Battery SoC jumps to 100% in morning

[Abrisebois (Andrě)]

Hello all,

I’ve got two 150/45 charge controllers connected to a 300AH battery bank with a 300A smart shunt. All are tied in to a RasPI (Cergo GX) using Victron cabling.

I’ve charged the batteries to 100% and synchronized the shunt to 100% and set the battery capacity to 300AH. As the day goes on, the shunt shows the batteries depleting based on the consumption and the SoC reflects this. As the night goes on, the SoC continues to go down as it should. Once the morning comes around and the charge controllers become active, the SoC jumps to 100% with taking only minimal solar energy in.

I am hoping this is a simple configuration issue.

Thanks for any help you can provide.

[M_Lange (Matthias Lange - DE)]

In most cases that’s due to wrong configuration.

Battery monitor jumping to 100% or reporting a high SOC with low Volts / the BMS shuts down

This topic covers the reported SOC being out of sync with the actual battery voltage or state. It covers BMV battery monitors, SmartShunts, Lynx BMSs and Lynx Shunts and will just be called shunt below. It is also assumed that the shunt is monitoring the domestic / house / cabin battery bank and not engine start / bow thruster / winch / caravan mover battery banks. The problems may be one or more of the following and is often linked to mobile applications with small solar systems. The SOC jum…

Shunt / battery monitor not reading the correct SOC/ Amps, missing solar, decreasing daily or other misreading problems

This topic covers the SOC / Amps reported by BMV battery monitors, SmartShunts, Lynx BMSs and Lynx Shunts and will just be called shunt below. It is also assumed that the shunt is monitoring the domestic / house / cabin battery bank and not engine start / bow thruster / winch / caravan mover battery banks. The problems may be one or more of the following The SOC decreases daily despite the solar charger or other charger(s) working. The SOC increasing when discharging and falling when charging…

[Abrisebois (Andrě)]

Thanks for the reply.

When searching)g the forum I made my searches a bit too specific. Loosening up my search criteria I did find some articles discussing some configurations that I should review.

It turns out the battery voltage setting on my shunt was set far below the charge current of the charge controllers. Understanding that once the shunt sees voltage above this threshold, the SoC is reset to 100%.

Let’s see what happens tomorrow.

Thanks again.