question

safiery avatar image

Smart Lithium 25.6V 10 off in two banks of 5

Looking for advice on ability to have 2 strings of 5 x 25.6V for a total of 10 in the same system configuration. There are 2 Quattros 8kVA. We have Cerbo GX as part of install.

Lithium battery Smartcerbo gx
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@safiery thanks for reaching out! I'll point some people to this question from my other communication channels and I'm sure someone will have some valuable insight.

Also, I've converted your answer to a comment so that your question shows up as unanswered still :)

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WKirby avatar image

According to the VE.Bus BMS datasheet this configuration is not possible. Datasheet says a maximum of four batteries in series I read this as four 12.8V batteries for a maximum of 16 cells in series, so only two 25.6V batteries in series to make up a 48V system.

Also, datasheet says it's maximum Voltage is 70V.

https://www.victronenergy.com/upload/documents/Datasheet-VE-Bus-BMS-EN.pdf


EDIT:
If, by a "string", you mean a set of five 25.8V batteries in parallel, then yes, that is possible for one VE.Bus BMS. Then you can have the other parallel set with its own VE.Bus BMS.
Afterwhich, you can connect these two sets in parallel to maintain a 25.8V system Voltage.

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Thank you . @WKirby The Lynx distribution states up to 32 batteries? Can that be used?

@WKirby This is a 24V system with 13kVA of 2 Quattros (8+5)

Oh, I think I am misunderstanding what you mean by 2 strings of 5 in parallel. Do you not mean 5 in series?

safiery avatar image safiery WKirby ♦♦ ·

@WKirby Thanks for response. My question was rushed: All 10 Victron batteries are left at native 25.6V from either one Lynx Distribution or two VE.BMS. Can they operate as one string or do they have to be split into two strings of 5?