question

aivosh avatar image
aivosh asked

cerbo ignores AC loads when DVCC used

Hi, I have a problem with DVCC.

Victron manual says:

Current drawn from the system by the inverter/charger is compensated for. For example, if 10A is drawn to power AC loads, and the limit is 50A, the system will allow the solar chargers to charge with a maximum of 60 Amps.

My problem is that the compensation function does not work. If I set a limit to 10A and AC Load is 20A, my MPPT still give only 10A and never more.

Thanks anyone for help

Hardware:

2x SmartSolar 250/85-Tr VE.Can

Smart Energy Phoenix 5000VA 48V

SmartShunt 500

CerboGX

Firmware latest version


AC loads are visible for Cerbo, as on the picture:

1667122838088.png

DVCC settings:

1667122987057.png

1667123014589.png


cerbo gx
1667122838088.png (34.0 KiB)
1667122987057.png (32.3 KiB)
1667123014589.png (22.2 KiB)
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2 Answers
nickdb avatar image
nickdb answered ·

What battery are you using? If it is a managed battery, the CAN BMS will override any setting and the lower of the two is used.

Have you set current limits on the MPPT's by any chance?

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aivosh avatar image
aivosh answered ·

Thanks nickdb


I have hoppecke lead batteries. No BMS.


Current limit on MPPT is active. 20A+40A

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nickdb avatar image nickdb ♦♦ commented ·

Ok. And the mppts are can/ve connected and are reported as externally controlled on the gx?

And it behaves like this at a lower SOC as well?

Your screenshot shows the battery is full.

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aivosh avatar image aivosh nickdb ♦♦ commented ·
One MPPT is reported as externally controlled, second is not externaly controlled. My guess is that the first one is master to second one.


I did not try it at SOC below 100. But since it instantly starts depleting the battery, it would be below 100 very fast


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aivosh avatar image aivosh aivosh commented ·
Tested on SOC 75, behaves the same
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