Before sending the battery back I did try using a different inverter with the same charger hooked up at the same time to the battery and still had the same over voltage problem so I guess that narrowed it down to either the battery or the charger. As far as using disconnects for this setup...
I didn't run the inverter under any load for more than 10 minutes. After getting numerous high voltage alarms with the everything connected including the charger I was being very cautious and didn't want to risk frying something and voiding a warranty. Now I need to decide if I want to try a...
When the charger was done fully charging the battery the voltage measured 13.5 volts at the terminals and yes I tried just the inverter connected to the battery and it was fine, also just the charger connected to the battery was fine too.
I sent them numerous videos of my setup and videos of the problems I was having.
"I want to power a 12V input/120V output inverter supplying X loads with a 12V battery. I want to charge the battery with a separate AC-DC charger."
Is that correct? Yes it is
I am surprised that Ampere Time didn't say anything about the charging specs of the battery charger then. I gave them all the specs for the equipment that I was using for my system. FYI this setup is indoors so cold weather shouldn't be a factor for charging. Well I no longer have this battery...
I have a pellet stove that currently has my homemade battery backup system that is able to power the stove for roughly 4 hours or so if the power goes out (max draw from the stove is 300 watts). I am guessing you would call this setup a UPS... The current system has 2 6volt 200ah agm batteries...