Built a "universal" charging display.
We use Anderson connectors of assorted sizes for various things and use the 50 Amp size for auxiliary chargers and main power for smaller things.
We have 36 volt forklift and golf car used for yard work, 36 volt electrolysis tank as well.
12 volt yard compressor for tree pruning.
For chargers we have a compact forklift charger but the voltage is too high, same for golf car charger, AGM batteries do not do well with the high rate.
The compressor has a batterymaintainer type but it is used for other items.
Got tired of getting voltmeter to to check things and not knowing charging voltage so we made an adaptor box with metering.
Years ago we got some "2 wire panel voltmeters", these are great little devices, just 2 wires and they both power the unit and show the voltage.
Problem is most are only good for about 22 volts.
We found one good for 100 VDC so it is in Golf car to sow battery voltage.
We found some that are 3 wire voltmeter with 2 wire ammeter.
For the3 wire unit it is ground, 5 to 20 volt supply and measure.
We found some switching buck/boost units good for about 1 Amp, give them 4 to 50 VAC or DC and they have regulated output adjustable anywhere in there, 6 vac in can be 12 VDC out.
Only issue is no isolation so you cannot have common ground for ac input, DC is fine.
While cleaning up a corner of doom the other day we stumbled on a metal project box, the light lit, been wanting to build this for years but was busy doing other things and no box so other things got done.
Determined the Anderson connectors would fit in the ends and the shunt bar would fit between them so to the mill we go to make holes in the ends of the box.
Held in place and drilled the hole in the box through the holes in the Anderson.
Holes in Anderson are perfect for 8-32, countersunk the bottom, a center drill is perfect size, angle close enough.
Placed the shunt in the box, marked for hole and drilled mounting holes for the shunt, the holes were for cable lugs so enough room to not need to be perfect.
Removed Andersons and countersunk from bottom deep so screws are well above the bottom, tapped 8-32 and inserted some screws.
The screws for the meter connections were used for both ammeter and power supply.
The positive wire is direct through, added a pig tail to go to power supply and meter input.
Cut the hole in the lid for the meter to snap in.
The ground connects to the ends of the shunt.
Power supply wrapped in tape and stuffed behind meter.
Works great.
We can see the operating current and voltage for the battery operated compressor or fit it to connect to charger and see charging current with voltage.
Did not get photos of milling, just end product.
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