Pylontech US3000 Upgrade (Should change BMS Type Cable?)

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sanchuka asked Jul 5, '22

Pylontech US3000 Upgrade (Should change BMS Type Cable?)

Hello,

I'm offgrid user and today added 2 pylontech us3000c to my existing us3000b. Since us3000c is now master battery i read that should be use victron bms type a cable. Since i have previous victron bms type b cable i connected with it and is working (5 modules recognized). I'm planning to change it when i travel near a victron dealer as per documents recommendation, but is unsafe using like this meanwhile? what is the function of pin "gnd" where i notice is the cable difference?

Thanks, attached some pictures. (balancing cells before connect to cerbo. cerbo gx information after connecting) winter time patagonia-southamerica.

cerbo gx BMS Pylontech

a37013a8-5711-4564-9ee7-1c46e3d972e0.jpeg (2.0 MiB)

819d8145-853e-4d04-b336-c5248b5b4d5c.png (83.9 KiB)

8c49a7b9-1e7c-4adb-8e0a-3a97dd039e8e.jpeg (128.1 KiB)

8200b23b-ebd4-4363-9d5f-bd1049319d4a.jpeg (97.4 KiB)

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Modifications Space

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Answer 1 · 2022-07-06T14:42:22Z

sanchuka answered · Jul 06, 2022 at 02:42 PM

@Ned Yu (Pylontech) May you help me please with your advice and technical comments, Thank you! Regards!

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Answer 2 · 2022-07-07T07:07:11Z

ponzoa answered · Jul 07, 2022 at 07:07 AM

In theory yes, you need to change your cable. I would change it, even if it is reading info from the battery as it's a low cost item.

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sanchuka commented · Jul 07, 2022 at 06:46 PM

yes, as soon arrives to city new cable type A i will change it. Meanwhile i hope not to be unsafe using it like mentioned above (cable type B). thank you!

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Answer 3 · 2022-07-08T00:43:44Z

Guy Stewart (Victron Community Manager) answered · Jul 08, 2022 at 12:43 AM

Hi @Sanchuka,

I think you are doing everything correctly, get that cable changed as soon as possible.

My limited understanding is that your current configuration opens the possibility for a potential differential which could in some circumstances lead to communications issues, and potentially damage to the communications chips, as there might be an earth/ground differential. This is not a certainty, not even very likely and would indicate some other issue with the system, so it's not an urgent situation - but definitely one you want have resolved long term.

If the extra capacity for the system is not important, I would leave the extra battery shut down and disconnected until the correct cable can be installed.

If the extra capacity for the system IS important, then I would continue as you have it, operational, and then replace the cable as soon as you can.

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sanchuka commented · Jul 08, 2022 at 02:07 AM

Thanks for the explanation. I will change it next weeks when i go physically to the installation. Right now is just a router and couple of wifi cameras as consumption (little cottage), so far no issues. Glad to have Victron support. Regards!

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