So most battery bank kits seem to have one of the China based 100a to 200a BMS that you add in. But if you were just assembling 16 REPT or EVE cells, can you use the Victron BMS to ensure proper charging and balancing of all cells? If so, can you do it with multiple 16s banks (in parallel) and not need separate BMS for the battery banks?
Can Victron BMS work with multiple 48v 16s battery banks and balance them too?
- Thread starter beowulf
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Zapper77
Renaissance Man
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Title says Victron BMS. When did Victron start making a BMS?
I think they are only for the Victron Batteries
Lynx Smart BMS - Victron Energy
The Lynx Smart BMS is a dedicated Battery Management System for Victron Lithium Smart Batteries. There are multiple BMS-es available for our Smart Lithium...
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
Sorry a bit of correction that will lead to better understanding.
1) A Battery Pack is a set of cells with it's own BMS (in this context) This is a self-sufficient stand-alone complete battery.
2) A battery Bank consists of several complete battery packs assembled in Parallel providing more stored power.
Victron makes a BMS but it is only for 12V and Very $$.
A Shunt only measures Voltage & Amperage going in/out of a battery or battery bank. It has no other capabilities.
Every LFP (any Lithium Base) Battery must have a BMS as it manages the cells and protects from Hi/Lo Volt issues or faults. Some SmartBMS' have Balancing and other functions and capabilities.
When building a Bank of Batteries there are some important rules:
1) Every Battery Pack is to be Fused with a Fuse that does not exceed the BMS limits. IE a 200A BMS should have a fuse no larger than 250A when complying to the 1.25 multiplier.
2) Wire Length from Battery Terminals to Common DC BUS must be identical length (excluding devices like shunts, switches, fuses.) This applies to ALL Battery Packs in the bank, they must all match!. (*1)
3) Wires should be kept close to each other (even gently zip tied) to prevent EMI/RFI as DC creates magnetic fields & noise.
4) It is highly recommended that the installation considers temperatures. Even 1C Temp difference between packs can slightly alter how they take charge & or discharge, This is especially highlighted when temps get farther from optimal range of 25C/77F. The colder or warmer it is, does affect performance.
*1 If wire lengths are different, that will cause issues during charge/discharge where you will see Packs with shorter wires getting a bit more charge than those with longer wires, this can cause some packs to have a slightly higher voltage over the others and this is will cost you amo hours as they attempt to counter balance between them. NOTE THIS IS CONTENTIOUS as "some whizbangs think they know better than Engineers at Victron, Samlex, Schneider" I GO WITH THE ENGINEERS & DESIGNERS not Alt Reality "I know better that they do types".
At present the most Popular BMS' in use are the Standard JKBMS with Active Balancing. They are available up to 200A Handling.
When batteries are Paralleled into a bank, they will collectively share/divide both Load & Charge and will do so proportionately relative to their capacity.
You CAN have different AH Sized packs with a Bank without issues provided it is "moderate". Up to 100AH difference is easy but a larger disparity requires more math and subsequent tweaking.
You CAN add batteries over time with LFP Chemistry. There are no issues with pack aging and such, THAT belongs to Lead Acid world, not applicable to LFP.
Hope it helps, Good Luck
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