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maha avatar image
maha asked

Limit dc charging power

I have a Fronius Symo 8.2-3-M as well as a MPPT 250/100 in use. DVCC is activated and the charging power is limited to 20A. Nevertheless, the batteries are charged with more than 20A from the MPPT. The DC charging power is therefore not limited! Is this a bug or a feature?

battery chargingESS
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seb71 avatar image seb71 commented ·

Do you have a shunt?

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maha avatar image maha seb71 commented ·

Yes. Victron BMV 702 is in use.

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seb71 avatar image seb71 maha commented ·

And that current >20A is read/indicated by the shunt (BMV) or by the SolarCharger?


SVS and SCS are enabled in DVCC?


The current limit set in DVCC is a limit for the current into the battery, not a limit for the solar charger current (Amps) output.

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maha avatar image maha seb71 commented ·

The dc-load into the batteries is not limited. The MPPT sends all its power into the batteries during bulk-loading and this is not desired because the load is too high for the batteries.

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seb71 avatar image seb71 maha commented ·

List the entire system you have.

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maha avatar image maha seb71 commented ·

It seems that you do not recognize the problem...

DC-load from MPPT will not(!) limited during bulk-loading!


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seb71 avatar image seb71 maha commented ·

OK, good luck.

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2 Answers
maha avatar image
maha answered ·

Two screenshots for showing the problem:


screenshot-2021-03-13-114855.png

screenshot-2021-03-13-115620.png


screenshot-2021-03-13-114855.png (46.6 KiB)
screenshot-2021-03-13-115620.png (20.5 KiB)
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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Hi @MaHa

What are your ESS settings? (feed in allowed? limited?)

as soon as feed-in is enabled, MPPT is not limited anymore.

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maha avatar image maha Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

1615649548483.png

With these settings, the MPPT charges all the power to the batteries instead of only 20A and the rest to the grid. It's a bug!!!!

In a german forum you can read an explanation:

DVCC bug

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1615649548483.png (24.7 KiB)
Al avatar image
Al answered ·

Hi,

Seb71 already asked if SCS was turned on? Is it? and is it 'Active' or 'Ext Control'?

There was an issue with VE.Can MPPT's not working with SCS, but you also didn't answer seb71 what your system is for him to help.

If it is VE.Can then there is an update soon that works, in the meantime maybe limit the MPPT output to protect your batteries.

Is your battery bank quite small as 20a charge limit is quite low for how much solar I guess you have?

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maha avatar image maha commented ·

1615638854255.png


@Al If it is VE.Can then there is an update soon that works, in the meantime maybe limit the MPPT output to protect your batteries.


Then I will hope that the update really comes soon...:-)

To limit the MPPT is no option for me.

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1615638854255.png (29.2 KiB)
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VictronConnect VE.Bus charging manual