SCC doesn't enter absorption, just keeps charging past 100%

[Rock460]

New to Victron, and don’t understand why the 2 charge controllers are both still in bulk charge mode even after the battery has hit 100% SOC.

I have configured both charge controllers with the Smart Lithium pre-set, and only changed 1 value (float voltage to 13.6v as per the battery manufacturer manual at 12V 460Ah Heated & Bluetooth LiFePO4 Battery - Epoch Essentials)

Also, I confirmed in the mobile app for the battery (not Victron app) that the SOC was 100%.

Setup:

• RV travel trailer, 12v
• Epoch 460 LiFePO4 battery (12v)
• 100/20 SCC for ground deploy solar
• 100/30 SCC for roof solar
• SmartShunt 300 with VE.Smart network to communicate voltage and current
• Cerbox GX with DVCC disabled
• Smartbattery Sense module

Why did the bulk charge mode stay in place right up to 100%? Am I overcharging the battery now? Why didn’t the SCCs disable charging?

[JohnC]

Hi. The short answer here is that they remain in Bulk because they haven’t yet reached Absorb V.

Until they do there’s no danger of overcharging. And you have lots of V readings that match well to feel safe.
The battery is also still accepting current, so it’s not at 100% SOC anyway.

If this is a new installation, just let the chargers do their thing and charge it up fully to the target Absorb V. The SOC is a calculated figure (wherever it’s coming from), and it should then have a fully-charged base to work from (ie. a proper reset).

With a Cerbo in place, best not use the Smart Networking as well. That can cause weirdness sometimes, and not recommended by Victron.

[pwfarnell]

A lot of new lithium batteries do not have an accurate SOC when supplied, they rely on getting fully charged the first time to synchronise the SOC to 100% with the point when the charger gets them full for the first time by going to float.

[Rock460]

Thank you both for the great feedback. Much appreciated.