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Help with Assistants to use AC2 as dumpload

If I connect my 1000 watt water heater to AC2 of my Multiplus 48/3000 and use the assistants in below screenshot, is it correct that it will do the following?

  • Start the boiler when above 70%
  • Stop the boiler when at 60%
  • Stop the boiler when overall load is above 2400 watts
  • Only start the boiler when overall load is below 1500 watts

I found this thread that I've used as reference. My system is Easysolar 48/3000 with BMV712 battery monitor running 14kw lifepo4 batteries and the reasoning is that I'll never need more than 60% of batteries for other vital loads.

Thanks a lot!

MPPT - Solar Charge ControllerAssistantsrelay assistant
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2 Answers
Mark avatar image
Mark answered ·

Yes I think that assistant logic should work correctly.

The start generator conditions should have authority over the stop generator conditions, so the expected behaviour is:

  • Turn off water heater if load is >2400 OR SOC is <60%
  • Turn on water heater if load is <1400 AND SOC is >70%

The best way to confirm is to test it yourself.

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Great, thank you! I'll confirm when I get to test in 1-2 weeks

bigvt avatar image
bigvt answered ·

This seem to be working. However, the other ac out connections on my Easysolar 48/3000 go through the RCD, and AC2 does not. Do I need a 2nd RCD for AC2 and does AC2 use the same grounding connections as the other AC outs (chassis, and in my case also grounding rods)?

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Good to hear you have the assistant working well.

Yes you need a 2nd RCD if you want/need AC2 protected from a earth leakage fault, and yes the grounding for AC1 and AC2 is common (take a look at the schematic in the appendix of the manual for your Multiplus).

Great, thank you for all the help - much appreciated!