running a 24v fridge freezer on solar

[gambiasurfgirl]

hi.i found a little fridge freezer that runs on 24v,it uses 1.5amp.I plan to buy and use this on solar.
can someone improve/correct these calculations of mine.

fridge uses 1.5amp x24v = 36w
usage 36w x 24h =864wh
mppt (x1.5) = 1296 wh
insolation = 5 (The Gambia)
solar panel size 1296/5 =260 watts
battery size (864x5)/24=180ah
charge controller 260/24=11amps

now i do realise the fridge will not run 24hr,but will cycle on and off,but thought this will just give me more power so i dont use too much of the battery.
I plan to use 12v solar panels and wire them to make 24v.
(i haven't read up on that yet!)

what do you think???

[inetdog]

hi.i found a little fridge freezer that runs on 24v,it uses 1.5amp.I plan to buy and use this on solar.
can someone improve/correct these calculations of mine.

fridge uses 1.5amp x24v = 36w
usage 36w x 24h =864wh
battery size (864x5)/24=180ah

If you pull 100% of its capacity from the battery each day, it may not last more than a few weeks, months at best.
Your battery size should be at least five times as big as your daily load usage unless you can manage to run the load mostly when the sun is high (~ 5 hours near mid-day.)

[Naptown]

hi.i found a little fridge freezer that runs on 24v,it uses 1.5amp.I plan to buy and use this on solar.
can someone improve/correct these calculations of mine.

fridge uses 1.5amp x24v = 36w
usage 36w x 24h =864wh
mppt (x1.5) = 1296 wh
insolation = 5 (The Gambia)
solar panel size 1296/5 =260 watts
battery size (864x5)/24=180ah
charge controller 260/24=11amps

now i do realise the fridge will not run 24hr,but will cycle on and off,but thought this will just give me more power so i dont use too much of the battery.
I plan to use 12v solar panels and wire them to make 24v.
(i haven't read up on that yet!)

what do you think???

If you pull 100% of its capacity from the battery each day, it may not last more than a few weeks, months at best.
Your battery size should be at least five times as big as your daily load usage unless you can manage to run the load mostly when the sun is high (~ 5 hours near mid-day.)

It appears he has multiplied the daily WH by 5 to arrive at the Ah capacity of the battery.

[inetdog]

It appears he has multiplied the daily WH by 5 to arrive at the Ah capacity of the battery.

More precisely, he has multiplied the daily WH by 5 to arrive at the WH capacity of the battery, and then divided by 24 (the battery voltage) to get the AH. I realize that "arrive at" includes the rest of the calculation, but that might not be clear to the casual reader.