DC Multifunction Battery Monitor Meter, 0-200V 0-100A LCD Display Digital Current Multimeter Voltmeter Ammeter for Cars Rv Solar System

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.

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.

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.

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.

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.

This is a great monitor. It is easy to read, easy to install, works well, and give you a lot of information in one device. I am pleasantly surprised what good value for the money I got on this one.

I like the variety of readings that it displays. Fairly easy to hook up.

My third unit has just died after less than 8 hours of running time. The two previous units before this failed as well in a similar manner. The failure modes have been the same for all - the display initially starts normally showing all segments of the display lit up (all 8s and a full voltage bar) but then fails to transition to a normal display of the current values. Nothing I do can break it out of this initial boot display. When the first unit failed past the return period I contacted Amazon and they graciously made an exception to replace it free of charge. When the replacement also failed I sat down and took a very close look at my usage, thinking that something in my circuit might be causing it to fail. I use this to monitor the 12v power usage of a portable astrophotography power unit. The power source can be either the output of a 12v Mean Well power supply when operating on AC or a direct DC input from a car battery when running remotely. I looked at dozens of one-shot turn-on transients from the power supply and from the shunt on an oscilloscope, basically any lines to the meter (which all looked fine). This included possible transients between the shunt lines and the 12v supply/ground, which were also clean. Nevertheless I added high speed overvoltage protection diodes and low pass filters to protect the 12v supply to the meter AND to limit any transients on the sense line that I might somehow be introducing (these are things that I should not have to do but I wanted to rule out my setup). These voltages looked very clean before I installed the latest meter that I purchased. But it too failed in approximately the same time frame as the others. In at least two of the three cases they have failed while running, not during turn-on. I've been inside the failed units and from a construction standpoint they appear to be very high quality with a very nice backlit display. Considering that they include a very substantial shunt for the current measurement in the package I consider the price to be a bargain. The meter is perfect for my application, but there is either a design problem with the input line protection on the meter or my setup is doing something to kill the meters. I still think that the odds point to something in my setup, but my usage is certainly not outside of the norm for what this meter purports to do and would if sufficiently hardened to accept normal turn-on transients or ESD. Unfortunately I'll have to try something else now and resize my panel cutout. Update: I replaced this display with a similar-sized alternative and it has been working without any failure for many months. I now believe that the reviewed unit does indeed have some design shortcoming that might make it vulnerable to turn-on conditions.

Commandé un avec support pour le shunt , j ai retourné celui-ci.

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 😉

very good product. go for it.

quality

As described. Works good and is great value for what you get.