They work great! I use them to monitor 2 sets of solar panels running at around 18vdc with a 12-14vdc load depending on the sun. They turn on at about 5VDC. And at the push of a button you can see the percentage of power the panels are putting out, these are 12V DC panels, very accurately. I hope they keep working, we'll see in time. So far very happy with them.
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