Whereas the buck converter might be crappy in some aspects it definitely does the job even at moderate loads. For some reason the current fluctuation is much greater when the dc voltage is over 12.1v. This is when the ac volts drop under 110v and eventually leads to my power cord cutting out momentarily. When I keep the voltage at 11.8VDC then my current is much more steady. Voltage under moderate load only drops to 11.7VDC but keeps 120VAC.
I’m supposed to get a voltage meter so I can solder it onto the dc side by the bms but I have yet to receive that. The meter will turn on when I turn the inverter on so it doesn’t constantly drain the battery. This will hopefully give me a good idea of how much juice I have left in the cells rather than guessing.