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Why Choose MNJ Motor DC Multifunction Battery Monitor Meter ?
9 in 1 Battery Monitor Meter
1 interface displays 9 kinds of measurement parameters at the same time.
100A Current Shunt
It comes with a 100A/75mV current shunt, suitable for large range measurement. (NOTE: Do not hold or touch the shunt when in use.)
High Precision Chip Control
Accurate measurement , efficient and stable operation, safe and reliable welding process, measurement accuracy reaches 1%.
Lifetime Customer Support
We stand behind our products all the time, 30 days Return/ Replacement, 24-month Relieved Services, Within 4 Hours Friendly Response
Joe Smith
Reviewed in the United States on February 7, 2025
Would be 5 stars, but two things: it is 5/16 which is annoying because most things around the 100A level are 1/4, and only 2 of the included wires have ring terminals and are comically, I mean laughably, short. Like come on guys, what 100A power system has positive and negative terminals within 6 inches of each other that don't need ring terminals? Change the red/black battery terminal wires to 36 inch and at least throw the ring terminals in the box.
Customer
Reviewed in Canada on March 10, 2024
Commandé un avec support pour le shunt , j ai retourné celui-ci.
jeffw
Reviewed in the United States on December 7, 2024
This was easy to install and provides much better information than the simple 4 dot battery level on our camper.
nice/ice
Reviewed in the United States on December 21, 2024
Works as it should. Came quickly. Only thing the directions are a little difficult, but for the price not a problem.
ah
Reviewed in Australia on November 18, 2024
quality
S. G.
Reviewed in the United States on August 7, 2023
I am using it for a dingy with 55 lb trolling motor and a 50 Ah LiFePo4 battery, and it is perfect for this role.1. all info you need on one screen - voltage, current, Ah/Wh, remailing capacity. Having battery internal resistance and load resistance computed is also very useful.2. it memorizes accumulated values (Ah/Wh) when powered off - no need to use an optional backup source. You manually reset these values after fully charging your battery.3. it also measures all parameters when charging (charger connected to "load" terminals) - so you have exact Ah/Wh pumped into the battery even when your charger doesn't show it.Overall, a well designed device. Instructions in English good enough, readable and clear.
Ken Simpson
Reviewed in the United Kingdom on July 16, 2023
Looks good and is surprisingly accurate 😊 decided to fit a monitor as I accidentally drained my nearly new battery. So now at the touch of a button I can see the state of charge, vaults, drain etc and will therefore know if my built in charger isn't charging. If your van hasn't got one I'd recommend you get one of these 😉
Gerhard
Reviewed in the United States on February 23, 2023
Using this on my trolling motor. Works well. Current is fairly accurate but voltage measurement is off by 320mV according to my Fluke multimeter. No function to calibrate. Can not measure reverse flow of current. (AH reading always increasing regardless if draining or charging the battery.) Will be nice for bar graph to show SOC instead of battery voltage.
Seth
Reviewed in the United States on January 4, 2023
This review is for the 100A model tested with 3.2V, 320 Ah LiFePo4 bank and 12v 60Ah car battery measuring charge current.12V Battery:Current reading is consistently 2-3% low from 0 to 10A when cross checked against both my Fluke 289 and 189 multimeters and 4% low at 20A using another shunt known to be .05% accurate. Did not test anything higher but I would assume further decreased accuracy at even higher currents. This is below the advertised accuracy of 1%.There seems to be some bizarre ground loop anomaly that causes a false 40 to 60 mA reading when the positive battery terminal is disconnected from the shunt and any sort of external power supply/charger is connected to the negative lead, even when it’s a floating power supply.3.2V Battery:You have to hook up an external power supply when the voltage is below 8v so this is absolutely useless for use with a standalone single or double cell LiFePo4 pack or 6V SLA battery. However I tried using it with a 3.2V battery bank and additional external 12v power supply per the instructions and got some really strange behavior. The charge rate was measured somewhat accurately, but low until about 6A, then from 6A up the readings were all over the place with error as high as 100%. The device completely malfunctioned.Not For Ebike with regenerative braking:Another limitation that others have mentioned is that this reads both positive and negative current flow as positive. This means that this device will not work properly with an E-bike that has regenerative braking.User Interface/Functions:As for the actual functions, display and user interface. I like that its easy to scroll through the settings with a single button, but I don’t like that you have to reset the Ah, Wh and run time separately. It takes a total of 6 long button presses and 9 short button presses (L,S,S,L,L,S,S,S,L,L,S,S,S,S,L). Please redesign this thing to make reset all the first menu option.Amazon would not let me upload photos. Bummer.
ankur rai
Reviewed in India on August 1, 2022
very good product.go for it.
SOB
Reviewed in Canada on July 12, 2021
As described. Works good and is great value for what you get.
Ali Bazon
Reviewed in the United States on May 5, 2021
The manual is written in horrible Chinglish, no surprise there. If you could program a VCR or alarm clock, you shouldn't have any difficulties with this one even without any instructions. It's basically one button with 2 choices - short and long press.But the voltage this gadget displays is consistently 0.2v higher than both my built-in voltmeter and the standalone multimeter show. So while it's easy to make an adjustment (in my head), I'm not sure I can actually trust it with the current (A) measurement. So one star off for the useless manual and one for the inaccurate reading.
DCB
Reviewed in the United States on October 27, 2020
I purchased the 100amp version and was pleasantly surprised by the accuracy - even when running a 0.5amp load.. Accuracy was confirmed for current and voltage readings with calibrated multimeters.Easy setup, the diagrams in the instructions are very clear and are conveniently reproduced on the back of the meter itself. The meter frame has snap fit tabs for mounting in a panel, cabinet or case.The interface for setting the meter to the correct voltage range for your batteries (which you must do to get accurate state of charge info), clearing readings, etc is a little fiddly and inconvenient, but works just fine.Keep in mind this is a meter only, it will only take measurements of how much power passes through it, it isn't smart enough to track charge/discharge, and will not do anything to prevent over charge or overdischarge of your batteries.
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