Multiplus II How to Charge only with MPPT

Q&A and troubleshooting
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1

I have a Multiplus II 5000, an 150/45 MPPT and two batteries with 16 kWh each. The MPPT is powered by 2,7 kWp.

My question is how I can disable the AC Charging of the MPII and just charge my batteries with the MPPT?

Thinks I have tested so far, which didn’t work:

  • Set the MPII to Inverter Only. With this the MPPT also stops charging.
  • Reduce the Input Current Limit of the MPII to 5A. Works for charging, but the Output Power of the MPII ist then also limited to 5A.
  • Set the DVCC Maximum charge current to something like 40A. With this the MPII adds the missing Power from the MPPT to reach the 40A. But I only want the MPPT to charge.

My current solution is to dynamically set the DVCC max charging current to the current value the MPPT produces with an Node-Red Flow. This works, but I wonder if there isnt a better solution.

2

That is not right, there is another issue here.

Also not right. Points to something else being wrong.

To limit grid charging, you program the internal charger.
If you don’t want it charge at all, you disable it and set the charge current limit to zero.

If you want it interactive then you can use the charge current limit assistant or dig into the dbus.

Ludos suggestion is the victron built in solution to your request

3

I use the advanced feature "solar and wind priority " as introduced with v508 for multiplus and quattro, works for me, but ofc i have no cerbo / dvcc etc.

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4

Did test it again after update to Firmware 3.55 and now its working :slight_smile:

5

Ah excellent.
Usually a good first step in installing and commissioning and troubleshooting.
Is everything else up to date?

6

I set /Settings/SystemSetup/MaxChargeCurrent through Nodered every morning based on the expected Solar forecast from VRM.

Setting it to -1 allows full charging through the MP2, setting it to 0 disables charging and only allows the mppts to charge.

7

What kind of system do you have?
Stationary or mobile?

For a stationary system ESS would be the best solution.

For mobile the “solar/wind priority” and/or “Conditional AC input”.

8

Its a stationary system. Nearly 22kWp in total. Working since Dezember 2022.
Only the MPPT with 6 Panels 450W are new since last October. Batteries are DIY.
I don’t know why the things mention in my first post did not work the first time I tested it. I might be that I changed the DVCC Settings since then to now use shared voltage and shared current sense. They where both off before, as SerialBattery recommend.
But I am happy that its now working as expected. Will do some test the next days.

@aaxc Yep, thats what I want to do. Currently I also can set the amount the MP2 is loading and the SOC where it stops. And even the MPPT Power when the MP2 stops charging.

@M_Lange Thanks for your Videos. I am also based in Germany

9

Hello everyone,
I don’t understand the problem.
I also have an AC solar panel on the MPII’s Out1 and an MPPT on the DC side. In winter, I charge my battery via AC and MPPT. In summer, I only charge the battery via MPPT. The AC solar panel then feeds the power directly into the grid.

To do this, I activated the charge current limit under Charge Control and set the maximum charge current to 0 A.

Or do you mean something else?

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10

No thats exactly what I mean.

Its working now.

For what ever reason it did not work several weeks ago. Or I thought it did not work :slight_smile:

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