Just add oil and gasoline, start it up, and you're good!

Works great on propane. Very low noise and operates my 15K RV AC with no issue!

Heavy duty, worked great, this thing is built like a tank!!
I liked the simplicity of the switch and the reasonable price I paid for it.
The switch box and internal components seem to be made well, with decent materials.
Works as expected with plenty of room inside for wire bending.

This ATS is in a well made box with good connections and a quality soldering job. It has a simple Puqele P30F JQX-30F relay that releases the solenoid tension when the power goes off the control circuit allowing the spring to flip the unit to backup. This is a very failsafe design. The problem is the gap between the two pairs of contacts is not great enough to eliminate a quick arcing as the power comes back on the control circuit. The chance the two circuits will be in phase is slim and about 1/4 chance they will be near complete opposites allowing an arc of 240 volts. This might be okay for some simple loads but will cause a problem for high induction loads.

The ends of my wires were pre-tinned in an unprofessional manner. It made me wonder if the unit was returned already.

Bought two panels April 2025, performance is very high. Just as stated in the specs. In direct sun the wattage hits 400 watts easily. Even on a cloudy rainy day each panel will sometimes generate about 50 watts, that's because of the design of the panel that tolerates some shade. The price on tugapower.net is very reasonable considering that it takes the place of four 100 watt panels.