Reddit reviews MICTUNING DC 6.5-100V 0-100A LCD Digital Display Ammeter Voltmeter Multimeter Volt Watt Power Energy Meter Blue with 100A 75mV Shunt
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MICTUNING 4-in-1 DC Multimeter - with 1.0 grade measuring accuracy, it combines Voltage, Current, Power and Energy measurement in one combo, super compact and lightweight that can be portable and easily usedUnique Voltage Alarm Function- the backlight and voltage value will flash simultaneously if the testing voltage is beyond alarm threshold (6-90V factory alarm value), and it can be set if neededData Storage Design - it is designed to automatically storage the last testing data when suddenly powered off and the energy value can be reset by a short press after long pressing the function button for secondsSuper Large Digital Display - 51x30mm easy reading LCD screen, clearly displays all testing figures at the same time, while the recessed button used to control the backlight, reset energy value, set voltage alarm threshold and choose measuring rangeBonus Current Shunt - it comes with a 100A/75mV current shunt, suitable for large range measurement, no need to waste extra money to get another one.
I have an Outback Flexnet DC in my main system and a Victron BMV 700 on a second smaller system. I would suggest you buy a Victron BMV 712 Smart (1) which comes as an all inclusive package with all that you need to install it. This one also has Bluetooth which makes it super cool with charts on your phone. If you are on a tight budget you can go for their simpler non bluetooth ones. Mine cost around 100 GBP a few years ago. There is also a 15-ish GBP option in Amazon but I don’t know how well it works (2).
The Victron comes with a shunt which you connect to the battery bank negative pole and you connect the inverter and the controller to the other terminal of the shunt. You want to make sure that nothing else is connected to the negative pole of the battery so that all energy crosses the shunt. Then the monitor itself is connected to the shunt (it comes with full instructions). You want to make sure you do this after fully charging your batteries.
A monitor gives the correct state of charge of your bank which is miles better than guessing from the battery bank voltage.