plug it into a
> 100vac outlet that the Onan powers and use that to charge the batteries?
>
> Our power converter is a Progressive Dynamics PD9145A with the Charge
> Wizard on
> it.
>
> Thanks
>
> Ray
>
>
> Ray & Lisa Erspamer
> 78 Royale Center Kitchen
> TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMC-Royale@att.net
> 414-745-3188
> Web Site: http://ray-lisa.page.tl/
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Battery Charging Question [message #122370 is a reply to message #122369] |
Tue, 19 April 2011 15:14 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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you got it all
congrats
gene
On Tue, Apr 19, 2011 at 1:10 PM, Ray Erspamer <78gmc-royale@att.net> wrote:
> Thanks Gene, I do have a battery combiner. So according to the link you
> gave
> me, having the Progressive Dynamics unit with the charge wizard, would you
> consider this an ideal setup or should I change something??
>
> Ray
>
>
> Ray & Lisa Erspamer
> 78 Royale Center Kitchen
> TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMC-Royale@att.net
> 414-745-3188
> Web Site: http://ray-lisa.page.tl/
>
>
>
>
> ________________________________
> From: Mr.erf ERFisher <mr.erfisher@gmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Tue, April 19, 2011 3:02:33 PM
> Subject: Re: [GMCnet] Battery Charging Question
>
> here is the whole deal.
>
> http://goo.gl/xhv7v
>
> in the final analysis, you should have a 3 level charger for the house
> (bulk,soak,float) and have a combiner so that it works on both battery
> banks
>
> the converters (buzz-boxz) , will typically boil your battery
>
> gene
>
>
>
> On Tue, Apr 19, 2011 at 12:47 PM, Ray Erspamer <78gmc-royale@att.net>
> wrote:
>
> > I thought I saw a comment on here awhile back that the power converters
> > were not
> > the best things to use for charging the batteries.
> >
> > We do a lot of dry camping and I typically run the Onan for awhile each
> day
> > to
> > recharge the batteries, but it seems like I have to run it a really long
> > time to
> > get the charges up like up to 4 hours, this seems pretty excessive.
> >
> > Would it be better to hook up a regular battery charger and plug it into
> a
> > 100vac outlet that the Onan powers and use that to charge the batteries?
> >
> > Our power converter is a Progressive Dynamics PD9145A with the Charge
> > Wizard on
> > it.
> >
> > Thanks
> >
> > Ray
> >
> >
> > Ray & Lisa Erspamer
> > 78 Royale Center Kitchen
> > TZE368V101144
> > Wauwatosa, Wisconsin 53226
> > Email: 78GMC-Royale@att.net
> > 414-745-3188
> > Web Site: http://ray-lisa.page.tl/
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> >
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Battery Charging Question [message #122376 is a reply to message #122370] |
Tue, 19 April 2011 16:01 |
 |
WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Ray, this all depends on how things are set up. Let me tell you what works the fastest for us. I too have a new pd45 and the external switch to put it in boost mode anytime I want.
Our 6 batteries are up front. The PD is in back with a 10, or 12g, gauge wire running to the front batteries, too small. Plans for #6 welding cable soon.
Anyway: I have two "charge" lugs on passenger side dash, near the floor. Two heavy cables direct to the batteries. We keep a 30 amp 3 stage charger plugged in and connected to these two lugs when dry camping. When the Onan or Kipor is fired, we get a good 25 plus amp charge direct to batteries. Will charge much faster than the PD. I watch the charge on the battery charger and on my shunt fed amp meter. Most here disagree with me but this is the fastest way I have found to get the batteries to suck current back in.
That being said, we rarely need this due to the solar setup. But, I have it when I want it.
When I run the #6 welding cable to the front I will recheck things. The PO did not do us a favor by running number 10, or 12 g, wire to the batteries.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: [GMCnet] Battery Charging Question [message #122379 is a reply to message #122376] |
Tue, 19 April 2011 16:22 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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so just put your PD up front and problem solved....
gene
On Tue, Apr 19, 2011 at 2:01 PM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Ray, this all depends on how things are set up. Let me tell you what works
> the fastest for us. I too have a new pd45 and the external switch to put it
> in boost mode anytime I want.
