look for the solex power inverter and you don't need anything else, like me...https://www.solaxpower.com/homeowners/
David I did not see any off grid operation from solarx.
Thats nice if you happen to have a power wall installed.
Get in contact with them and they will explain it to you, mine works perfect so they have it! Kind regards
Today I mowed my grass using the MPP Solar water pump batteryless inverter. It works fine for running motors. The AC waveform is terrible and after running it through a 220 to 110 transformer the Tesla Model 3 will not accept the AC signal. So what I have decided to do is add a 3 phase motor from this source https://www.automationdirect.com/selectors/motors and get a car alternator belt driven which charges a 12 volt battery. Then use a pure sine wave inverter to generate up to 1500 watts power at 120 VAC. It sounds like a lot of junk connected together but it does get the power into the battery for $250 for solar inverter + $186 for the motor + $100 for car alternator + $150 12 VC battery + $200 pure sine wave inverter = $900 total which is not a bad price. I will use a voltage sensitive switch monitoring the 12 volt battery voltage so that when it charges to 13.8 volts the inverter switches on and when it drops to 12 volts it switches the car off. By messing with the Model 3 charge amps setting it at 12 11 10 9 8 7 6 or 5 amps I can find a compromise on minimizing the amount of work the 12 volt battery does. I.e. the sunlight should go straight from panels to car with not that much charging. Maybe I can add the computer control to the J1772 plug so that the battery remains essentially floating nearly fully charged while the energy goes straight into the car. So I will start working on that plan. Of course all this should be possible with a single electronic box that has yet to be invented (engineered).
Yes you are absolutely right about the losses. Looking at the details it looks terribly inefficient. Also the 12 VDC car alternator isn't designed for continuous duty at a high amperage charge rate. So scratch the motor driving a generator idea. The pure sine wave inverter going from 12 VDC to 120 VAC is also inefficient.
That is pretty sweet. I'd still say its probably a good idea to have a battery bank that can take up the time delay between switching settings. Doesn't have to be huge capacity but certainly able to handle the full inverter load for 5-10 min.
