Reply by PutnamEco

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Posted on Cordless Electric Chainsaw

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155 posts in 3283 days

#1 posted 09-21-2011 06:14 PM

I would go to a larger inverter if your going to be running power tools, 3000 watts would not be unrealistic. Undersize an inverter and you stand the chance of burning out the tools you hook up to it. most power tools like circular saws and chainsaws can draw a healthy amount of current when they are under a load, especially if there is any binding going on, not to mention the draw they take when they first start,

Sine wave is referring to the way the current alternates. What you get out of the wall sockets is referred to as a pure sine wave, meaning it has a nice smooth transition when switching poles. A modified sine wave does the transition in a number of steps rather than a smooth transition. A square wave inverter switches the poles abruptly, with nothing to buffer the change. A modified (or square) sine wave inverter can cause problems with things other than simple motors and incandescent lights. If all you will be using it for are power tools WITHOUT variable speed controls it should be fine. Most of my variable speed tools work with a modified wave, I did have a router that the speed surged when I ran it at anything other than full speed. YMMV. A lot of electronics do NOT like modified (or square) sine waves, especially from some of the cheaper inverters, who only spec a single step into their “waves”. Some florescent lights may even balk at running on them having a hard time starting and humming a lot after they do.You should probably forget about listening to most radios or TVs (hum) from them as well. Wall wart power supplied things are usually not affected by them though.

-- “The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little.” ― Franklin D. Roosevelt

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