Quote:It means it should put out a maximum of 125 amps for an hour. If you use all of the 1KW from the inverter this should be around 4 amps output if my calculations are correct (1000 watts / 240 volts = 4.16 amps). Which means your battery should last about 30 hours (125AH / 4 amps = 31.25). However this is seldom the case as there is a degree of redundancy involved so it's best to take off about 30%. Therefore your 125AH battery is really about 87.5AH (87.5AH / 4 amps = 21.875), so in reality it should last about 20 hours. One thing though is you shouldn't really completely discharge to battery and it should not be allowed to go down below about 30% before recharging, so taking taking that 30% off as well we have - 61.25AH / 4 amps = 15.31 hours, so you will need to recharge the battery after about 15 hours use at a maximum of 1 KW (4 amps).
LAC, your intentions are good but the calculation is way out. If you use 1kW power on a single 12v 125ah battery, you're looking at a very short time indeed.
Firstly, it's 1kW/12v =
83 amps! Not only will you have to use massive cables to carry the ampage (you could just get away with 16.0mm, depending, but I'd use 25.0mm personally).
Secondly, using 1kW, I reckon the battery would last you 3 mins max before you start endangering it's DOD life span.
Quite right, these batteries are designed for slow discharge and not an abrupt drain from huge loads.
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