2006-08-17 19:42:00 · 11 answers · asked by Anonymous in Consumer Electronics ➔ Other - Electronics
Are you sure this is a 900 Amp/hour battery? more like a 90 possibly.
A 12volt fridge will usually draw 4-6 amps( more if its one of the older types) but you should get 8-10 hours out of it.
Just remember it takes longer to put a charge back in the battery than it does to take it out.
2006-08-17 19:55:22 · answer #1 · answered by rookethorne 6 · 0⤊ 0⤋
OK, we need to guess how many watts of energy your refergerator needs. I'm going to guess around 400 watts- this is assuming its a small, itty bitty refergerator. I could be off a country mile on the wattage, but its for the example of the math ok? Heres how it goes>
1)Wattage (400) /13.8 volts ("12 volt battery")= 35 amps every time it kicks on. 900 Amp Hour battery/35 amps= roughly 24 hours.
Is this realistic? No- first off, I don't know if this is a car battery (designed for high curret, immediate recharging from cars electrical system) or deep cycle RV battery (Designed for long, low discharge)
If you put the car battery on this, it'll work all the way up to the time where it overheats, two plates touch and then the batterys destroyed.
Also, batterys are designed to operate for a maxium of 10 hours at a time- sure, you can play with the math and in theory stack batterys like cord wood and make it last 90 days, if you had unlimited money.
A more common sense approach would be to buy a little portable generator with sufficent power for the refergerator then run it for like 4 hours in the morning, then 4 hours in the afternoon, you could probably leave it for 4 hours each time between cooling off cycles- maybe longer, just make sure the food temp doesn't go over 40 degrees which is the "food danger zone" for food poisoning.
Good Luck
2006-08-17 22:25:54 · answer #2 · answered by Anonymous · 0⤊ 1⤋
Depends on the current (Amps) used by the FRIDGE.
If THE fridge takes 1 amp then a 900 Ampere hour BATTERY will last 900 hours of compressor running time.
AT 10 amps, IT will last 90 hours.
Hope THAT helps
2006-08-17 22:11:33 · answer #3 · answered by Henry 5 · 0⤊ 0⤋
i dont know but my 3 Amp Hr cordless drill battery seems to never quit. 900 amp hours is pretty big. I doubt that a 900amp hour battery would be used to supply a 12V motor.
I think you mean the battery has a rating of 900 peak amps.
I looked up some camp batteries. Your's is probably closer to 18 amp hours.
I also saw some 900 amp hour batteries used by the govt but they were for 128V systems.
2006-08-17 19:51:48 · answer #4 · answered by Munster 4 · 0⤊ 0⤋
It fairly simple to get an approximation:
900Ah (is equal to 900 hours at 1 Amp)
Most mini fridges draw 5 or 6 amps - so divide it up.
150 to 180 hours (theoretically) - if perfect battery, full charged.
In reality much less - 3 or 4 days.
ps. are you SURE it's a 900 Ah and not a 90Ah?
If just a 90 - then you'll get about 10 hours.
2006-08-17 20:43:46 · answer #5 · answered by creviazuk 6 · 0⤊ 0⤋
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2017-02-16 18:43:47 · answer #6 · answered by Anonymous · 0⤊ 0⤋
8 hours
2006-08-17 19:47:33 · answer #7 · answered by halloweenpumpkinuk 4 · 0⤊ 0⤋
I would love to see the size of this 900 Amp/hr battery!!!!!!!!!!!!!
2006-08-20 03:17:40 · answer #8 · answered by Anonymous · 0⤊ 0⤋
depends how much current it uses, whats the wattage?
If it's one amp it will last 37 days and 12 hrs.
2 amps will be half that etc
2006-08-17 19:57:36 · answer #9 · answered by Mickenoss 4 · 0⤊ 0⤋
Your battery rating seems to be high.
I doubt if it is correct.
Also, you need to chk the Fridge power consumption. it wd be stated in " watts ".
2006-08-17 21:22:05 · answer #10 · answered by brown_rice 2 · 0⤊ 0⤋