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.

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

UPDATEBruce you are correct, no auto reset. I wish it did. I have Rich Solar DC Isolator, which will make it far easier to reset this power analyzer. Just turn off and back on. It will (or for me it really does) come in handy by killing the power and helps make other changes safely. I bought the 2 array version and it's here on Amazon if you want to look at it.{back to original review}First thing is to test continuity before anything else. Test Red and Black.After installing MC4 (or other connectors) retest continuity, before installing into your array lines.2 other things I did:1-Cut an additional 1/16 inch of the wire insulation where the metal connectors mount.2-Make sure the metal connectors fully insert into the MC4. The supplied wire is Very flexible and will bendand twist rather than going all the way into the MC4 housing. I fought that issue on all 6.The 2nd continuity test will reveal it's status. I had one that didn't pass the 2nd continuity test, and it would not come on when installed inline.It was the Black line, and I removed the MC4's on Black and replaced it more carefully and then it lit upand was functional.

Add some MC4 connectors and attached it to my solar panels and battery, worked like a charm. Clear and easy to read display, well made, plus they give you an extra one! :-)

The media could not be loaded.

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/B01NAN66N8Since 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.