BFL13 wrote:
Got lost here. How do you put a load on the inverter to knock down the battery voltage below the inverter's high voltage cut-off once the inverter quits at high voltage?
I had that problem with solar (I was on panel-direct at the time--controller had fried) getting voltage too high for the inverter (15v on mine) and ISTR I had to run the furnace--in August!--for a few minutes. Got the furnace to turn on by maxing the temp slider to the top.
When the inverter faults, I shut it off with its power switch which is the procedure for clearing this fault. Then I cut the panels off from the controller via the circuit breaker I have installed between them. The battery voltage will quickly drop to a level where I can turn the inverter back on again. Then I can load up the inverter with whatever AC power devices I want which drops the battery voltage even further. Then I can flip the breaker back on to connect the panels to the controller and they contribute to the DC supply to the inverter. If I take off AC loads, the battery voltage will have an opportunity to rise again which it does gradually.
Currently, it can rise right up to the bulk/absorption setpoint (14.40V right now) and the inverter will not fault. But if I have a small load on the inverter while it is right at the setpoint and I unplug that load, the voltage will have the opportunity to do a quick spike before the controller brings it back down to 14.40V again. That quick spike is enough to fault the inverter again on high voltage.
