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Relay Mode Configuration
To set the relay control mode, go to Battery → Relay Mode in the sidebar.
This setting determines how the BMS handles relay logic based on your system voltage and wiring.
Available Relay Modes
1. Onboard HV Isolation Test
- Designed for high voltage systems
- Activates the full 3-relay setup including precharge and isolation test
- Matches the HV relay wiring described here
2. LV with Precharge
- For low voltage systems (e.g. 12 V or 24 V setups)
- Uses a simplified relay logic with optional precharge
- Matches the HV relay wiring described here
3. ReadBack Relays with STO
Only available on GRNBM_MK3_HV_STO
Monitors relay state of battery plus and minus via 4 SPDT switches per relay
Simple on/off switching without precharge
Full monitoring of switch-on and switch-off process
Includes a 24 V STO output to control external inverters
Wiring diagram available here
⚠️ Make sure the selected mode matches your physical wiring, otherwise the system may not function correctly.
Activation Required
🔓 Each relay mode must be unlocked separately via grnbms.de.
Only the modes you've purchased will be available for selection.