@drdrowland@fediscience.org
https://www.amazon.com/JJN-Efficiency-Coversion-Rooftop-Off-Grid/dp/B0DHWVDP1D?th=1
a 70usd n-type 100 watt solar panel makes a kilowatthour in ten hours of full sunlight, which costs 35 cents here.
maybe 300 watthours a day at .035 cents per watthour is 10.5 cents per day. it's, like, five dollars in electricity on a terribly hot day. so once every fifty days this 100w solar panel could have time to fill a battery to run the ac. five dollars gets 14.3 kwhr and 5.7 hours of ac at fifty percent duty cycle on and off every ten minutes seems ok. i'm guessing the ac takes 5kw.
to charge enough each day to run the ac that day i will need, like, seventy of these panels.
https://onlinesolartools.com/panel-orientation
i can move the panels twice a year from 47.86° to 27.86° in the summer and always pointed south
https://footprinthero.com/peak-sun-hours-calculator
the above site tells me to expect 5.9 hours of peak sun per day.
14.3 kwhr/5.9 hr = 2.4 kw
24 100 watt panels is 1680usd at the above rate and they could be suspended on poles stabilized with guy-wires in my backyard
or 6 400 watt panels. 450 seems like a common size, and i'd just need six of those. i'd get a battery that could fit two days of ac in it. that's 28.6 kwhr but with 20-80% headroom i'd want 48kwhr and at 80usd/kilowatthour i could collect 3840usd of iron phosphate batteries. the inverter will be a thousand.
this 450watt panel costs 160usd, 35c/watt and i think it will actually ship but it's some unknown to me website
https://www.solar-electric.com/canadian-solar-tophiku6-450w-solar-module.html
six of those is nine hundred dollars and the mppt and battery charge controller will be a few hundred dollars
5 pairs of 12.8v 300ah batteries could be bought with this listing:
https://www.amazon.com/dp/B0F9YG1Y38?th=1
that's 38.4kwhr (23kwhr) for 3000usd and it provides me the ability to store 4.5hr of air conditioner energy.
ten batteries could be put all in series with a single controller and the open circuit voltage would be 128v. each unit can do 200amps so in series we get 200amps, too. the maximum power is 25.6kw. an integrated battery charger with ten 12v battery wires that can all do 200 amps is probably hard to find i haven't looked yet.
an mppt charger that will take power from 6 450w panels seems possible. i bet i will have to pair them up into 5s2p and find an inverter that will take 64v dc.
are there mppt chargers that have spots for ten batteries?
