Re: Measuring the real amount of AH available?
Allow me to chime in. I dont think the other realise your error here. You stated that you put a 1/2Amp load on the inverter. This could only mean a .5a load at 120v and not 12 volts so there is no way that would run for 400 hours. You are more likely discharging 5amp (not considering associate losses and efficiency of inveter) from the batteries. So if you are able to run for 15 hrs that would be 75Amp hours from the two batteries in parallel that should be ideally rated at 200Amp hr. So considering that they are used that is to shabby. If you go to 400hr that would have been 5A * 400hrs which is 2000Ah which is the factor of 10 that you are off by.
14KC130, 18 Sun-200, Xantrex prosine 1800, Sun 3024A, Apolo tsw4048, 1600Ah (24v) AGM, 1400 Ah(48v) AGM GNB, 1040Ah(12v) AGM GNB, classic 200, and 1 Tristar mppt 60 CC