18650 14S 90P (48 volt 13.7Kwh powerwall)

[ripcurldog]

I've built a powerwall using recycled 18650 cells (Panasonic NCR18650BD) which are rated at 10amps discharger and 1.5amp charge (per individual cell). They are configured as a 14S 90P = 48volt pack (approx. 13.9Kwh). My question is, at what charge rate should I set my inverter. What would be a high, a medium and a low charge rate? I am currently charging at 30amps, occasionally ramping it up to 40amps. I charge to 55volts and back discharge to 49 volts. (this is enough of a charge to run six of our most important circuits via a manual transfer switch, during peak hour for about 6 hours at night).

Thanks,

 

[OffGridInTheCity]

If you look at the specs for these cells - https://batterybro.com/products/panasonic-bd-ncr18650bd-3200mah-10a

You see a 'standard charge' current of 1.25a. At 14s90p, that 90 * 1.25a = 112a @ 48v of charging is OK (standard).

If you divide a charging current of 40a by 90p you get 444ma/cell (or 0.444a/cell). 40a charge won't be a problem

 

[ripcurldog]

If you look at the specs for these cells - https://batterybro.com/products/panasonic-bd-ncr18650bd-3200mah-10a
View attachment 82286
You see a 'standard charge' current of 1.25a. At 14s90p, that 90 * 1.25a = 112a @ 48v of charging is OK (standard).

If you divide a charging current of 40a by 90p you get 444ma/cell (or 0.444a/cell). 40a charge won't be a problem

Thanks!