Power inverter battery

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  #1  
Old 01-06-13, 12:33 PM
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Power inverter battery

Bought a 2400 watt inverter to use as a backup for power outages. Wondered if I should use a regular 12v car battery for the source, or a deep cycle battery. It will probably do a lot of sitting between outages, so which would give me the most battery life overall?
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  #2  
Old 01-06-13, 12:43 PM
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More like a forklift battery to use as backup in a power failure. A car battery or any other battery type of that general size wouldn't provide power for long to a 2400 watt inverter if it was running anywhere near capacity. Or did you mean 240 watts?
 
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Old 01-06-13, 04:55 PM
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Nope, it's 2400 watts. Figured it would run the necessary appliances, mainly refrigerator and a light or 2. I guess if I keep it well under the max, my battery would last a bit longer. Forklift battery? Expensive?
 
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Old 01-06-13, 04:59 PM
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I dont think you will run the fridge with that. If so it will not be long. If the compressor even starts.

Why not just buy a generator?
 
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Old 01-06-13, 05:46 PM
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Forklift battery was humor. Cost of that battery would be about three times the cost of a 5000 watt generator.
 
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Old 01-06-13, 07:44 PM
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Power invertors are a funny thing. If you just bought that unit.......charge it and try it with fridge before you actually need to rely on it.
Not everything will run on one of them.
 
  #7  
Old 01-06-13, 08:06 PM
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Your 2400 watt inverter will draw more than 200 amps at full load. With just the fridge, figure maybe 50-70 amps.

The problem is your battery. They get expensive fast. A typical deep cycle marine battery is about 100 amp hour. That's about 1 1/2 hours continuous max run time for just the fridge, maybe 30 minutes full load, probably less. Never mind the start up surge for a motor.
 
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Old 01-07-13, 06:06 AM
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Off grid solar power systems do basically what you are trying to set up for your temporary use. Unfortunately they often have rooms or buildings just to house the batteries required to store a useful amount of energy. Aandpdan did some of the math for you and you can see you end up with some pretty big amperage numbers on the 12 volt side. Lead batteries are poor at releasing they power quickly so even a 200 amp hour battery would not be able to supply 200 amps to your inverter. If it did it might only do it once or twice before the battery is dead. Sadly there is a reason generators are still the most popular, efficient and inexpensive way to provide emergency power.
 

Last edited by Pilot Dane; 01-07-13 at 08:17 AM. Reason: can't spell "power"
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Old 01-07-13, 07:48 AM
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A standard deep cycle battery will only run my 1/2'' drill for a few minutes.
 
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