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williamv avatar image
williamv asked

DVCC settings

Can anyone advise if DVCC settings for Limit Charge voltage and Limit Charge current overrides Pylontech BMS. I have tried numerous settings without any effect on these parameters. As soon as the batteries reach 100% SOC i receive High voltage alarm and high charge current alarms. Also #29 over charge protection MPPT 450/200. The alarms clear after 5 to 10mins when the SOC reduces but recurrs when SOC again reaches 100%. The batteries cells are fully balanced and in operation for about 3 months. Any advise greatly appreciated.

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Alexandra avatar image
Alexandra answered ·

@WilliamV

Are the components charging the battery programmed correctly?

Do you have a correctly sized bank for the charge amps available?

Yes the charged voltage caps the bank voltage. And charge amps is system wide in DVCC.

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williamv answered ·

Many thanks for your reply. Very new to victron and learning as i go along. All settings are as outlined in victron docs. I have 12 x Pylontech US5000. 36 x 545W panels in 4 strings to MPPT RS 450/200. Lynx shunt and 5K victron quattro - all connected to Cerbo GX. System works great - just dont like the alarms and dont want to damage the batteries.

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Duivert NL avatar image Duivert NL commented ·

hi, you can also take a look at the following, section 9

https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom

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williamv avatar image
williamv answered ·

I have 4 banks of 3 x US5000 - each bank parallel connected to lynx power in bus and then to lynx shunt and lynx dristributor.

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Alex Pescaru avatar image
Alex Pescaru answered ·

Hi @WilliamV

When the charger is being driven by Cerbo and SoC is different from 100%, the charger (450/200 in your case) is working in a different way / mode than when the SoC is 100%.

When SoC = 100%, the charger <=> battery "virtual link" is somehow "disconnected" and the charger (read here MPPT) doesn't have a "buffer" where to dump eventual current spikes generated from uneven consumption. Hence those over - voltage, current, charging errors.

So, if you don't have a feed-in enabled, the idea is to keep that charger <=> battery "virtual link" active. This is done by forcing the charger to be ready all the time and this is done by not allowing the /Link/ChargeCurrent dbus value to never be 0 (zero).

Take it somehow like a particular quirk in the case of Victron - Pylontech cohabitation.

Take a look at the topic below and you'll find there the solution that's working in my case.

https://community.victronenergy.com/questions/254671/error-code-29-over-charge-protection-on-constant-c.html

Alex


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williamv avatar image williamv commented ·
Hi Alex

i really appreciate you taking the time and giving the information. I am afraid it is a bit over my head However, i will try to work through it and see if i can find a solution. I dont think there is any damage being done to the battteries as I presume they are being protected by the pylontech BMS.

kind regards

William


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