Review on 🔌 DROK Digital Multimeter DC Power Monitor, 6.5-100V 20A Voltage Amperage Power Energy Meter with Built-in Shunt, LCD Digital Display Volt Amp Tester Gauge by Riley Skeet

UPDATE: After observing the solar panel for about a month I decided to update my wiring to use the output side of my charge controller and not the line from the solar panel to steer . When I went to remove this from the circuit I was surprised to see that the stored energy field read 238Wh when it last read 1058Wh. It had to stay in the 4-digit Wh range or switch to kWh displays at most. There was no way my 15-watt panel could generate the roughly 9,998 kWh needed to rotate the display. Mine doesn't show the right voltage either. The 12V DC power pack connected to the mains shows approx. 19 V, the multimeter shows 12 V on the output side. When new, the display was very accurate. I still like this gauge, but obviously something is wrong with mine. It's a pretty nice tool - my rating is probably closer to 4.5 stars, excellent but not quite perfect. The screen is very legible even in daylight and uses very little power - my 15 watt solar panel glows at the advertised open circuit voltage of 13 watts under neon lights. For me the killer feature is the energy rating (watt-hours) and the fact that it has memory and keeps that value even in the event of a power outage, which is important for my use in monitoring the net output of my solar panels. There are a few complaints - the cable connectors are fairly small, and while they accept 16ga cables, my 15W panel uses small pan head screws that are difficult to tighten. A molex socket would be much safer. The only thing I would like is a "factory" option - it's a pre-assembled design box for it. I bought one that fits fairly well, but I had to make my own cutout in the lid, tap and seal the line, and load holes. I plan to use it between the solar panel and the charge controller to see how much my panel is actually charging. leads. This is a nominal 15W panel and in theory I believe that even with an average daily consumption of 5W I should get around 50Wh at worst. For a panel exposed to direct sunlight, I *need* to add 250Wh or 20Ah to my 12V battery if I don't use it for 5 days, but last summer the battery stopped holding a full charge. This monitor shows you if the battery is overloaded or if the panel is not delivering any significant performance. I noticed that this vendor also sells battery monitors and I can add one of these and another on the load side of my battery to find out my current draw. Maybe I'm just using more power than my alternator and solar panel can return. If the vendor ever gets into more complex products, adding a network for remote monitoring would be great.