How many battery’s are too many
- Thread starter Khann
- Start date
Welcome to the forum.
"Wiring" in link #2 in my signature for best practices (turn phone sideways).
8S2P describes two 8S batteries in parallel, each with their own BMS. By your description, you meant, 2P8S meaning you have 8 cell groups comprised of 2 parallel cells each and one BMS.
Your 560Ah battery is limited by the current your BMS allows. Splitting the battery into 2X 8S batteries paralleled at the main terminals would double your current allowance and permit operational redundancy should a single cell fail. If a single cell fails in a 2P8S configuration, the whole cell group gets taken down. Assuming you catch it in time and the cell-mate doesn't get damaged, you're offline until you remove the offending cell and reconfigure for an 8S battery with 7 unused cells.
You can "safely" parallel as many as you like, but the BMS stays the limiting factor, and if ONE cell fails, now you have 3, 4 or 5, etc., cells being taken down by the offender.
If you want redundancy and the potential for higher current output, separate 8S batteries each with their own BMS is the more optimal solution. It also carries less risk for a single cell failure.
"Wiring" in link #2 in my signature for best practices (turn phone sideways).
8S2P describes two 8S batteries in parallel, each with their own BMS. By your description, you meant, 2P8S meaning you have 8 cell groups comprised of 2 parallel cells each and one BMS.
Your 560Ah battery is limited by the current your BMS allows. Splitting the battery into 2X 8S batteries paralleled at the main terminals would double your current allowance and permit operational redundancy should a single cell fail. If a single cell fails in a 2P8S configuration, the whole cell group gets taken down. Assuming you catch it in time and the cell-mate doesn't get damaged, you're offline until you remove the offending cell and reconfigure for an 8S battery with 7 unused cells.
You can "safely" parallel as many as you like, but the BMS stays the limiting factor, and if ONE cell fails, now you have 3, 4 or 5, etc., cells being taken down by the offender.
If you want redundancy and the potential for higher current output, separate 8S batteries each with their own BMS is the more optimal solution. It also carries less risk for a single cell failure.
WellAll or a lot?
I really like the Dacian’s SBMSO and i am trying to figure how to wire multiple SBMSO to mange separate Battery banks while using 1 PV array
Of course this is all just draft phase now and yes the ElectroDacus is in my opinion more complex then some of the plug and play systems out there
Just dreaming on what could be done
adriansantos
New Member
- Joined
- Apr 28, 2020
- Messages
- 45
I fully understand the BMS limitation. So regarding the maximum # of 3.2v cell to parrallel, is there is really no limit or recommended number of stacks?
Was planning to build a 24v 400ah system, using 4p8s of Sinopoly 3.2v batteries connected to 3kw 24v Snadi inverter. I wont be using the max 3kw, maybe 400-600 average (that would be around 25amps). Would paralleling 4 3.2v 100ah battery to make 400ah be ok?
saltcitysailor
New Member
- Joined
- Oct 19, 2021
- Messages
- 1
I have a similar question, albeit, different equipment so I thought I would tap into this thread instead of starting a new one.
I have 4 - 100 watt Renogy panels, a 40 amp Renogy Rover controller, a 2000 watt inverter, and 2 - 200 Ah Renogy AGM batteries. I built this system modeled after Will's "classic 400-watt solar package". This system is in my shed. The purpose is power for lights and to power misc. equipment from time to time, but also be an emergency backup when SHTF. When SHTF occurs, I want to be able to power fridge(s), cooking appliances like frying pans, and a small space heater (not all at the same time).
I live in Salt Lake City Utah with the following stats:
State Sunlight Rank: 10/50
Average Annual Sunlight Hours: 3000 hours
Clear Days: 125 days per year
Summer Peak Sun Hours: 6.09 hours per day
Winter Peak Sun Hours: 3.78 hours per day
Average Peak Sun Hours: 5.26 peak sun hours
source:
www.turbinegenerator.org
My question is, "Could/should I buy another battery to ensure I have enough Amp-hours to power items."
I do not want to wish I had bought another battery if it made sense to do it while I still had time and $$.
**I have read pages 20-23 of Will's book, but am still unsure.
I have 4 - 100 watt Renogy panels, a 40 amp Renogy Rover controller, a 2000 watt inverter, and 2 - 200 Ah Renogy AGM batteries. I built this system modeled after Will's "classic 400-watt solar package". This system is in my shed. The purpose is power for lights and to power misc. equipment from time to time, but also be an emergency backup when SHTF. When SHTF occurs, I want to be able to power fridge(s), cooking appliances like frying pans, and a small space heater (not all at the same time).
I live in Salt Lake City Utah with the following stats:
State Sunlight Rank: 10/50
Average Annual Sunlight Hours: 3000 hours
Clear Days: 125 days per year
Summer Peak Sun Hours: 6.09 hours per day
Winter Peak Sun Hours: 3.78 hours per day
Average Peak Sun Hours: 5.26 peak sun hours
source:
Utah | TurbineGenerator
Utah ranks in the top ten for average peak sun hours in the US. Solar insolation in general is highest in the Southwest regions of the United States. Installed solar capacity in Utah has skyrocketed in recent years and along with the other state of the region, has enough exposure to sunlight to...
www.turbinegenerator.org
My question is, "Could/should I buy another battery to ensure I have enough Amp-hours to power items."
I do not want to wish I had bought another battery if it made sense to do it while I still had time and $$.
**I have read pages 20-23 of Will's book, but am still unsure.