> Our 6 batteries are up front. The PD is in back with a 10, or 12g, gauge
> wire running to the front batteries, too small. Plans for #6 welding cable
> soon.
> Anyway: I have two "charge" lugs on passenger side dash, near the floor.
> Two heavy cables direct to the batteries. We keep a 30 amp 3 stage charger
> plugged in and connected to these two lugs when dry camping. When the Onan
> or Kipor is fired, we get a good 25 plus amp charge direct to batteries.
> Will charge much faster than the PD. I watch the charge on the battery
> charger and on my shunt fed amp meter. Most here disagree with me but this
> is the fastest way I have found to get the batteries to suck current back
> in.
> That being said, we rarely need this due to the solar setup. But, I have it
> when I want it.
> When I run the #6 welding cable to the front I will recheck things. The PO
> did not do us a favor by running number 10, or 12 g, wire to the batteries.
> Dan
> --
> Dan & Teri Gregg
>
> http://danandteri.blogspot.com/
>
>
>
>
> _______________________________________________
> GMCnet mailing list
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>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Battery charging [message #358941 is a reply to message #122359] |
Fri, 25 September 2020 15:08 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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I say a lot depends upon the design of the coach. House battery
bank is very close to the "converter" and voltage drop losses would
consequently be much less of a disadvantage.
D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
________________________________
From: Gmclist on behalf of James Hupy via Gmclist
Sent: Friday, September 25, 2020 15:04
To: gmclist@list.gmcnet.org
Cc: James Hupy
Subject: Re: [GMCnet] Battery charging
Converter has a max charge rate of 45 amps. Engine alternators 80 - 100
amps.
Neither system will charge batteries at their max. It depends upon
resistance in the charging circuit. Converters are a long way from the
engine battery. Auto alternators are a shorter distance with twice the
output. You can do the math.
Jim Hupy
Salem, Oregon
On Fri, Sep 25, 2020, 12:07 PM Vadim Jitkov via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Just a small thought experiment here - what is a better way (more
> efficient and/or I suppose a faster way) to charge the house batteries when
> not
> connected to the grid - Onan generator or 455 main engine?
> Onan generator is 6,000W. It feeds power into 110 house system, which is
> then connected to batteries through battery charger/maintainer.
> Main engine is 455 with what I believe a standard no frills alternator
> setup. Is there a way to poke the head into the engine compartment and
> figure
> out how many Amps the alternator is rated for?
> --
> Vadim Jitkov
> '76 Glenbrook 26'
> Pullman, WA
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| Re: [GMCnet] Battery charging [message #358943 is a reply to message #122359] |
Fri, 25 September 2020 15:09 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Senior Member |
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If you really want to go fast do both
On Fri, Sep 25, 2020 at 1:05 PM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Converter has a max charge rate of 45 amps. Engine alternators 80 - 100
> amps.
> Neither system will charge batteries at their max. It depends upon
> resistance in the charging circuit. Converters are a long way from the
> engine battery. Auto alternators are a shorter distance with twice the
> output. You can do the math.
> Jim Hupy
> Salem, Oregon
>
> On Fri, Sep 25, 2020, 12:07 PM Vadim Jitkov via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Just a small thought experiment here - what is a better way (more
>> efficient and/or I suppose a faster way) to charge the house batteries
> when
>> not
>> connected to the grid - Onan generator or 455 main engine?
>> Onan generator is 6,000W. It feeds power into 110 house system, which is
>> then connected to batteries through battery charger/maintainer.
>> Main engine is 455 with what I believe a standard no frills alternator
>> setup. Is there a way to poke the head into the engine compartment and
>> figure
>> out how many Amps the alternator is rated for?
>> --
>> Vadim Jitkov
>> '76 Glenbrook 26'
>> Pullman, WA
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
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*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Battery charging [message #358945 is a reply to message #122359] |
Fri, 25 September 2020 16:49 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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No one asked about fuel consumption. The faster the charge rate, the more
fuel is consumed. Fact of life.
Jim Hupy
Salem, Oregon
On Fri, Sep 25, 2020, 2:40 PM Larry Davick via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I suspect the generator will use less fuel than the engine at idle.
