DROKCharge-Discharge Multi Meter, 0-120V 100A DC Voltmeter Coulometer, Mobile Phone APP Control LCD Battery Monitor Volt Amp Temp Power Capacity Timing Monitor for RV, Boat, E-Bike

I bought this with low expectations. I was looking for an inexpensive alternative to Victron’s SmartShunt. This one seemed to fit the bill. Admittedly, it’s installation instructions were lacking and I had to look on YouTube to get me started. However, once I got it installed it’s has worked great. I have only been using it for about two weeks, so I will need to update this review if anything changes, but so far so good.I’m contemplating purchasing another one for my other solar system. One thing to remember is it is probably best to update the percent SOC after battery is charged to 100%.Plus:1. Accurate2. Strong Bluetooth signal, able to connect over 20 feet away.3. Easy basic to read screen4. Decent app that is also easy to readCons:1. Not hard, but not easy to install2. Need enough space to install the three components

This product worked great until I mishap broke the screen. Can I order just the display modual?

Function rich monitor that is relatively easy to install. Tasks the monitor performs should be explained more thoroughly. App adds to the effectiveness and usability of the monitor. Had trouble programing some aspects of the unit, can not get the display to time out.

The DROK Charge-Discharge Multi Tester, 0-120V 400A DC Voltmeter Coulometer, Battery Monitor, is just what I was looking for.

Version: 100A BluetoothOther than instructions that are a little hard to follow, this device works great. Simply install the shunt in-line with the battery (-) terminal, connect Vsens to battery (+), and connect the display cable. On the display, set the amp-hour rating of the battery and most features will work. It’ll take a couple of full-charge cycles to self-calibrate.Measurement comparison to my brand-name DMM show fairly good correlation, but calibration can be adjusted in the setup menu.The iOS App does a pretty good job of duplicating the display module wirelessly, seems to work up to 20 feet away (the measurement module should be mounted so it’s signal isn’t blocked by metal).Overall, the performance is great in the price range. It gives a good overall status of my off-grid power system’s battery state. It showed when I had a low solar output power that turned out to be leaves that collected on the panels.

I bought this to make my life easier when monitoring battery charge. I set it up according to instructions...which are challenging to figure out. Good luck finding online support.This unit does not measure battery level. It also does not monitor low output currents. 0.5-2 amps don't even register. You can set the battery capacity and the charge percentage, and it will stay like that forever.I want to like this unit, and the Bluetooth function is quite good. It reads voltage well, but current is itratic.I installed it without external power and without a relay. Maybe that would help, but the instructions don't explain much.

test new LI batteries for capacity. Worked great for that.

Used this for a 48v nominal / 60v max lifepo4 setup. It totalizes amp draw, and does update the fuel gauge accurately. Reverse and forward current are monitored and it can self power.The cons:It does not update the life remaining based on battery chemistry settings (there are none). So you must always manually set the fuel gauge. To fix this, they must offer an option to update the fuel gauge based on its own totalizer or on the voltage. This requires an additional configuration option for how-many-in-series and chemistry.There is also a bug with the time display after the unit has been on for a few weeks.Besides these two issues, the unit works fine and is easy to use.Update after a couple months of use:The unit's power meter has begun giving false and jumping readings for current, so is now useless. Reducing to one star review.