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johand asked

MPPT in parallell BlueSolar and SmarSolar

Hi. I have a setup with a Cerbo, Multiplus II, BMV712 and two MPPTs. One is the BlueSolar 150/85 connected via CAN and the other is a SmartSolar 100/20 connected via VE.Direct USB.

When I connect them both shows up in the cerbo interface and reports current voltage. But only one (the BlueSolar one connected via CAN) is delivering solar power. The other reports voltage but 0 W. I tried to disconnect the panels to the BlueSolar and then the Smartsolar started delivering power from the panels.

Question is: Can you run two different MPPT in parallel with the Cerbo at the same time or is there a limit or a setting that prevent my setup from working as I thought.

Firmware is the latest on every device except for the Multiplus (fw 494).

Thank you in advance!


pv.jpg This screenshot is from when there was minimal sun. MPPT-0 = BlueSolar. MPPT-289 = SmartSolar.

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3 Answers
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johand answered ·

Fun thing happened @Seb71

When I activated the feed in function the other MPPT-289 started to producing power.

So maybe your right Seb71, the ESS-system thinks that my load is to little and therefore it only has one MPPT active. But my batteries need to be charged by the sun and therefore I want to use all available sun power to charge them.


So I changed this:

pv-feedin.jpg


I cannot feed-in excess PV power, so a limit on 0W should prevent that.

And now everything is working :)


pv-total.jpg


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johand answered ·

Ok so I got another SmartSolar 100/20 and hooked it up to my CerboGX via Ve.Direct. Running two MPPT SmartSolar 100/20 to the Cerbo.

Now I can use both of the without feed in excess PV.


Conclusion:

Cerbo GX and ESS cannot use different models of MPPT without the feed in excess PV settings enabled.

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seb71 answered ·

Is DVCC enabled?

In the screenshot the PV is producing only 11W. How it looks during the day when you have a load closer to the total PV array power?


Question is: Can you run two different MPPT in parallel with the Cerbo at the same time

Yes.

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johand avatar image johand commented ·

45ae55d3-4753-43fd-82d5-40b3ca85823c.jpegYes, DVCC is enabled.

37b9f121-df18-4d94-82ba-e940435827d6.jpeg


Today only one array was producing but that looked ok regarding the watts.

MPPT-289 (SmartSolar) was at 0Watts the whole time.

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seb71 avatar image seb71 johand commented ·

Is the BMV set as the battery monitor?

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johand avatar image johand seb71 commented ·

d78766cc-bd79-4841-abc8-ac075769b480.jpeg

Yes.

Thanks for the quick response

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