I have a 7s 30p that i put together with new cells, has been running well for over 2yrs with a JBD 60 Amp BMS it runs 24v dc pumps and controls for solar and wood heating.
I'm now looking to increase my capacity with a secondlife battery. To run a fridge in the summer, through an inverter, when i have excess solar power and possibly other 220v appliances. When the system was on Lead/Acid cells I had no problem with the load surge of the inverter it was just the DOD that i had to monitor.
Now I'm looking at the spec for the inveter and it states 120amp fuse on the DC supply to run the inverter at full potential. 1500w con 3000w surge.
The fridge that im looking to run is 0.49 Amp nominal an 85 kwh per annum so doesn't need anything near the full capacity of the inverter but starting surge is high.
So Im thinking of running 3x 60A JBD BMS in parallel
I have 700 cells at 2200mah - 2500mah
So 700/15 = 46P per pack to make 2 x 7S 45P to add in parallel to my existing 7S 30P PW.
I know i will have to be careful if one of the packs cuts out before the others, so was thinking 40Amp MCB between each BMS and the inverter.
Any thoughts or experiances?
Thank you
I'm now looking to increase my capacity with a secondlife battery. To run a fridge in the summer, through an inverter, when i have excess solar power and possibly other 220v appliances. When the system was on Lead/Acid cells I had no problem with the load surge of the inverter it was just the DOD that i had to monitor.
Now I'm looking at the spec for the inveter and it states 120amp fuse on the DC supply to run the inverter at full potential. 1500w con 3000w surge.
The fridge that im looking to run is 0.49 Amp nominal an 85 kwh per annum so doesn't need anything near the full capacity of the inverter but starting surge is high.
So Im thinking of running 3x 60A JBD BMS in parallel
I have 700 cells at 2200mah - 2500mah
So 700/15 = 46P per pack to make 2 x 7S 45P to add in parallel to my existing 7S 30P PW.
I know i will have to be careful if one of the packs cuts out before the others, so was thinking 40Amp MCB between each BMS and the inverter.
Any thoughts or experiances?
Thank you