Jan, who lives in the greater Hannover area, has integrated the first test battery modules from Biwatt, each with 3.6kWh, into his PV system as an off-grid system. He is also looking into integrating the batteries into MQTT and Node-Red via Victron Cerbo GX.
Use Case:
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Off-grid system (single-phase)
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7kW heat pump (from winter)
Key data of the project
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Inverter: Victron Multipus II (5kW) + MPPT
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Storage size: 10,8kWh
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PV-system: 6kWp
Jan is already operating a lithium iron phosphate (LFP) storage system and has come up with a sophisticated concept for using both storage technologies. The LFP battery system is already controlled by a Victron Mulitplus II inverter. Another Multiplus II was installed to integrate the sodium-ion battery. This separate circuit is operated as an off-grid system. This has the advantage that the battery charging voltage of the Mulitplus II can even be reduced to 35V, and 94% of the battery capacity can be used. A DC/DC step up connverter was also connected between the battery units to enable equalisation charging between the lithium and sodium battery system.
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