trougnouf
New Member
- Joined
- Aug 15, 2021
- Messages
- 38
Hello all,
I am trying to design a battery pack that will be much more cost efficient than 3x Victron's 200Ah 25.6v batteries (4000 euros each).
This is all new and a bit overwhelming to me. I get that I need 16* 304Ah cells (which can be found on Alibaba); 8S and 2P. The BMS and balancing aspects are foreign though.
BMS:
- From what I understand, the BMS sends a charge and/or load disconnect signal when appropriate. I read that parallel configurations sometimes require multiple BMS (8S2P). Is it possible to still have only one connect/disconnect signal ? I don't need the redundancy of having a part of the battery pack as a backup and one signal seems easier to handle.
- (I think this is my main question) In 2P8S (one BMS), how is the BMS connected to the cells? What do I need to look for in a BMS that handles this configuration?
- Do some BMS handle the load/charge disconnect instead of sending a signal? (I don't necessarily need that but curious about what I am looking at sometimes)
Load balancing:
- I'm just starting to discover these devices. Will it make a difference whether I have my battery packs in parallel one way or the other? (eg with the 8S2P "Fortune cells layout" which uses only one BMS). How is it connected and what do I need to look for to get a compatible load balancer?
I don't really care about the cost so far since it will be far below the cost of 3 Victron batteries, I want to make what's theoretically best for the battery pack's safety and longevity. I've attached a diagram of my system's current planning stage (before looking into DIY battery) for reference.
I am trying to design a battery pack that will be much more cost efficient than 3x Victron's 200Ah 25.6v batteries (4000 euros each).
This is all new and a bit overwhelming to me. I get that I need 16* 304Ah cells (which can be found on Alibaba); 8S and 2P. The BMS and balancing aspects are foreign though.
BMS:
- From what I understand, the BMS sends a charge and/or load disconnect signal when appropriate. I read that parallel configurations sometimes require multiple BMS (8S2P). Is it possible to still have only one connect/disconnect signal ? I don't need the redundancy of having a part of the battery pack as a backup and one signal seems easier to handle.
- (I think this is my main question) In 2P8S (one BMS), how is the BMS connected to the cells? What do I need to look for in a BMS that handles this configuration?
- Do some BMS handle the load/charge disconnect instead of sending a signal? (I don't necessarily need that but curious about what I am looking at sometimes)
Load balancing:
- I'm just starting to discover these devices. Will it make a difference whether I have my battery packs in parallel one way or the other? (eg with the 8S2P "Fortune cells layout" which uses only one BMS). How is it connected and what do I need to look for to get a compatible load balancer?
I don't really care about the cost so far since it will be far below the cost of 3 Victron batteries, I want to make what's theoretically best for the battery pack's safety and longevity. I've attached a diagram of my system's current planning stage (before looking into DIY battery) for reference.
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