BatteryProtect E4 Overvoltage on Brand-New Installation – Looking for Causes

[Wanakavan]

Hello everyone,

I’m facing an issue with a Victron BatteryProtect showing an E4 overvoltage error on a brand-new installation that I recently completed myself (professionally).

Here is the setup:

• 1 × Victron SuperPack 12.8V 100Ah

• 1 × MPPT solar charger

• 1 × MultiPlus 800VA

• 1 × Orion 12/30 DC-DC charger

• 1 × BatteryProtect

The client has shared the logs/graphs from both the MPPT and the SmartShunt, and both devices report a voltage around 15.6 V at the moment the issue occurred.

I have double-checked the configuration of all charging devices:

• All of them are correctly set to 12 V systems

• All charge voltages match the recommended values for the SuperPack

• The BatteryProtect is also definitely configured for 12 V operation

• The client confirmed that the main cable lugs and connections are properly tightened

I simply cannot understand how such a high voltage spike could occur on this system.

Has anyone seen something similar before?

Do you have any ideas or troubleshooting paths I should explore to determine the cause of this unexpected overvoltage?

Any help would be greatly appreciated.

Thank you!

David

[M_Lange (Matthias Lange - DE)]

What is the BatteryProtect used for?
Does this happen at any SOC or only during charging at high a SOC?

[Wanakavan]

The BatteryProtect is installed before consummers, so only to shut off if voltage battery is too low.
For that moment, it appears only once this weekend. The customer was in a sky resort by -15°C. I suppose the SOC was close to 100% because he just arrived when he saw the error E4.

[M_Lange (Matthias Lange - DE)]

Where/how exactly is the BP installed in the system?
What components are connected to the output of the BP?

[Wanakavan]

Here is the installation :

• And the 12V components :
• Lights
• Fridge
• USB
• Heater
• Water pump
• Clean and grey water level