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Install:
First, open a round holes of 54.5mm on the panel of the equipment. Then install the coulometer from the front of the panel. Finally tighten the bracket on the back.
QWORK Battery Monitor Voltmeter Ammeter with 13 ft Custom Cable
Product Overviews
This is a kind of high precision current type battery capacity tester(also known as coulometer)，which can test the voltage，current and capacity of battery to help users know the state of battery in time. It have memory function. It is suitable for mobile and portable equipments、e-bike、balance cars、cleaning machines、instruments、ups and so on.
- It is suitable for lithium batteries, lithium iron phosphate batteries, lead-acid batteries and nickel-metal hydride batteries which working voltage is from 8V to 100V.
Connect
- First, series connect the sampler to the negative circuit of your battery. B- of sampler connects to B- of battery. P- of sampler connects to P- of output or C- of charge.
- Then take a wire of 0.3-0.75 mm².One end of the wire connects to positive of battery，another end connects to B+ of sampler (any one is ok).
- Finally connect sampler to battery monitor by the shielded wire. After confirm and power on, it will be work normally.
Using steps
1. Connect and check the current
Power on after complete the connection as shown, the screen should display capacity percentage. If the screen has no response, please check the connection. Then charge or discharge the battery, and check whether the display current is equal to the actual current. If the deviation is large please check the connection.
2.Capacity reset
On first use, the percentage and capacity are not the actual value, you should reset the capacity: discharge the battery totally and hold the“V”key for 3 seconds to set the capacity zero or charge the battery fully and hold the “ %”key for 3 seconds to set the capacity full. And it doesn't need to do this again later, except replace the battery.
3.Check and reset the actual capacity
If you find the display capacity don't match the actual capacity，please check and reset the actual capacity：discharge the battery totally and hold the“V ”key for 3s to set the capacity zero，then set the capacity value as large as possible. Then charge the battery fully，and the display capacity is the actual capacity. Finally set the display capacity as preset capacity (Please refer to use and setting).
Use and setting
Attention
- When charging or discharging，the coulometer must be at work. Otherwise the capacity will not be accurate.
- When the charge or discharge current is less than backlight off current, coulometer enter a low power state and backlight off. And it can memory the capacity.
- Because of high sensitivity，when the coulometer is in standby mode (battery has no input or output current)，if it is interfered by electromagnetic radiation (open or close inductive loads，such as the motor) nearly，the backlight will shortly open.
- When the current changes frequently the date acquisition may produce error，and it will affect the accuracy.
- The tester cannot be exposed in the sun for a long time or in the environment with large amounts of ultraviolet radiation when using or storing，particular in winter (＜-20℃) and summer (>60℃) otherwise it will shorten the life of LCD.
Other description
- 2. Connect the load，when the discharge current is higher than backlight on current, the backlight on (if backlight blinking，the RS+ and RS- are inversely), and display discharge indicator ,indicate battery is discharging. (Picture 1)
- Break the load, and connect the charger. When the charge current is higher than backlight on current, backlight blinking (if backlight on，the RS+ and RS- are inversely), and display charge indicator ,indicate battery is charging. (Picture 2)
Ben
August 30, 2025
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.
R. Valencia
August 28, 2025
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 %.
Customer
August 20, 2025
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.
Joe H
August 12, 2025
Accurate
G Cat
August 11, 2025
Great replacement for LifePo4 upgrade for my Ryobi 480e mower. Easy install and instructions. Plenty YouTube videos for changeout
CKayaks
August 6, 2025
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.
CrispyChip
July 27, 2025
I got exactly what was pictured, and setup and installation was easy. The instructions weren't great, but it wasn't hard to figure out. I set my capacity (170 Ah), then fully charged the battery and reset the unit to 100%. Then the next day I used it until it was nearly dead (4%) and recharged it by plugging in. When it was fully charged it read 169.9 Ah that's 99.94% accuracy, which is good enough for me! I reset it to 100% again, and now it has always said 170.0 Ah when fully charged.The instructions say that it can read and monitor any current usage that's larger than what it takes to power its own backlight, so if you had absolutely no other usage on your battery, it sounds like the backlight will VERY slowly drain it without registering any usage. Same with other very tiny battery drains. That never applies to me because my inverter is always on and the 0.5 amps it takes while not powering anything is enough to make the meter notice the drain.So far it's been working great, and it's really nice to know my state of charge at any time.
kamil s
June 18, 2025
Using this to monitor my LifePO4 battery in my van that runs off a Renogy DC-DC charger. Shows all the info I need. Wiring help for anyone that's confused: Shunt B- goes to negative battery terminal. The P- side of the shunt is now your new negative terminal that everything gets plugged into whether it's a battery charger or an inverter etc. Nothing gets connected to the battery negative terminal anymore except the shunt. There are 2 B+ connections on the shunt, you can use either 1 of the 2 to run a thin wire that connects to the battery positive terminal (I used 16AWG). Then you just plug the screen connector in to the shunt and it will work. So now you wire all of your positive connections to the positive terminal on the battery as you normally would, and all your negative connections go to the shunt P- negative side. This way it monitors power going in (charger) and all power going out (inverter etc).
Richard Thompson
February 27, 2025
The media could not be loaded.
christophe
February 25, 2025
Brancher dans un camping car pour voir l'état des batteries.
Silverghost
January 30, 2025
Funciona bien.
Kunde
January 15, 2025
Preis- Leistungsverhältnis in Ordnung, gute Einbauanleitung. Funktion einwandfrei. Zu empfehlen.
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