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martijnt avatar image
martijnt asked

Multiplus II ESS negative gridpoint to discharge/use battery

Hi,

I've got a battery set up in a mobile environment with a MultiPlus II, Cerbo and MPPT charge controller.

When plugging in shorepower, using the ESS setting to feed excess solar power into the shorepower (grid) is easy enough.

A quick experiment with using a negative gridpoint shows that the MPII can feed power from the battery into the garage/house, I can see the effect on the power meter in the utility closet.

But I was wondering if it's possible to discharge the battery, preferably during the night, to feed power into the garage/home. I noticed you can schedule charging from grid to batterty, but not the other way around.

Questions:

  1. Is using a negative grid point an unwanted work around or is it valid usage (in this case, for a mobile systems, where the garage/house is obviously not connected to "AC OUT" of the MPII).
  2. Will a scheduled discharge be available in the software?

Any thoughts?

With regards,

Martijn

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nickdb avatar image
nickdb answered ·

Load the large image on the GX, you can then use node red to use whatever logic you like, to change the setpoint. Nothing wrong with doing it this way.

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martijnt avatar image martijnt commented ·

OK, thank you.

I've found "how to install Venus OS Large" here ( https://www.victronenergy.com/live/start?do=search&id=venus-os%3Alarge&q=#how_to_install_and_update ) and given that I just updated to v2.90 normal, this was very easy to do.

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