Mini fridge

trevskoda

trevskoda

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Here is a bargain i spotted, 10 left, half amp draw at 230v so will go 24 hrs on two 100ah batts, don't say I never spotted a no brainer for you lot, just might buy the lot and double the price, these sell for £80 to £95 in shops.
mini fridge bargain.png
 
trevskoda said:
Here is a bargain i spotted, 10 left, half amp draw at 230v so will go 24 hrs on two 100ah batts, . .
Click to expand...
1/2 amp draw at 230v = 10amp draw at 12v using inverter.
10 amp draw for 24 hours = 240 ah

2 x 100 ah batteries usable capacity = (2 x 100) * 50% = 100 ah

In practice you will get around 10 hours before the batteries give up.

So, scam or no scam, only any use when on EHU.
 
250w @ 12v = 20.8 amps (actually including efficiency losses in the invert most likely about 23-25 amps)
so 290AH bats will theoretically run for 14 hours - but thats at a must lower discharge rate, at 20+ amps they will be nothing like 290AH.
But batts should never be discharged below 50% without the possibility of causing irrepairable damage so would run for 7 hours MAX
If you tried to run for 24 hours then you would most likely find that it gives up after 12-14hours and the batteries are then most likely throw-aways and need replacing
So a pretty expensive days cooling!!
 
pmclnz said:
250w @ 12v = 20.8 amps (actually including efficiency losses in the invert most likely about 23-25 amps)
so 290AH bats will theoretically run for 14 hours - but thats at a must lower discharge rate, at 20+ amps they will be nothing like 290AH.
But batts should never be discharged below 50% without the possibility of causing irrepairable damage so would run for 7 hours MAX
If you tried to run for 24 hours then you would most likely find that it gives up after 12-14hours and the batteries are then most likely throw-aways and need replacing
So a pretty expensive days cooling!!
Click to expand...
I ment two 90ah batts and dont forget the fridge only runs 5 mins in about 20, I did a bench test before installing and the bats never dropped below 12.2v
 
trevskoda said:
My one is 250w so can run 24hrs on 290ah bats
Click to expand...

When discussing how long your battery will power a fridge it is best to clarify if the fridge is condenser or absorption.
Comparing the two types is like comparing apples and elephants!

For both types the essential factors in deciding how long your batteries will power a fridge are
a) battery capacity (amp hours)
b) average daily power requirement (watt hours per day) of the fridge.

Max power demand (e.g 250 watts) is irrelevant.
 
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