I need a generator to run power tools at the camp I’m building. What size generator do I need?
A. Generator size is measured in watts. To determine the number of watts needed, remember that starting watts is 3 to 5 times greater than running watts. So, add the amps listed on each tool you’re going to run at the same time, multiply amps x volts x 3. That will equal the wattage needed on the generator. Example: Circular saw 12.5amps, 3/8″ drill motor 3.5 amps, 1hp electric-air compressor 12.3 amps. Total amps needed 28.3 x 110v = 3113 running watts x 3 = 9339 watts. The largest portable generator that we carry is 6200 watts so you would have to run the circular saw at a different time than the air compressor or you run the risk of damaging your tool.
