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john-hagtharp avatar image
john-hagtharp asked

Problem with DVCC charge current limit and parallel multis?

I'm running latest release candidate in my CCGX so posting here in case it's an issue with the beta.

I have 2 x Multiplus 48/3000/35-50 (firmware version 431) in a single phase parallel setup. I'm using the DVCC maximum charge current setting to avoid hitting my smallish battery bank too hard. It worked as expected previously with a single Multi but, now I've switched to the parallel setup, I've found I need to specify half the desired charge current. A setting of 17A gives me 34A charging current.

This seems to be a bug. I have not tested but expect it will be limiting my day time charging from the solar chargers to 17A so running this way is not ideal.

I'm happy to do further testing with different firmware versions if required but will need to run the battery bank down some time to do so. I usually run ESS "keep batteries charged".




MultiPlus Quattro Inverter Chargerbattery chargingDVCC
2 |3000
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2 Answers
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Thank you John, we’ll look into that. Is it ok if look up your system on vrm & login on remote support if necessary (pls enable that feature)


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john-hagtharp avatar image john-hagtharp commented ·

Hi Mathijs. Yes, please feel free to login. I just removed the VNC password so I think it's ready for you to connect. Installation 13976.

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john-hagtharp avatar image john-hagtharp commented ·

Thanks Mathijs and Izac. Only two weeks from reporting the issue here to a fix being available. Another good reason to choose Victron!

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Elimac avatar image
Elimac answered ·

Hello,

I have also 2x Multis in parallel and I can't see the same behavior. In my case it seems working as it should, at least in high currents. Tested changing from 40A to 60A and it instantly changed.

However, in lower currents, is not as precise, and normally I have to set lower (for example, set for 10A to have 15A) but is not half in my case...

2x Multiplus 24/3000/70-16.

VenusGX with last beta

2x MPPT 250/60


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Elimac avatar image Elimac commented ·

The Multis have latest version, 459 and the MPPTs have 1.39

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john-hagtharp avatar image john-hagtharp Elimac commented ·

I'll cycle the batteries down and test this again. As I keep the batteries charged, I only had one opportunity to observe this when grid power was restored late one evening. The solar chargers were playing no part.

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