Hi,

 

Below my batt specs:

Battery Specifications:
- Battery Type-Chemistry: LiFePO4
- Nominal Voltage: 51.2V
- Nominal Capacity: 106Ah
- Energy Density: 5427.2Wh
- Terminal Type: M6
- Terminal Torque: 8.5NM
- Case Material: Metal
- BMS Built-in: Yes
- Internal Resistance: - Efficiency - Round Trip: >99.5%
- Self Discharge per Month: - Max Parallel Connectors: 16Pcs
- Series Connections: Not Allowed
- Cycle Life(0.2C, 25 C @ 80% DOD): >4000 Cycles
- Discharge Temperature: -20 C to 65 C
- Charge Temperature: 0 C to 45 C
- Storage Temperature: -10 C to 30 C
- Voltage Window: 44.8 - 57.6V
- Recommended Charge Voltage: 57.6 0.20V
- Max Charge Voltage: 58.4 0.20V
- Recommended Charge Current: 50A
- Max Continuous Charge Current: 100A
- Recommended Discharge Voltage: 44.8 0.20V
- Max Discharging Voltage: 43.2 0.20V
- Max Continuous Discharge Current: 100A
- Peak Discharge Current: 120A (5s 2s)
- Dimensions: L 566 x W 402 x H135 mm
- Weight: 47Kg

 

Question:

I want to maintain a lowered SOC state as to not have the battery sit at 100%, trying to keep between 95 and 20%

 

The 20% isnt a concern but I also want to ensure I dont strain the battery through charging.

physical charge time is not and issue as well, can be quick or slower, but what is best for the battery.

I Cant set a no float option, so herewith my real question.

 

Would the below be okay?

1. Bulk charge 57.6V as recommended

2. Float charge 54.0V lower than the 54.4 recommended

3. Max charge 10A

4. Max AC charge 2A

5. To mains 51V (solar first setting)

6. Back to battery Full (Solar first setting)

7. Cut off 48V

Edited April 24, 20233 yr by Eurard
Changed setting

Due to me posting over the weekend, it might have fallen a bit low.

Anyone that can check?

18 hours ago, Eurard said:

Bulk charge 54.5V

If you have a 16 cell battery then that low voltage of 54.5 (3.4v per cell) may not be enough for the bms to do balancing.
Find out what the balancing start voltage is and then set it to just above that level.

10 minutes ago, WannabeSolarSparky said:

If you have a 16 cell battery then that low voltage of 54.5 (3.4v per cell) may not be enough for the bms to do balancing.
Find out what the balancing start voltage is and then set it to just above that level.

Was about to update, I changed this last night to Bulk 56.7V

 

16S? I thought I had a 14S (51.2V)

Edited April 24, 20233 yr by Eurard

13 minutes ago, Eurard said:

16S? I thought I had a 14S (51.2V)

Nominal voltage per cell is 3.2V for LFP. 51.2/3.2=???

22 minutes ago, P1000 said:

Nominal voltage per cell is 3.2V for LFP. 51.2/3.2=???

Ag im an idjit, looking a Li Ion and not LiFePO4.

 

Thanks!

So the raised 57.6V, should be fine yeah as recommended

Foat at 54 rather than the 54.4 recommended as I dont want the batt to rest at 100%

 

 

Edited April 24, 20233 yr by Eurard

Hi all I have the Svolt lithium battery but last night the battery red light came on and the inverter is now bypassing the battery. Any idea what may have caused the Alm red light to come on.