Use the sun to power fridge.

[Mike90250]

11.5kwh / 7 days = 1643 wh daily. That will require about 2,000 wh harvested daily, maybe a bit more just to be safe. 4 hours sun onto a pair of 250w panels ( 500w total ) will be a bit shy of your needed harvest - panels generally only produce about 80% of nameplate. And you don't have enough PV to recharge batteries when they are low, only enough to break even daily.

4ea, 250W panels wired in series/parallel, into a 24V controller, would get you about 30A for recharging a 24V battery. Make that battery up from 4 golf cart 6v, 200a batteries and you have 4,800 wh of storage, which gets you one cloudy day and then dead batteries.

[wdc]

11.5kwh / 7 days = 1643 wh daily. That will require about 2,000 wh harvested daily, maybe a bit more just to be safe. 4 hours sun onto a pair of 250w panels ( 500w total ) will be a bit shy of your needed harvest - panels generally only produce about 80% of nameplate. And you don't have enough PV to recharge batteries when they are low, only enough to break even daily.

4ea, 250W panels wired in series/parallel, into a 24V controller, would get you about 30A for recharging a 24V battery. Make that battery up from 4 golf cart 6v, 200a batteries and you have 4,800 wh of storage, which gets you one cloudy day and then dead batteries.

Thanks Mike90250 but I won't use 250w panels, I will only use two or three 500w panels wired in series and I don't have any access to golf cart batteries, only AGM ones, I'm planning to buy two Ritar AGM 225ah each, for a total of 450ah and 24V, how many days of autonomy would that give me? thanks.

[J.P.M.]

our idea is generally workable, but the weak point is the battery sizing and a small wiring misconception. Two 12V 225Ah AGMs in series give you 24V 225Ah, not 450Ah. That’s about 5.4 kWh total, but realistically only ~2.5–3 kWh usable if you want decent battery life. For a fridge, that may cover roughly 1–2 days, not 4 days of autonomy, especially with an older unit. The 1000W of solar is more than enough for a single fridge and is actually well sized. The 1500W pure sine inverter is also fine, just keep idle consumption low. Overall: solar is solid, inverter is fine, but you’ll likely need either more battery capacity or accept using grid backup during longer cloudy periods.

You do know you're responding to a post that's about 4 1/2 years old and WDC has probably solved his dilemma or moved on, right ?

[SunEagle]

You do know you're responding to a post that's about 4 1/2 years old and WDC has probably solved his dilemma or moved on, right ?

good point J.P.M. sometimes a newbie doesn't look at the post date

[J.P.M.]

good point J.P.M. sometimes a newbie doesn't look at the post date

Yea, I guess it's come down to chasing old posts around. Not a lot of traffic anymore.

[SunEagle]

Yea, I guess it's come down to chasing old posts around. Not a lot of traffic anymore.

Nope. There seems to be less traffic. I thought it had to do because I have not responded lately due to my wife passing last July

[J.P.M.]

Nope. There seems to be less traffic. I thought it had to do because I have not responded lately due to my wife passing last July

My condolences on your loss. I wish you peace.

J.P.M.

[SunEagle]

My condolences on your loss. I wish you peace.

J.P.M.

thank you for your kind words

[J.P.M.]

thank you for your kind words

You are most welcome.
Con molto dolore.

[sdold]

I'm sorry to hear about your wife Vince.
Forums in general seem to be getting less traffic thanks to there being so many alternatives like Reddit, etc. I think the advice here and on other forums is of better quality though thanks to less anonymity and better peer-review by the forum community. Here you' don't seem to get the flood of nonsense answers that you get elsewhere.