Is Modified Sine Wave Inverter Appropriate for Micrwave, TV, Fridge, and Laptop
Updated 02/10/2026 | Published 01/27/2026
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Question:
Im wanting to install a 5500 watt modified sign wave inverter in our fithwheel. First, is a modified sign wave ok to power microwave, TV, frig and even a lap top for loads? we have only 1 solar panel not sure of wattage, and 2 lead acid batteries. Do yall have any wiring diagrams, wire sizes needed etc for this type of install? Thankyou so very much. Corey
asked by: Corey B
Expert Reply:
Hey Corey! A modified sine wave inverter would not be the best option for your setup. The laptop would probably be the least likely to have problems since it will have its own charger/adapter that converts back to DC. The electronics on your microwave, fridge, and TV might run extra hot, could hum and make noise, and may wear out prematurely if you're using it frequently.
Also, with a single solar panel and 2 lead acid batteries a 5,500 watt inverter is quite large. I'm guessing those aren't big batteries either, probably 100-200 Ah batteries. Unless you significantly increase your battery bank size and add some more solar panels the large inverter isn't necessary. Something smaller like the Go Power Advanced Pure Sine Wave Inverter - 12V - 3,000 Watt # GP82QR or 2,000 Watt # GP72QR would be more appropriate.
The instructions for the # 34275013 you were looking at are attached further down on this page. You can look through them to get an idea on the wiring. However, you will want to follow the wiring diagrams for whichever inverter or inverter/charger you decide to purchase. There is no universal setup and different manufacturers have different requirements for things like fuses and wire gauge.
Are you trying to run things off grid with your solar setup? If you are, it would be a good idea to use a solar calculator to figure out what you need. Ours is linked below if you want to check that out as well.
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Robin H.
2/10/2026
Hey Corey, how did things go with choosing between the 2,000- and 3,000-watt Go Power pure sine wave inverters for your fifth wheel? Your update could make it easier for others trying to size their inverter and solar setup.