>
> Larry Davick
> A Mystery Machine
> 1976 Palm Beach
>
>> On Sep 25, 2020, at 1:38 PM, Vadim Jitkov via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> Didn't think about distance from source of electricity to the battery.
> In my case, the house batteries are in the back by the generator. This puts
>> the alternator much further away than the charger/converter. I guess
> I'll try to find a datasheet on the charger to see what it can output. Is
> there
>> some simple formula or rule of thumb for what the current/voltage drop
> is depending on wire length and size?
>> --
>> Vadim Jitkov
>> '76 Glenbrook 26'
>> Pullman, WA
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
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| Re: [GMCnet] Battery charging [message #358947 is a reply to message #358945] |
Fri, 25 September 2020 18:29 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Will idle from the 455 charge as fast as if you are driving?
On Fri, Sep 25, 2020 at 2:50 PM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:
> No one asked about fuel consumption. The faster the charge rate, the more
> fuel is consumed. Fact of life.
> Jim Hupy
> Salem, Oregon
>
> On Fri, Sep 25, 2020, 2:40 PM Larry Davick via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> I suspect the generator will use less fuel than the engine at idle.
>>
>> Larry Davick
>> A Mystery Machine
>> 1976 Palm Beach
>>
>>> On Sep 25, 2020, at 1:38 PM, Vadim Jitkov via Gmclist > gmclist@list.gmcnet.org> wrote:
>>>
>>> Didn't think about distance from source of electricity to the battery.
>> In my case, the house batteries are in the back by the generator. This
> puts
>>> the alternator much further away than the charger/converter. I guess
>> I'll try to find a datasheet on the charger to see what it can output.
> Is
>> there
>>> some simple formula or rule of thumb for what the current/voltage drop
>> is depending on wire length and size?
>>> --
>>> Vadim Jitkov
>>> '76 Glenbrook 26'
>>> Pullman, WA
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> _______________________________________________
>> GMCnet mailing list
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>>
> _______________________________________________
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*John Phillips*
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John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Battery charging [message #358949 is a reply to message #358947] |
Fri, 25 September 2020 18:36 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Probably not.
Jim Hupy
Salem, Oregon
On Fri, Sep 25, 2020, 4:30 PM John Phillips via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Will idle from the 455 charge as fast as if you are driving?
>
> On Fri, Sep 25, 2020 at 2:50 PM James Hupy via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> No one asked about fuel consumption. The faster the charge rate, the more
>> fuel is consumed. Fact of life.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Fri, Sep 25, 2020, 2:40 PM Larry Davick via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> I suspect the generator will use less fuel than the engine at idle.
>>>
>>> Larry Davick
>>> A Mystery Machine
>>> 1976 Palm Beach
>>>
>>>> On Sep 25, 2020, at 1:38 PM, Vadim Jitkov via Gmclist >> gmclist@list.gmcnet.org> wrote:
>>>>
>>>> Didn't think about distance from source of electricity to the
> battery.
>>> In my case, the house batteries are in the back by the generator. This
>> puts
>>>> the alternator much further away than the charger/converter. I guess
>>> I'll try to find a datasheet on the charger to see what it can output.
>> Is
>>> there
>>>> some simple formula or rule of thumb for what the current/voltage
> drop
>>> is depending on wire length and size?
>>>> --
>>>> Vadim Jitkov
>>>> '76 Glenbrook 26'
>>>> Pullman, WA
>>>>
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>
>
> --
>
> *John Phillips*
> _______________________________________________
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| Re: [GMCnet] Battery Charging Question [message #358955 is a reply to message #122359] |
Fri, 25 September 2020 20:41 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Lead acid batteries typically do not like to be charged at rate higher than 5C without shortening their life. So for a 100Amp hr battery, 5C is 100/5 = 20 amps. If you are running two 6 volt golf cart batteries that is about 40 amps. In either case from discharge that is 5 hours plus about another hour because the battery charge is not 100% efficient. So considering you don't go below 50% depth of discharge you are still looking at 2.5-3 hours. But you also do not want to run 5C right to full charge you are still looking at 5 hours or so.
This is where LiFePo4 batteries shine in that you can take them down to 80% DoC and can then recharge them at a much higher rate so from 80%DoC you can recharge in 2-3 hours.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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