diy solar

diy solar

Battery Monitor Cheap

I ordered this one, it's cheap, and I belive supports an external relay

US $30.87 51%OFF | JUNTEK VAT4300 400V 300A Wireless ammeter voltmeter battery capacity monitoring coulomb counter 12V 24V 48V color screen meter

I have the 100 amp Juntek version and have been happy with it and from my testing has been accurate. The nuts on the shunt are a little tricky to get tightened as the bolts are loose. There are youtube videos showing this. But all I had to do was spin the nut on until hand tight, then I was able to torque it down without any problems. No disassembly required as shown in the youtube videos.

I am not using a relay but I have confirmed the relay circuitry works. The only thing I am not sure of is the capacity part of the meter. I will be doing some more testing on it but the capacity reading seems to be a problem with most of the cheap meters. But as far as watt hours and so forth it's accurate.
 
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