Yunsailing 2 Pcs High Precision Watt Meter Power Analyzer Battery Consumption Performance Monitor with Backlight Digital LCD Screen(9000)

I got these to monitor power levels and usage for portable radio gear. The wires are sized nicely for 40a Anderson PowerPole type connectors, and the two gave acceptably similar readings when hooked in series. For temporary hookups, these work well. They're well marked and it's easy to tell which is the input and which is the output. Overall, they're a solid choice and a good value.

These do just what they say - don't be without this kind of readout if you're setting up or monitoring a solar power system! I mounted solar connectors on each side and can insert these meters inline easily. Great for measuring power in and power out of a buck converter. My only minor complaint is that when solar panels are starting to gradually produce power early in the morning as the sky is just getting light, these meters tend to not boot up cleanly and while the background is lit they never display any data, just a line of black rectangles - so if you expect to have one of these readouts inline permanently to constantly monitor power, prepare reset it manually or just supply it with external power.

I felt compelled to write a review because there wasn't one at the time I purchased this pair of analyzers. I saw on Amazon that there were several analyzers like these for sale by various sellers and they all looked alike to me - the main difference being whether you needed/wanted 150 A or 200 A limit. I wanted one to connect to solar panels to monitor energy production and troubleshoot low/zero-producing microinverters, and decided on this pair of analyzers because, at least at the time, it had the best unit price ($21.99 for two) - furthermore, having a second one is nice for comparing solar panels. Firstly, be aware that they do not come with any connectors, just 6-cm long cables sticking out, with 4 mm of each end stripped off. One reason for my not rating these analyzers 5-stars is because it was not easy attaching mc4 connectors to them. Let me emphasize that from the info/reviews of the other analyzers like these, their cables were all only 6-cm long. Therefore, this criticism would apply to all of them except the considerably more expensive analyzer that already had mc4's connected to it. I would like for the cables to either have been 8-cm long or stiffer. Luckily though, I discoverable my Craftsman 1/8", 6" long screwdriver could be slid in behind the metal terminal of the mc4 to snap it in place without a lot of trouble. Next, the analyzer can run off the solar panel energy without an auxiliary battery as long as the solar panel voltage does not go below about 4.8 V. Once it does, the analyzer stops (fully) functioning. (Something will still appear on the screen until there's no voltage at all, but it is not what should appear.) This leads to my other reason why I am not rating these analyzers (and, maybe all the others being sold as well) 5-stars: they don't come back to "life" once the source voltage (from the solar panels) increases to about 4.8 V. I found that I had to disconnect them, wait for the analyzer to fully shut off, and then reconnect them. Well, the better alternative was to use an auxiliary battery, for which there is a connection on its side (with polarity symbols on the back of the analyzer). Finding what to buy was a challenge. I think I checked all the analyzers like these being sold, with only one of them saying from what site to go to buy their connectors with wires connected - but without a battery holder. I was going to buy these connectors with wires only, but thought I should first check on battery holders. This is when I found: "4 Cell AA Battery Holder W/JR Style Connector Receiver Battery Pack - 5 Pack - Apex RC Products #2931" Its URL is: https://www.amazon.com/dp/B01NAN66N8 Since it was so inexpensive (a 5 pack for only $9.99) and "Free Returns", I purchased them to try, and found that if I slightly bent the three pins on the analyzer inwards, I could slide on the "JR Style Connector", and it works! - in fact, I've been using the auxiliary battery pack for a couple of weeks now, and it has been working properly. Lastly, I want to share that, even though they are not waterproof, during the couple of weeks I have been using one of them, it has rained, but it has not failed. It is mostly shielded from rain by the solar panel, but nonetheless, what happened one day was that condensation formed on the lower, left side of the inside of the clear plastic covering the screen, making it difficult to read what was under the condensation, but, after the weather cleared that day, so did the screen.

work great with my panels and solar generators. good price

Given the low price, I'll live with the issues, since I don't need high accuracy. First off, the manual states, "Peak Amps value (AP) display is the maximum current drawn from LOAD side since meter's startup." Nope. It resets just like the other items, for each display cycle. Compared to my Fluke meter, the voltage measurement is accurate. I haven't checked the current display, but I'll accept other reviewers judgement on that. I haven't yet tried to check amp-hours. And, finally, when connected to an auxiliary power source, with no source and load, I expect the display to show zero for all items, but it doesn't. It's wobbling from 0.10A to 0.12A, switching among 0.24V, 0.26V, and 0.28V, showing 0.05Ap (doesn't match the A reading), and the Vm is 0.22. The Ap is wandering around, and the Vm, with it sitting on my desk - nothing attached other than aux power. The AH is steadily increasing, though it's a very low value - 0.028 right now. So, it sure makes me wonder what it'll be including in the values once I have it measuring solar panel charging and battery drain when I'm using for amateur radio. In the end, I mostly care about voltage and current at a point in time, and only a rough number for AH so I know when I'm getting close to being at low charge on a battery, but you'd think that reading zero would be easy to get right. For the auxiliary power port, the JR connector on these is a perfect fit, polarity correct - if you plug it in the right way. I'm going to plug the unused opening, just to avoid any issue, though I might assume the unused pin is also unconnected to the circuit board. https://www.amazon.com/dp/B08H56LGWF - OliYin 10pcs JR Futaba Male Servo Connector Plug to JST Female Adapter Cable 22awg 10cm Silicone Wire for RC Lipo Battery The wires are a little big for the 12GA Anderson Powerpole connectors, but clipping some strands fixes that easily enough. It would've been nice to have another inch or so of wire length though. Update: One of the two has failed, after a bit less than 2 years. Not suprising, I guess. Given the low price, compared to what is likely the same item from Powerwerx, a regular replacement cycle is what we live with.

The meter did not go to zero with no load connected. Measurements are inaccurate. I tried to contact them repeatedly, but NO customer support. Waited for a response, but nothing, and now the return time window is over. Defective product and no resolution.

Work as intended, carry one with my battery to monitor while operating my radios away from home. It's a great tool to just have. I also had one setup on my solar bank to monitor the state of that as well

Muy útil en operaciones de campo de RadioAficionado, ayuda a monitorear el consumo y la calidad de la energía.