In preparation for FD, I made a battery box, and when collecting parts for that build, I got a cheap voltmeter/ammeter. It came in a poly bag with no schematics, no documentation (unless some of the chinese text on the bag was supposed to be documentation).
The hook ups for the device are two bolts, thoughtfully marked "x1" and "x2". No color code, no wires.
I wrote the source, asking if there is documentation, or more exactly "which is positive and which is ground" and they responded with just this image:
The way I have it wired, the display is not lighting up, so I might have already killed the thing. If anyone has any hints, I'd like to hear them. Worst case, this box won't have a voltmeter until I get a replacement after FD.
That one is AC only, and needs 220V at that to work as an ammeter.
Here's the one I used for my box. Works well but slightly pessimistic by about 20mV, which isn't necessarily a bad thing in this use case.
AB0L (Formerly N0KAI)
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Kenwood TM-V71A, Kenwood TS-590S, Icom ID-4100A, Yaseu FT-891, TYT MD-UV380, TYT MD-380, Kenwood TH-D7A, BTECH UV-5X3, µBITX V5, µBITX V4, QRPGuys 40/30/20m DSB Digital Transceiver
Jeff,
That makes way more sense. I'll just have to guess at capacity through FD and replace the meter next week sometime.
If it's a standard AGM deep-cycle, remaining capacity can be had from a voltage reading while under load if you've got a multimeter handy.
12.8+ 100%
12.6 75%
12.3 50%
12.0 25%
11.8 0%
AB0L (Formerly N0KAI)
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Kenwood TM-V71A, Kenwood TS-590S, Icom ID-4100A, Yaseu FT-891, TYT MD-UV380, TYT MD-380, Kenwood TH-D7A, BTECH UV-5X3, µBITX V5, µBITX V4, QRPGuys 40/30/20m DSB Digital Transceiver
