I think,IMHO, you are installing a lot more charging capacity than you can effectively use with 1050 watts generated with only 200AH
storage.It's a
balancing act for sure with too many unknown variables to design the perfect system, ie system design, amount of sun, shading, not to mention power
consumption . But 1050 is a LOT for 200AH.
I know our modest 280 watt, 145AH system seems to work for us. We spent 5 days off grid last week never starting the generator and generated 2-16
amps off the array during the day. Even during extreme cloud cover we were seeing about a 2 amp production. Of course only SAT TV and a 1000 watt
inverter idling all day with very limited heater use( high 40's at night) and all LED lighting were used-no AC possible with our system.
Everyone's requirements are different for sure. Good luck.
Hal
> I'm going with 6 175w panels, 60x30 inches, canted out to match the curve
> of the roof, I'll be able to tilt them inward to match the sun (so, the
> sunny side should normally have enough tilt to be ok, the other side will
> need to be tilted in rather than out). I have a DC air conditioner, that
> puts out about 9k btu and uses about 600w of 12v DC. We shall see how it
> goes. I'm only going to go with 200Ah of batteries, as the power is for
> running the AC, and I don't plan on having a TV (laptops and fans, mostly,
> for usage).
>
> On Wed, Aug 16, 2017 at 12:21 AM, John Phillips
>
> > 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
> >
> >> 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
> >>
> >>> 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
> >>>
> >>> _______________________________________________
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> >>>
> >>
> >>
> >>
> >> --
> >> Jim Kanomata
> >> Applied/GMC, Newark,CA
> >> jimk
> >>
http://www.appliedgmc.com
> >> 1-800-752-7502
> >> _______________________________________________
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> >>
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> >>
> >
> >
> >
> > --
> >
> > *John Phillips*
> > _______________________________________________
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> >
>
>
>
> --
> Plato seems wrong to me today.
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--
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1975 Eleganza II, 101230
1974 Eagle Bus 45',w/slideout
