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pruik asked

DVCC not compensating for inverter

DVCC is limiting charge current according to settings however it does not compensate for the consumption of a Smart Phoenix Inverter 24V 2000VA 230V. I've installed an 230V electric boiler and was hoping to get hot showers when the sun is abundant without overcharging the AGM batteries.

Firmware is up to date, how can I troubleshoot this DVCC related issue? Venus OS v2.66 is running on a Raspberry Pi.

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Both MPPT's are externally controlled according to the remote console and part of a VE.Smart network;

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DVCC settings;

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DVCC
screenshot-from-2021-07-26-11-07-24.png (42.1 KiB)
screenshot-from-2021-07-26-11-10-11.png (49.8 KiB)
screenshot-from-2021-07-26-11-41-49.png (26.7 KiB)
screenshot-20210726-113433.png (262.0 KiB)
screenshot-from-2021-07-26-11-49-05.png (55.3 KiB)
screenshot-from-2021-07-26-11-49-37.png (24.7 KiB)
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5 Answers
klim8skeptic avatar image
klim8skeptic answered ·

DVCC does not work simultaneously with Smart Networking.

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pruik avatar image
pruik answered ·

Thanks, I've removed the VE.Smart network altogether and will test tomorrow.

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pruik avatar image
pruik answered ·

Took a little bit longer and due to the sun abundance at the moment trying again to make this work as advertised.

Replaced all ve.direct USB cables with Victron manufactured ones and enabled Smart Voltage Sense. Disabled smart networking and Bluetooth all together. But alas, DVCC still doesn't work. It does limit charging current but does not increase MPTT output when the inverter consumes power.

Software is up-to-date and the only component I can replace is the Raspberry Pi running Venus OS with a Cerbo GX.

Before doing so... Is this something that should just work fine with a Raspberry Pi?

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klim8skeptic avatar image klim8skeptic ♦ commented ·
Looking at your AC load 851w (boiler?) would seem to consume 33a @ 25v.

33a is uncomfortably close to the rated output of your 2 mppt's, 20 + 15 amp.

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solartest avatar image
solartest answered ·
Hi,

What happens, if you disable the charge current limit of your Mppts?

My understanding is, "Limit charge current" means the current coming from the chargers into the system. Not the current to the battery (if a load is connected for example).
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pruik avatar image
pruik answered ·

Thanks, when the "charge limit" is disabled the charge current is too high for the battery bank on a sunny day.

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Related Resources

DVCC chapter in GX manual