Home » Public Forums » GMCnet » Re: [GMCnet] [GMCMH-EFI] speaking of alternators...
| Re: [GMCnet] [GMCMH-EFI] speaking of alternators... [message #322180 is a reply to message #322174] |
Wed, 16 August 2017 02:21   |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma:
|
Senior Member |
|
|
1How much solar can we mount on our GMC?
If you really want to commit to solar, it is possible to mount from 6 to 8
SolarWorld 350 XL mono solar panels (79x40 inches with mounting hardware).
Mount the panels on rails just over the roof air conditioners. 8 x 350 =
3600 yaaa but if you get 2500 watts from the charge controller, you will be
doing really well. The other factors come into play are how much of it do
you need now and how much do you need to store for later. A 2500 watt
system should be able to generate 15,000-watt hours per good sunny day.
How many days do you want to store?
If you stay with 12 volts 15,000/12 = 1,250 usable amper hours per day.
Lead acid batteries need to use 50% of name plate rating or less so you
need 2500 AH/day using a 4 to 6-hour charge/discharge rate.
If you plan on doing this with 6-volt CG2 golf cart batteries, 50 would be
a possible number, two series groups of 25 in parallel. It 'd be good to
use the 100-hour rate, but the peak Sun power does not last 20 to 100
hours. If you are planning on a multi-day battery array maximum current
does not have to be increased unless you plan on having a heavy discharge
load. Now that the first-day current is taken care of the second day does
not need another 50 batteries. I did not do the math but adding 30 more
batteries should come close to a 2-day storage solution. Anyone for a
trailer to carry the batteries?
The battery sizing is based on storing all the power the maximum array can
produce in a day. If you are using some of the power, you will not have
enough energy to fully charge a dischared battery in a day. If you do not
have enough battery, the charge controller will not harvest all the
available energy. A lithium battery system becomes very attractive before
we get to 80 CG2 batteries.
By adding a soft start circuit to your air conditioner and using the solar
array as well as some battery it is possible to run an air conditioner some
of the time. An additional side effect is the solar cells act as a shade
for RV roof. It is surprising how much cooler it is under a solar array
than it is in the hot sun.
As a side note, standard home roof and ground mount systems have to
withstand 100 MPH wind gusts from the least favorable direction, and they
are at an angle rather than flat.
Disclosure:
I designed and installed my home solar system using three different
ratings of the SolarWorld XL mono panels. As time went on the panel ratings
increased and the price decreased. The panel name plate ratings total 9180
watts DC and the YC500A inverters name plate rating total 7000 watts. There
are times the inverters cannot harvest all the energy the panels produce.
Today my system generated 52590 Watt hours with a peak of 7150 watts at
2:01 PM. July's ouput was 1.6MWh, and I paid $1.05 for energy. I do not
have any direct experience with charge controlers.
On Tue, Aug 15, 2017 at 7:46 PM, Jim Kanomata wrote:
> Solar is great when the weather is great. When the dark clouds stay around,
> your not going to be singing the same tune.
> We have installed 200 watt kits and found they are great only when weather
> is good.
> Always keep your generator as a stand by like the spare tire.
>
> On Tue, Aug 15, 2017 at 5:41 PM, Matt Colie wrote:
>
>> Ken,
>>
>> As usual, what you wrote is accurate - for the larger part.
>> But,
>> There is the case of the GMC 23s with the house bank in the front. Then,
>> someone upsized the cables from the isolator and to ground as #4 AWG.
> So,
>> when departing from a weekend of dry camping (with the OE reefer) the
>> alternator belt will squeal and get a surface glaze that makes it even
> worse
>> than it was.
>>
>> And I am thinking, "It is an old design 80 amp alternator, what is going
>> on??"
>>
>> I got a new belt and reset the experiment at home. This time with a Bell
>> current probe attached to a Fluke....
>>
>> Fire up!!
>> What The ??
>> Squeal !! 96 Amps out of the machine and all of 80 to the House Bank.?
>> !Shut it Down.! Lets not do that again. That started the dual belt
> plan.
>>
>> We go back on shore power and guess what??
>> Nothing, that's what. And that is with a PD 9145.
>> The best it would do was 27 amps into a 60% house bank. (So much for the
>> 45 rating.)
>> Shortly after I got the coach (and fried the first of 2 4Ds), I replaced
>> the buzz box with a PD9145w/wizard.
>>
>> It turned out that the culprit here was the #10SAE (~9.4AWG) from the
> back
>> to the front that not only supplies all the house electric to the fuse
>> panel in the back but is expected to do the reverse to recover the house
>> bank from the buzzbox. At only 27 amps, the voltage drop between the
> PD9145
>> and the bank was 0.8V. So available charge E was only 13.6.
>>
>> This story could go on a lot longer and there are actually many parts of
>> this that have been condensed. I would love to have you think I got all
> of
>> this figured out this fast.
>>
>> Matt
>> --
>> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
>> Electronically Controlled Quiet Engine Cooling Fan
>> OE Rear Drum Brakes with Applied Control Arms
>> SE Michigan - Twixt A2 and Detroit
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
*John Phillips*
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
|
|
|
|
Current Time: Fri Sep 27 15:05:41 CDT 2024
Total time taken to generate the page: 0.00967 seconds
|
GMCforum
Search
Help
Register
Login
Home
