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sesshoumaru avatar image
sesshoumaru asked

Order of things: Adding a US2000C

Hi

I know this is no Pylontech Forum, but please bear with mef or a moment.
I have 8 Pylontech US2000C modules in a rack. I now have installed a second rack and installed additonal 4x US2000C (4x to come end of the year). Both battery racks are independently connected to the busbar. I used a default flat network cable to bring the 2nd linkport of battery 8 to the 1st linkport of battery 9 in the second rack.


However, upon putting the second rack under power, switching from off to on on the 4 new batteries, hitting the red SW button on the master battery (battery 1 in rack 1) ... nothing happend.


So I am asking myself... how is the correct order of doing things?? Somebody already did what I am trying to do? Help would be appreciated.


Thanks :)

cerbo gxPylontechQuattro-II
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Duivert NL avatar image
Duivert NL answered ·

always connected the newest battery as master, then link to additional new batterys and then to older one's

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sesshoumaru avatar image sesshoumaru commented ·

I cannot just rebuild everythig (well, can but reluctant).

The system is operational and feeds the house. Its probably not a good idea to disconnect the battery pack to move batteries.


All batteries are US2000C .. so why change the master? Newer firmware should be able to deal with that (both racks / battery towers) are 5m apart behind concreate walls. So no easy cabellig changes :/

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nickdb avatar image nickdb ♦♦ sesshoumaru commented ·
This shouldn't be done online. Shut the system off, and as per the manual, wire the new batteries as master. They likely have newer firmware and so won't appreciate older ones as master.

Make sure all the LEDS all show the same SOC, this is also in the manual iirc, they document it properly.

Then power the master followed by the rest.

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d4h-ottmar avatar image
d4h-ottmar answered ·

i'm at least with nickdb and way more to check.

Here my list: check firmware of every stackmember of the battery. PT have at least two different hardware versions named C. Also check the new delivered batteries. What makes you sure, that they are not rest in stock for a while? At least double check your configuration and start your system as PT and Victron recommend.

Otherwise what you guys do, is try and error with a high risk to damage parts of the system.

For such situations i always deploy a Bypass switch (grid connectivity)!

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sesshoumaru avatar image sesshoumaru commented ·
I have a bypass switch, I just had the hope that battery upgrade, where you just daisy chain some batteries on the end does not need all of that ;)
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