DROK DC Power Meter, 8-100V 100A Volt Amp Watt Meter, LCD Display Multimeter Voltage Current Energy RV Battery Monitor Voltmeter Ammeter Wattmeter with 100A Battery Shunt

So I bought this as an indicator for a 24 volt solar power system built into a tote. I found that it worked very well although as others have mentioned, it needs some sort of enclosure so I designed and 3D printed a suitable housing for the shunt. This worked great for me. One thing to keep in mind is that the quality of the wire connections to the shunt and the battery are really critical as far as accuracy. The shunt itself is only a few milliohms of resistance and the voltage drop across that is very small, so the slightest bit of extra resistance introduced by a substandard connection on one of the wires will completely throw the readings off. Use really good quality crimp ons and then solder the wires after they're crimped. If you do that and follow the installation instructions to the letter, there shouldn't be any issues with accuracy. I don't know about longevity at this point but for the price this is a really good meter.

Added a 12v RV AC unit and wanted to monitor the amp draw. What a simple and great monitor. Easy to wire and use for battery draw tracking.

I've got a few of these in my go boxes and RV. I love that they are simple, basic and just work. I also love that they have a watt hour use meter that can be reset to count again. A feature all shunts should have, but most don't. It's fairly accurate when measured against my Fluke 289 but off a few 10s of mV. It has higher resolution at 10mV and 10mA than most shunts. I wish it had "bi directional" readings so could read charge and discharge and I wish the shunt itself had holes in it to better mount. Lastly the 50A version is no longer available, but great for smaller installs. But even with the small draw backs this is a great shunt for the money. If you are wanting bi directional or SOC (which is never really accurate anyway) this may not be the shunt for you.

This meter does a good job for my purpose. I bought it to monitor the charging voltage and current for my ebike. You must hookup the wires per the instructions or you will not get a correct reading. I experimented with the hook up to see what would happen and it makes a difference. This meter does not actually monitor the current directly. It measures the voltage drop across the shunt and it is important that the shunt is the last part of the circuit per the instructions. I 3D printed a case to contain all of the wiring and it turned out to be a good tool for my needs.

I bought this to measure the power generated by my solar power system for my workshop. It works very well and appears to be very accurate, not only with voltage, but also with power generated, Amp, and watts. I used a clamp on ammeter to verify the current reading and also the voltage. I found the discrepancy between the readings to be minor. I’m happy and I think this is a good product. I’ve had it operating for around 6 months or more now.

I initially wired it to give me the shorted circuit amps from a 100 watt solar panel. To read this I used a 9v battery to power the meter. Worked fine and cost way less than a DC Ampmeter. Then I rewired the assembly to then read the solar voltage,current and power charging my boat battery while it's in a slip. If the bilge pump becomes active due to water intrusion, I will see a high reading for Watt Hours accumulate when a check it a week later. The Whrs can be reset to zero.

I decided to write this review because this has happened twice. I purchased the 20A and 100A version and they both have failed in the same way. I have this (100A version) measuring the input from my solar panels (0-60v, 0-60A). It worked great at first, but then just as the 20A version did, after a little while, I noticed the cumulative power (kWh) started resetting. Every other day it would reset on its own. Then I noticed that the voltage seemed to be higher than it should be, so I checked it with a reliable multimeter and sure enough, it slowly (over a few days) kept increasing it's voltage measurement. This also affected the power measurement. At the same time I had the backlight on, and it started to be really hard to see the screen. So I turned the backlight off and that fixed the unreadable screen for a day or so. Then the backlight came back on all by itself, then off, then back on, etc... Then it started flashing. The flashing might have also been because it was detecting a (false) high voltage and so it gave its alarm (which is flashing the screen). Now anytime I look at it it is either completely off, shows all "8"s on the screen, flashes, or shows unreliable data. It's kind of like a game now to see what it's going to be showing when I go look at it. Maybe it is possible that the slowly rising and falling voltages from my solar panels in the morning and evening erase/manipulate its program, but if so, that's a weak design. I wouldn't recommend this for any critical application.

I bought two for use on a solar panel system on an off-grid storage building to monitor both solar panel operation and battery power use. They arrived in good shape and were easy to add to my wiring panel with a couple of modified plastic 1 gang outlet boxes. I bought the 100A version but, in hind-sight, the 50A version probably would have been a better fit. What I received worked just fine, but the 100A shunt is relatively massive and I had to find some suitably large crimp on ring terminals (I ended up using 5/16") to accommodate the bolts on either end. They are probably over-kill for a simple application like mine, but they were inexpensive and will satisfy my desire to know how things are working. EDIT: Two days later, one meter is displaying incorrect values (roughly 50% higher than true). I am waiting on correspondence with the seller on how to proceed. EDIT: Follow up. The vendor provided information on how to recalibrate the device, but it required a 20v power source which I do not have. I am returning the bad unit & ordering another for replacement. EDIT: Resolution. The vendor was very helpful and has covered the replacement of the meter. I am happy with the service provided.

c'est mon 3 ou 4ième que je commande et maintenant que le bouton est plus facilement accessible, c'est super.. moi aussi (comme un autre a mentionné) j'aimerais qu'il puisse lire le courant dans les 2 sens (avis aux conepteurs!).. pour ma part, je n'utilise jamais le "Shunt" de 100 amp mais toujours celui de 50 amp (via un autre fabricant si non disponible dans cette version sur Drok) car le "'Shunt" 50 amp est monté sur un support isolant, ce qui est bien plus facile à monter sur un boitier métallique.. dans le menu, après "Clr" en tenant le bouton enfoncé vous verrez "Cur" (pour le courant) qui est configurable 50 ou 100 amp.. mes unités vont toutes bien et la calibration voltage/current est bien précise..

Il n y a pas de support . Le moniteur va très bien ,mais ça serait très utile du avoir juste un petit suport pour l accrocher car on n a pas toujours d endroit pour l incerer

It works!

fait le travail description exact bon produit