OP,
You seem to have done a lot of work on this.
A question for you.
The 8.0 ATS inverter specifications (on the amazon link) say that the efficiency is 90%.
Can you explain what this means?
Basically means your losing 10% of your energy output....usually caused by heat and internal components. So putting 100% in you lose 10%.... A pc power supply is 85-95% efficient so that 10% is not a big deal.