DC watts increase with increased PV watts

Question

question

Jerry Mitchell asked May 12, '22

DC watts increase with increased PV watts

I have a RV with a MultiPlus 12/3000/120-50 120V VE.Bus (UL) , Cerbo GX, SmartSolar MPPT 150/100-TR VE.CAN 12/24 volt, and a BMV-712 Smart Monitor.

Everything seems to be working more or less ok, but when my panels start going up in watts, so does the DC power. I have confirmed multiple times there is nothing in the RV pulling this load up, so my guess is somehow the system is reading the incoming PV charge as load. Any ideas on why this might be occurring?

dc system

screenshot-2022-05-12-105917.png (34.1 KiB)

2

2 |3000

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

shaneyake commented · May 12, 2022 at 04:51 PM

Can you please post a diagram of how it is wired, most likely the shunt is wired incorrectly.

0 ·

Jerry Mitchell shaneyake commented · May 12, 2022 at 05:21 PM

I haven't finished bolting everything down just yet, so it's a bit messy. It looks like it's wired correctly according to the manual. Thanks for the help!

0 ·

pxl-20220512-171527351mp.jpg (261.8 KiB)

Modifications Space

Node Red Space

Answer 1 · 2022-05-12T19:20:07Z

shaneyake answered · May 12, 2022 at 07:20 PM

Okay, the battery should connect to the shunt. No other connections should be on the battery negative other than the shunt.

Your inverter, MPPT and anything else you have should then connect to the shunt Load Terminal.

2

2 |3000

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

Jerry Mitchell commented · May 12, 2022 at 07:23 PM

Makes perfect sense! I'll rewire and hopefully that will nail it down. Thanks a ton for the help!

0 ·

kevgermany ♦♦ Jerry Mitchell commented · May 13, 2022 at 05:20 AM

Also earth the battery on the load side of the shunt

0 ·

question