Bought this for my generator battery as there is no electricity in the shed I store it in behind my house. It's been installed for about a month and the battery is holding a 13V charge. Before I plugged it in, the battery sat for about a month with no charger/maintenance device connected and drained to about 11V. This brought it in to 13V or two days and has held it there ever since. When I first checked the non-battery side of the solar panel, the voltmeter showed over 18 volts on a cloudy day (see image). Alarmed, I did a little research to find out why it was so big. It turned out that this is normal when it is in "open circuit" (disconnected from the battery) and the battery drops to 12V when connected. So if you check yours and see a reading of around 18-20V, that's normal if the battery isn't charging. So so far I'm very happy with it. I hope for many years of service from this and the battery.
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