Ammeter/ Volt meter adjustment
I installed a cheap meter to read volts and amps sometime ago along with a shunt. There are two pots on the meter one for volts and one for amps. The volts I set with my volt meter but the amps I can ...
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Gjac wrote:BFL13 wrote:So what you are saying I can't use my B&D to adjust the ammeter? Not sure what you mean by disconnect all loads to be sure both amps should be the same.
He may be right.
The Trimetric does not really show "net amps" but only the amps in or out of the battery. If there is a load running while you charge, the load will get its amps from the charger as long as its voltage is higher than that of the battery. Same with solar charging.
So the amps out of the charger or controller can be higher than the amps into the battery, which is what the meter shows, so you need to disconnect all loads to be sure both amps should be the same.
In that case, my worry about one-way amps is wrong, does not apply.
Yes you can. Just take off the chassis ground wire so there is no load from the rig drawing, and clamp the charger's neg to the outer end of the shunt. Now the only amps through the shunt are from the charger and they all go to the battery, so you can compare the two display values, and make the meter's read the same as the charger's.
That meter can be powered from the battery itself or from a separate power source as an option. See the wiring diagrams in the earlier link.
