I have the 6500ex and it has been flawless I lvoe the thing except for 1 thing, on my aims 6kw there is a low v cutoff and a restore volt, soi for exampole when i hit 42 it will cut off my inverter and not cut it back on until i hit 44, thius is to prevent the unit from coming on and the rubber band from dropping it back below the low v cut off and turning back off, I have yet to find this setting on my eg4, my eg4 will cut off at 46v but in the morning as soon as the solar starts and brings the volts back above 46 it turns on then drops the voltage below and cuts back off, at that point it wont turn back on unless i manually turn it off and on, this has to happen evey morning and is quite frustrating.