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.

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.

Arrives in a nice package with meter, shunt, wires, and instruction sheet. Unit is small, smaller than you might think from the picture. Which can be either good or bad. Instruction sheet reasonably clear on hookup. Except it doesn't say how/where to connect charger. The ammeter is unidirectional, which seems to mean current flowing in either direction gets added. Which in turn means the counts on AH and WH increase as a result of current flow in both directions. I think this means that if you connect the meter like the load, the counts will increase as you charge, and increase further as you discharge. And if you charge and discharge simultaneously, the counts will increase based on the net. Alternatively, you could connect the charger directly to the battery, in which case the meter would only count discharge loads and ignore any charging. Or you could get two meters, with one and its shunt for the load and the other and its shunt for the charger. Instructions obviously translated from Chinese. Good enough if you have a basic idea of what you're doing anyway. Some notes: a) the unit has label "External resistance", which seems to be listed as "Impedance" on the instructions. b) the instructions use the term "Bring load voltage", without defining it. Presumably this is the voltage across the load at the current point in time. c) Internal resistance is defined as (full voltage - bring load voltage) / bring load current", which maybe means drop from full voltage to now voltage, divided by now current - but I'm not sure what sense to make of that quantity. The voltage range (min and max, for showing battery bar graph) and current range (max, determined by shunt in use) can be set by alternating between long and short presses of the single front panel button. Which is small and requires a screwdriver or pencil or such. Similarly, the AH, WH, and run time counters can be reset. Meter has two modes, working mode and dormant mode. Dormant mode shuts off the backlight display and stops all measurements and calculations. Instructions report power consumption 0.031.2W in normal mode, 0.5mw-0.5W in dormant mode, dependent on voltage value (higher voltage, higher power). Don't yet have a sense for accuracy. Lots packed into a small meter for a low price.

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.

You would expect a meter that shows battery capacity and energy usage to have no problem understanding Charge-Discharge. But it doesnt! It considers both directions the same! This means that it is useless to get a amp hours left value. or measure state of charge by watching energy in-out. The only meaningful value on the display is the fuel gauge. in that case. And the amperage value you have to guess if that is charging or discharging.

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.

Works as it should. Came quickly. Only thing the directions are a little difficult, but for the price not a problem.

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.