TotallyShocked
New Member
- Joined
- May 6, 2020
- Messages
- 3
Need advice before I blow myself up!
I am planning on building an OFF GRID Powerwall that would consist of:
Ten 24V Battery packs of 64 32650 6ah cells each in an 8s8p configuration.
Each pack of 64 cells would have a DALY 8s SMART BMS (common port) handling up to ~100a (2c for a 6ah cells).
The cells in each pack would have screws and connect to 26 gauge copper plates in 8s8p. Each pack configuration would have a solid copper bus bar connection to a larger (¼ x 2in) copper bus bar that connects all 10 battery packs in parallel. These 10 packs should give me 12.25kw at 1C or 24.5kw at 2C (~ 900amps).
I was considering connecting this battery bank to (2 to 3) 24v Growatt 3Kva split phase SPF300TL LVM hybrid Inverters in parallel, (will also add 400watts PV to each Growatt unit).
Questions:
Is an 8s8p configuration too many cells for a DALY 8s BMS to manage reliably?
Or Should I configure 8s5p or 8s4p as packs, the idea here is longevity of cells, monitoring, and ability to replace cells easily. Specifically what is good parallel cell ratio for LFP 3p, 4p, 5p, 8p?
Looking for 7-10 years system lifespan.
Can 10 battery packs (with BMS’s) be put in parallel without special equipment other than fuses?
I am planning on building an OFF GRID Powerwall that would consist of:
Ten 24V Battery packs of 64 32650 6ah cells each in an 8s8p configuration.
Each pack of 64 cells would have a DALY 8s SMART BMS (common port) handling up to ~100a (2c for a 6ah cells).
The cells in each pack would have screws and connect to 26 gauge copper plates in 8s8p. Each pack configuration would have a solid copper bus bar connection to a larger (¼ x 2in) copper bus bar that connects all 10 battery packs in parallel. These 10 packs should give me 12.25kw at 1C or 24.5kw at 2C (~ 900amps).
I was considering connecting this battery bank to (2 to 3) 24v Growatt 3Kva split phase SPF300TL LVM hybrid Inverters in parallel, (will also add 400watts PV to each Growatt unit).
Questions:
Is an 8s8p configuration too many cells for a DALY 8s BMS to manage reliably?
Or Should I configure 8s5p or 8s4p as packs, the idea here is longevity of cells, monitoring, and ability to replace cells easily. Specifically what is good parallel cell ratio for LFP 3p, 4p, 5p, 8p?
Looking for 7-10 years system lifespan.
Can 10 battery packs (with BMS’s) be put in parallel without special equipment other than fuses?