question

milad avatar image
milad asked

Using BMV-712 with solar panels and MultiPlus

Hello everyone!


I am using BMV-712, MultiPlus 12-1600-70 and MPPT SolarSmart 100-50.

I have two 255AH batteries in parallel (AGM LifeLine).

+B1 from shunt is connected to the positive pole of one of my batteries.


I kept everything as default, I just changed the capacity to 510AH.

Also, I have synced the SOC to 100%. But it shows the SOC 99.9 when the voltage dropped to 13.1, and 99.7 when the voltage dropped to 12.85.

Based on the instruction for using solar panels with BMV, I put charged voltage on 14.2V, below the absorption voltage which is 14.4V. I still have the same problem.

I kept everything as default,

Charged detection time 3 min

Charge Efficiency Factor 95%

Tail Current: 4%

Puekert: 1.25


Why the soc is not match with the voltage? 99.7 when the voltage is 12.85.

I would appreciate if you could give me some advice on it.


Thanks in advance,

Milad

BMV Battery Monitor
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
seb71 avatar image
seb71 answered ·

So what is the issue?

SOC is not based on voltage, but on current going out or into the battery.

6 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

milad avatar image milad commented ·

Thanks for the reply.

Sorry I edited the question.

Why the soc is not match with the voltage? 99.7 when the voltage is 12.85.

0 Likes 0 ·
Show more comments