When we bought a new boat, it came with a Wagan Tech Pro line 3000. Which is a modified sine wave inverter
. I had a lot of concerns in the beginning after reading all the forums
about modified sine wave inverters causing problems. I had actually planned to replace the unit with a sign wave inverter
. The Wagan unit costs about $350 and a true sine wave unit would have been 2-4X the cost to replace it. I have to say, my apprehensions were totally unfounded. after 2 years of use, we have had absolutely no problems using this modified sine wave inverter with everything. We use it with computers
, microwave, power tools, shop vac, air compressor
, whatever and have never noticed anything overheating
or behaving other than normal.
I'm convinced that not all manufacturers of modified sine wave inverters are equal so your mileage may vary with other makes/models. We have been very happy with the Wagan unit and see no reason to replace it with a true sine wave inverter at this juncture. The Wagan 3000 can peak to 6000 watts for short periods to handle inductive loads from motors etc.