This one had a full system efficiency of 2.27/3.33 = 68%
I’m a little concerned how two 200W bulbs pulled only 330 watts, that’s typically not how bulbs work.
I’d want to see the power draw of those bulbs from a calibrated meter to be sure about that number.
For what it’s worth, I’m currently seeing 91% battery efficiency with my low effort setup:
I expect that to go up when I make better connections.
Then later I’ll test my inverter efficency.