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electrical-revolution asked

BYD / Victron set up. 150/70 MPPT + 250/60 MPPT - How to prioritise ?

Have a client with a BYD / Victron set up. Has a 150/70 controller for solar. 250/60 controller for hydro. The 250/60 is set up with using relay to divert load when BYD doesn't need anymore power. Diversion is done by a 230V relay from the power system to electric underfloor heating.

Problem: When diversion is active and it's sunny the system clips the 250/60 and uses the 150/70 to power the diverted load which I need to keep the 250/60 with load to stop over spin of the hydro.

Question: How do you prioritise one MPPT over another MPPT when EXT controlled by BYD/GX?

cerbo gxBYDHydro and Wind Power
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2 Answers
electrical-revolution avatar image
electrical-revolution answered ·

After 5 months of running I found a good way to resolve this problem.

Solar controller is running it's AUX relay on high voltage. Linked to the on/off control. As the battery's enter near 99% the solar controller turns off leaving the hydro to do the top 1%. As the hydro is producing more than there night base load the battery reaches 100% for equalisation at night. If the load is high the solar controller turn back on as voltage drops to meet that load if the sun is out.

Were there's a will there's a way.

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nickdb answered ·

You don’t. That’s why it isn’t a wind turbine controller.

Completely unsupported use.

Short of reducing the current limit of the larger one, which you could do creatively via node red, you’re a bit stuck.

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Mike Dorsett avatar image Mike Dorsett commented ·
read hydro instead of wind, but same result...
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