Whilst I wish the guides, tips or instructions were a bit more helpful I found this converter absolutely perfect for my needs (after figuring it all out). It accommodates three 120V circuits (one needed for the 12V system and one for the main line). I connected it to power two 12v fuse boxes (each with about 6 items like lights or usb sockets) but it can power four 12v circuits. You will need your own fuses for the 4 circuits. I think it can support two batteries, but I connected it to an H8 deep cycle marine battery. It charges the battery when running on 120V (as mentioned, it doesn't convert 12V to 120V). Otherwise everything seems very well designed and thought out. This is a quality product. If you know anything about electrical circuits, you can install it. I would recommend for this type of applications.
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