600w inverter...whats it good for?

Well, it's a 640w continuous rated, mod square wave inverter. You can run anything on it. Some motors will hum, and very rarely, some delicate electronics might be screwed up.

But for the most part, you can use it for just about anything.

Does the fridge use 12v and have a converter that it uses when plugged into 120v? If it does, it'll probably be slightly more efficient in terms of watts consumed to just run it straight to 12v rather than doing the 12v -> 120v -> 12v thing.

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What do I use the inverter for? 1) watch TV underway or on the hook (120V Tvs are cheaper, larger and better than the 12V jobs) 2) run the blender for Margaritas, 3) Use of power tools 4) Use of a small microwave oven to heat up something 5) charge phones, tablets and laptops, 6) had a Watt unit and used it to run a refrigerator for 5-6 hours. 7) ran a box fan in the cockpit when the wind dies and the air became hot and heavy. A 600W inverter need to be fused and hardwired to the batteries, no 12V sockets and plugs. It needs to be placed as close to the batteries as possible and in a well ventilated area. Many in that class offer 2 or 3 15A sockets so you can use extension cords instead of hard wiring to the boat's 120V distribution panel. You could install such a unit for around $30. Two 18 inch gauge #6 automotive battery cables, one fuse holder and fuse. Would not do without an inverter.

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