SOC going Down VDC going up

[FlaRider]

I am boondocking and started the generator this more to get the HP going and change the batteries. The VDC is going up but the SOC is dropping it was 90 now the SOC is 59 and everything is turned off. The Precision power control system is showing 17 amp draw but all except for lights are off. Any idea?

I have Magnum BKM and ME-ARC

[ghaynes754]

Screen shots of the ME-ARC might help. Check the circuit breaker/switch that is on the generator to make sure that it hasn't tripped. Is the Heat Pump running? The Precision Power showing 17 amps AC? That sounds about right for the HP. What is the ARC saying for AC draw? Is the charger light green on the ARC? Maybe the charger isn't turned on?

[FlaRider]

HP are off, Oasis off. Breaker ok. Attachment 1Attachment 1Attachment 1

[FlaRider]

Let me try the pic again poor signal Attachment 1

[FlaRider]

[FlaRider]

[FlaRider]

I shutdown generator when VDC showed 13.1 and SOC showed 51. Now that the generator is off the VDC shows 12.29 and SOC is at 100. I’m so confused [emoji12]

[C.Martin]

First thing I would check is the orientation of the Blue and Orange wires. If you reverse them...the amps going in will register as amps going out. 100% is recalibrated from the charge voltages.

Second...if the sense leads orientation is correct...I would use a DC clamp meter to read amps going into battery bank. Compare the clampmeter reading to the BMK meters reading of amps. If you find a large disparity...you might try rebooting the BMK module. Remove the connector from the module...wait a minute...and reinstall. See if the clamp meter measurement and BMK meters measurement agree.

If they are still in disagreement...would there have been a time since the BMK worked as expected and now that you possibly interrupted the ground to the inverter without disconnecting the inverter positive lead? If so, you possibly fried the BMK module. You'll have to try another module...and going forward, make sure you disconnect the Inverter positive DC lead, before the Negative lead.

[C.Martin]

-136.2 amps...

I have no idea what configuration you are in. If that is generator running, and voltage going up as described... (ie...charging and not running hair dryer, microwave, etc...) even if your blue orange leads are reversed...I would ask, what kind of batteries do you have, and do you have solar? The MS2812 only puts out 125A charge at 100%. If you have flooded lead acid, or some AGMs...your charge current should be limited. I am assuming the negative is really a positive. If it were truly a negative 136.2 amps...voltage would be going down, not going up.

[WYRon]

The voltage reading while charging is much different (higher) than when not. Also very different (lower) when using microwave or under other heavy load.

[96 Wideglide]

Odd!

Pic 1 shows bulk charging at 13.1V. That's too low for bulk charging .

[C.Martin]

Originally Posted by 96 Wideglide

Odd!

Pic 1 shows bulk charging at 13.1V. That's too low for bulk charging .

Not really...bulk goes on amperage. The voltage goes up with time. It may start down around 12.9...and go up until absorb voltage of 14.? depends on setting. When it reaches absorb...it will stay constant voltage, and amps go down...then kick to float or silent, again depending on settings.

[FlaRider]

Thanks for the info. I’m not at the coach right now but will check the connection and the other stuff you mentioned.

I read your post about disconnecting the positive first so I don’t think I made that mistake.

[redbaron73]

Deleted...wrong thread