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@2airishuman splash lube compressors can typically go down to about 2/3's of nameplate RPM before it's an issue. The Junior is spec'd to run between 1500 and 2300rpm depending on power availability. 1500 for 2hp 110v motor, 2100 for 3hp 220v motors, and 2300 for the 6hp gas motor.
The big issue I have with trying to run off of the 12vdc system is how horrible inefficient it is going to be as I laid out above. Total efficiency of the system is around 50% by the time you take 12vdc to 110vac, then run the single phase motor.
If you can run it straight off of vdc then you are at 90% efficiency, but finding a 2hp 12vdc motor is going to be hard, if not impossible. I reached out to my motor supplier for work and they said they did not have any motors from any of their suppliers in 12vdc greater than 1hp. Even if you found one, it's going to pull around 150a, so you have to keep it really close to the battery packs and run with some serious wiring.
If you have a higher voltage system, much easier, if you have a big inverter already and can deal with the inefficiency, not an issue, but when we are talking about solar systems, the difference between 50% and 90% efficiency is substantial.
The big issue I have with trying to run off of the 12vdc system is how horrible inefficient it is going to be as I laid out above. Total efficiency of the system is around 50% by the time you take 12vdc to 110vac, then run the single phase motor.
If you can run it straight off of vdc then you are at 90% efficiency, but finding a 2hp 12vdc motor is going to be hard, if not impossible. I reached out to my motor supplier for work and they said they did not have any motors from any of their suppliers in 12vdc greater than 1hp. Even if you found one, it's going to pull around 150a, so you have to keep it really close to the battery packs and run with some serious wiring.
If you have a higher voltage system, much easier, if you have a big inverter already and can deal with the inefficiency, not an issue, but when we are talking about solar systems, the difference between 50% and 90% efficiency is substantial.