Is this normal for a BMK

pyintheye

Hi to all
The charging amp values from the BMK read out on the Remote are not in sync with the Magnum, Inverter amps screen. There seems to be a greater discrepancy as the battery voltage increases. At absorb voltage there is a 3.5-4 amp difference, and up to a 7 amp spread when I am equalizing. Can anyone tell me what screen I can really believe or If I may have an issue to correct.
Thanks

BB.

Is the Magnum Inverter the only charging source/load when you are testing the BMK Battery Monitor?

If you do not have one yet, a DC Current Clamp Meter is very handy for answering these questions... Sears sells an AC/DC Current Clamp DMM that is "good enough" for our needs. (note: normally $60--But currently on sale for $45 at the time of this post Nov 16, 2016).

-Bill

pyintheye

BB. said:

Is the Magnum Inverter the only charging source/load when you are testing the BMK Battery Monitor?

If you do not have one yet, a DC Current Clamp Meter is very handy for answering these questions... Sears sells an AC/DC Current Clamp DMM that is "good enough" for our needs. (note: normally $60--But currently on sale for $45 at the time of this post Nov 16, 2016).

-Bill

  That's really why I was asking. This is night time with Generator running/8000W. A 2000W water heater AC and my usual house draw of 5-8 amps@48V, also AC. The charger is set to 90%, to get 54amps, for a 435AH/48V battery bank. It settles in to 53+ amps on the BMK readout but shows 57-58+ on the Inverter readout. Battery temp @ 75C.
I didn't think to check it with the Clamp Meter. I was just wondering if it was normal for the 2 readouts to be out of sync or if this is just a Magnum software programing glitch. Any other suggestions/ observations from other posts?
Thanks

SolarMusher

You'd better trust your BMK meter display only. If correctly mounted, in/out current to your batteries is pretty accurate.
A+
Erik

pyintheye

Just did the clamp meter test and the BMK readout is the winner.
Thanks All.

BB.

Yes,  inverters are designed to turn DC into AC power. Logging and measurements do not need to be very accurate. A precision resistor costs a fair amount 6 of money and space which is not used by many inverter customers.

-Bill