More solar power generated than consummed but battery levels dropped

DIY
1

I have a small 12v solar system that generated 4.9 kWh of power and consummed 4.1 kWh yesterday - so generated 15% more power than it used.
Yet my battery level went from 78% to 71%.
Is there something this Victron chart should be showing that it is not?

image
image1472×646 25 KB

2
  1. Where is your SOC coming from.
  2. Do you have DC loads.

As ever, very hard to answer questions without any context.

3

  1. SOC coming from venus which takes it from, I assume, the smart shunt

  2. yes, but minor loads - a couple esp32 and a raspberry pi running venus (nothing that would account for .8 kWhs) - all connect with the the smart shunt between them and the battery.

4

In Venus you should check the SmartShunt has been chosen as the battery monitor in

Settings, System Setup, Batteries, Battery Monitor.

You should check the SmartShunt wiring to make sure that the SmartShunt battery terminal is the only thing connected to the battery negative imcluding any grounding cables and all loads, chargers, grounding cables are connected to the load side of the shunt. If so the SmartShunt should be reliable for SOC.

5

Settings, System Setup, Batteries, Battery Monitor - is set to ‘Automatic’.

There are options for no battery monitory, my Multiplus, and my Smart Shunt.

If I change it frrom Autmatic to SmartShunt do I have to do anything else (like let the battery go to 100% first)?

The only thing connected to the batteries is the smart shunt.

6

Automatic should select the SmartShunt as the best option, but personally I set it to SmartShunt to be sure.

You can just swap, no need to sync to 100%.

7

Thanks - I switched it from Automatic to Smart Shunt; reading seemed to stay the same.

Will see what happens …

Thanks again