Dear Victron Support Team,
I am currently designing a hybrid energy system for a residential/commercial installation that combines existing Huawei SUN2000-L1 solar inverters (3 units) with a new Victron Energy backup system based on the following components:
- 2 x MultiPlus-II 48/5000/70-50 in parallel (10 kW total output)
- 8 x BSL B-LFP48-200E lithium batteries (51.2V, 200Ah each, total: 81.92 kWh)
- Cerbo GX + GX Touch 50
- EM540 Energy Meter
- Full AC-coupled configuration (Huawei and Victron systems operating in parallel AC bus)
Objective:
The aim is to use the Victron system to:
- Automatically power loads during grid outages and/or when PV production from Huawei drops to zero.
- Prioritize battery use at night to extend energy autonomy.
- Seamlessly assist with grid power when load demand exceeds the inverter capacity (e.g., >10 kW), using ESS + PowerAssist functionalities.
Questions:
- Is this AC-coupled configuration valid and recommended in a setup where Huawei inverters cannot communicate with the GX system directly?
- Will the system reliably detect grid import (via EM540) and trigger the MultiPlus-II to cover demand from batteries when solar production ceases?
- Are there specific ESS configuration parameters (in Cerbo GX or VRM) you recommend for:
- Maximum inverter power vs. grid assistance
- SoC thresholds
- Avoiding battery over-discharge
- Ensuring smooth grid interaction when load exceeds inverter capacity
- Any compatibility notes or best practices when using BSL B-LFP48-200E batteries with MultiPlus-II (they support CAN communication and follow Pylontech protocol)?
We appreciate any feedback or validation you can provide regarding this design and the critical parameters to ensure reliable and optimized operation.
Thank you in advance for your support!