MP2 Overload &/or Temperatur warning / alarm controlled with Node-red

DIY
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1

Hi together, I’m using my MP2/3000 with node-red for charging and discharging control.

It’s all working fine.

Actually I’m limiting the discharge power at 2.400 W, while 3.000 VA at max. 25 °C is possible.

I’d like to use some more power, while monitoring Overload &/or Temp warning / alarm. I.e. limit to 2.600 W and reducing to 2.400 W when an warning / alarm occurs.

My question:

  • Any information available about the time frame for temp rise at various ambient temperatures ?
  • Any graph for the dependencies warning / alarm and time available.
  • Delay times between warning / alarm / shut off(down)

Actual background: The battery powers the heatpump during the night and when the demand increases at early morning (ambient temp around 4°C) the power demand exeeds the actual 2.400 W limit and grid power kicks in, too.

2026-04-07 10.04 5412
2026-04-07 10.04 5412382×296 35.5 KB

This morning:

  • Blue: Power demand
  • Orange: Discharge power battery
  • Red: Grid power demand

Any hints available ?

2

An MP2 48/3000 is capable of delivering 3kVA or 2.4kW at up to 25°C. Both of these power figures are possible at the same time due to powerfactor/cosPhi.

If you are demanding 2.6kW out of it then you are already overloading the inverter.

If i understood correctly then you are using it in an ESS? Or at least something similar built in NodeRed. Have you actually tried to push it to 2.6kW feed-in? I would be surprised if the inverter would allow for that, but ive never tried myself.

I know that in island operation you can demand higher power output for some time, but in that case the load is switched on and the inverter does not have much of a say in the matter.

But parallel to mains the inverter can simply limit whatever you demand from it from external control.

3

Thanks for your reply.
Yes, I build my “own” ESS, however Victron ESS is activated.
No, I’ve not tried to feed-in above 2,4 kW, as I’d like to get upfront some more information about the overload behavior - No interest in “trial and error” testing :wink:
In island operation the “instant overload” comes out of the capacitors.
In grid parallel operation overload capabilities must derive out of the power circuit, incl. cooling.
Any mapping would be highly appreciated.