Small AC motors and Inverters
Disappointed that my ancient Mod Sine Wave inverter (140W cont, 200W surge) shuts down with a 120W coffee grinder. Works ok with the 400W (cont) MSW inverter built-into the truck, though a little ...
Forum Discussion
2oldman wrote:
From Wikipedia:
Sine wave inverters with more than three steps in the wave output are more complex and have significantly higher cost than a modified sine wave, with only three steps, or square wave, (one step), types of the same power handling. Switch-mode power supply (SMPS) devices, such as personal computers or DVD players, function on quality modified sine wave power. AC motors directly operated on non-sinusoidal power may produce extra heat, may have different speed-torque characteristics, or may produce more audible noise than when running on sinusoidal power.
From me:
Surge wattage can be up to 4 to 5x running wattage.
Ok, maybe 800-1000W surge for the coffee grinder. That's probably what the truck's 400W continuous puts out. Then there's the ~200Whand blender ... and going to pure sine wave ... not cheap.
BFL: the 12V socket is one I wired myself with rel. heavy wire and 10A (?not sure) fuse in the WFCO. Only about 1' from WFCO. Still, if the surge is 1000W at 13V, that's 76A. But the fuse didn't blow; maybe slower response than the old inverter's overload circuit?
Guess it would be best to get a pure sign wave inverter and wire it close to the batteries. For a coffee grinder? sheesh ...
