question

jdlloyd24 avatar image
jdlloyd24 asked

Bmv-712 charging voltage off

Recently, my BMV-712 has been showing incorrect voltages while charging. For all I know, it can be off while boondocking as well. For example, while hooked up to shore or generator in bulk, it shows 13.97-14.01, whereas my cheap 12v battery monitor shows 14.65 which is accurate. Then when it moves into absorption, the BMV reads 13-13.03 vs 13.65. This is a rather significant difference, and I’m not sure what’s causing this. Any ideas??

voltage
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
wkirby avatar image
wkirby answered ·

It's most likely the 100mA inline fuse in the red wire which connects to the battery. The fuse is about 6Ω which will have a Voltage drop of about the delta that you are seeing.
A 1A fuse will have a lower resistance and a much lower Voltage drop. Try swap the 100mA fuse out for a 1A one and you should notice a vast improvement.

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.

Related Resources

Additional resources still need to be added for this topic