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Captden--Do you have enough instrumentation on the genset to read voltage and amps output when trying to charge with the inverter and with other loads. Before you toss out the Xantrex, maybe you could check the genset output to see what amperage and voltage it is capable of putting out.
If your genset was reading 40 amps AC at 120v, or about 5 kw output when the charger is putting out 50 amps DC at 13v or about 0.65 kw, you would get a significant improvement from a better inverter/charger. If the genset is only reading say 10 amps, is it still capable of 40 amps or better if you put other loads on it?
Its not an exact science, and sometimes the problem is the instrumentation and waveform wierdness. I used one system where the Mastervolt inverter/charger would cause an 8kw genset voltage to sag to an indicated 98v with a 20 amp current, when the same genset would put out over 30 amps to other loads at 110v.
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