Bought this unit for some peace of mind as living in Northern California where power outages and wildfires are frequent, this unit worked perfectly. I tested it by hooking up a deep cycle marine battery with 2/0 weld leads and it ran an old stock fridge for almost 4 hours with no issues. The device didn't feel warm and the internal fan was very quiet. The fridge worked perfectly, the compressor turned on and off without any problems. I hope I never have to use it, but I'm glad I have it just in case.
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