Originally posted by Ian H
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Inverters are not very efficient. Allow 10-15% inefficiency loss. A 1000 watt piece of equipment would pull about 100amps from a battery at 12 volts. Depends also on cabling and resistence. So a typical start battery of 80amps would last about 20 minutes before its longevity will be harmed. A 100 amp agm would take 30 minutes and then approach the 50% limit most people abide by for battery longevity. If its a very rare occurrence then taking it down to 30% is possible with no long term damage. This is why we try and use 12 volts for all our camping equipment...tv,s, laptops, drills..etc.
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