Hello,
I’m looking for advice regarding optimization of a hybrid ESS system that includes both solar and wind generation.
System configuration:
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3 × Victron MultiPlus-II 48/5000/70-50 (configured in 3-phase)
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Victron SmartSolar MPPT RS 450/200
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6 × Pytes V5 batteries
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Cerbo GX
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Ryse Energy wind turbine with DC wind charge controller
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SmartShunt for monitoring
The system is running in ESS mode.
Objectives:
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Maximize self-consumption by storing generated energy in batteries and using it when production is insufficient.
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When batteries are full, maximize export of excess energy to the grid.
Problem description:
The wind turbine charge controller operates autonomously. When the batteries reach 100% SOC and voltage reaches float level, the wind controller diverts all generated energy to a dump load.
This allows me to achieve objective #1 (efficient battery charging), but prevents achieving objective #2, since excess wind energy is not exported to the grid.
With solar (MPPT), this issue does not occur because DVCC allows the inverter to adjust export power dynamically. However, this mechanism does not apply to the wind turbine controller.
Main question:
How can I prevent the batteries from reaching float (100% SOC) while the wind turbine is producing, and instead keep them around ~97–98% SOC?
My assumption is that this is the only way to prevent the wind controller from diverting energy to the dump load.
Proposed idea:
I am considering dynamically adjusting the ESS grid setpoint to keep battery charge/discharge current close to zero during high wind production.
However, I see several challenges:
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The grid setpoint should not be adjusted too aggressively (to avoid instability)
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At the same time, it must react fast enough to follow production/consumption changes
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The goal is to minimize battery cycling (“hunting”) while maintaining optimal export
Additionally, the algorithm should periodically allow the batteries to reach 100% SOC in order to ensure proper cell balancing and battery health.
Another approach I have considered is reducing the float voltage via DVCC settings. However, I assume this might negatively impact the maximum energy harvest from the solar MPPT, since it would effectively limit the charging voltage.
Questions to the community:
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Is there an existing built-in solution in Victron ESS/DVCC that I might be missing?
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Has anyone successfully integrated a wind turbine in ESS while preserving export capability?
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Would implementing a custom control loop (e.g., via Node-RED on Cerbo GX) be the correct approach?
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If yes, what would be a recommended control strategy (e.g., PID, smoothing, thresholds, etc.)?
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Would lowering float voltage via DVCC be a viable workaround, or does it significantly reduce solar yield in practice?
Any insights, experience, or suggestions would be greatly appreciated.
Thank you!
Best regards,
Janis Barscausks