QWORK Battery Monitor Voltmeter Ammeter, Voltage Current Range 8V-80V, 0-100A Voltage Current Meter with 6.5 ft Custom Cable

Works well to verify and monitor battery capacity and operation; seeing that each bank carries its share of the load. The instruction sheet is tiny but setup is easy.

Installed on a EZGO 48V golf cart. Install was pretty straightforward. Drilled hole in dash for meter. Diagram was pretty easy to understand, but the initial setup instructions were a little tough. Looks like they used Google translate from Chinese to English. For those who left negative reviews saying the meter wasn't accurate, im curious if they didn't input the correct specs for their batteries. You have to input how many amp hours your batteries are and what voltage the batteries are considered dead in order for the meter to know when they are dead. The meter is very accurate but only if you input the correct battery specs. For example, my 160amp hour 48V batteries should remain above 42V under load or 46V idle. As soon as the meter registers the batteries are below 42V it will automatically jump the gauge to zero percent charge. Or once 160amp hours have been used it will show zero percent charge. Saw some reviews complaining about this. The next issue I had was after recharging the cart, the gauge wouldn't register that the batteries were charging. Turns out you have to move the Negative charger lead from the battery post, to the "P-" post of the shunt in order for the meter to register the batteries are charging.

Only one dislike. Unit did not come with a power wire and 1 amp fuse with fuse holder for protection. I had to go the auto parts store to get a fuse holder and fuse. Other than that it is a great tool to determine the state of charge of the battery and to see if the battery is charging or discharging. The price is very good for this accurate meter.

Purchased this for my travel trailer to have an accurate estimate of Ampere time 200ah lithium battery percentage. I needed the longer 13' cable because the battery and shunt are inside an exterior weatherproof battery box. Shunt appeared to be of a good quality material. Mounting the readout display inside my trailer was fairly easy by following existing conduit path inside the trailer. Reading the small text included with the mini-manual was difficult and needed to read the instructions a couple of times to get everything dialed in. I followed the instructions in the manual and depleted the battery (using a device similar to "MakerHawk Electronic Load Tester") to set my 0% baseline. I do this will all my new lithium batteries to make sure I'm not getting ripped off.I noticed a lot of youtube videos chose the alternate method easier method of setting up the display unit by charging the battery until full then setting the device to 100%, but I chose not to go that route because I wanted to make sure where my 0% would be so that I wouldn't be stuck with a dead battery while out boon-docking in my travel trailer. Now I feel confident that I can use the trailer to a low percentage without worry. I attached the mini-manual for those interested in seeing what is required to set this up.All in all, I'm very happy with this device and would recommend this to anyone in search of a cost effective battery shunt to estimate battery %.

Great gauge and shunt. A little drilling of control panel and fits great on the Ryobi 480ex to convert to LiFe4 batteries.

Installed in a camping trailer with a 100amp Renogy 12v battery. Did the settings per the (horribly written, obvious bad translation) instructions. The monitor kept showing a steady drop in the battery over the last two weeks even though 1) the battery was on a charger 2) there was no load on the battery other than this meter and a led light on the 7-pin connector that was in the circuit. Today, it showed 0% for the battery. Checking with a voltage meter, battery was at full charge. A total waste of money. Missed the return window as I was late installing it or would have sent this back.

The last state of charge meter I had estimated the SOC based on voltage. Lifepo4 batteries do not drop much in voltage until they are nearly dead. In other words the Soc and battery voltage is not linear. This shunt actually measures current going into and out of the battery. Even though this is the cheapest shunt on Amazon it is 100% accurate. That is I drew the battery down to zero and the shunt read zero. I then charged the battery up over night and the shunt read 100%. Very satisfied.

My unit is working great now. But after two wasted hours I realized that the poorly written installation instructions are also poorly drawn. As you can see in my attached photo the B-, or the battery negative side is to the left of the little Molex connector that goes to the display. BUT, on my unit, B- was actually on the right. The labels on the shunt aren't visible on my cart once the wires were on so I wasted a lot of time thinking the unit was bad. I installed it according to the "manual" drawing but should have installed it according to the B- and P- labels.1. If the shunt has P- going to the battery negative the meter will flosh constantly and read inaccurately.2. The shunt is directional and B- must be the only wire that is attached to the B-side.3. If the charger and every other negative load is attached to the P- side the unit will display accurately.4. It's easy to set up, but only if you glom instructions from reviewers or other forum websites. For Percentage charge your batteries to 100% then hold the percentage button (right). To enter AmpHours, know your battery bank amphour capacity then press the center button until it display AH and set your capacity.5. There isn't any website or phone number that I can find for technical support or warranty. So even though they state it has a one-year warranty, there isn't any place to send it.It is the easiest setup for an totalized amphour meter I've seen. I like it, now that I got it working.