Matt3

Unless it was installed by a licensed elec the warranty is void anyways, usually... so may be no reason to wait to start unscrewing stuff. I just put in a 120Ah 25.6V Esener. So far the voltage seems to drop significantly lower under the same load than my previous 2x12V 44 Ah Blue Novas. Also getting over charge warnings from the cheapo Must 3kW inverter. Not sure what is to blame here. Float is at 26.6 and bulk 28.

SilverFox, is it the 1800-3024VPM you have? I have that and it doesnt behave as yours does. If grid is available it will always be on bypass while solar charges the battery. I'm on SOL mode now, but have tried UTI and SbU. For Setting 5 I've tried both LBU (solar goes to loads and then batteries if excess power) and BLU (solar priority to charge batteries). Both cases Utility should be last resort. Setting 20 is at 26.1V Setting 21 is at 27.2V (whats the default I don't feel like resetting right now?) Could this be the problem for me? Veronica there are definitely some settings you can change to help - although I feel some of these inverters have some bugs and you may have a dud. Some will reach float voltage and not continue charging. Some may behave like mine and not use solar on a sunny day when grid is available. Try changing setting 14 to USE, 17 to 28.6 and 18 to 26.7. This should be fine for LiFePO4 batts. If you battery capacity is 2.5kWh or below I'd recommend setting 11 to "25", and 13 to "20". This is charge current.