I buy my microtek inverter 8 year ago and currently my inverter have no problem that running smothly no problem at all and this personnel experince and I would like to say these microtek inverter are fabolous and no overcharging problem and my inverter works on dual battery and there is no problem at all and I think microtek inverter are best and I suggest all of you if you buy dual battery inverter the go for microtek inverter and my dual battery inverter model number is 1400 EB and this model is best in class and this awesome because when product buy 8 year ago working smothly I think go for it friends this is my perssone opinion for you.