Good day to all,

I have connected a SHOTO SDA10-48100L5 battery to my Sunsynk inverter. Initially it had an error, but eventually started up and is working now for the past week.

There is no connection to the battery bms. I am using inverter values in Solar assistant.

My power draw never exceeds 600w from the battery.

Could anyone give me the correct values concerning battery charge and work mode settings.

The battery is second hand and I do not have a manual. There is a lot of conflicting info on the internet.

Any help will be greatly appreciated..

Your settings look conservative compared to the 15s version below:

Not sure if you have seen this link on the forum ?

from Page 16 of the manual ;

Uploading Attachment...

27 minutes ago, Arandoza said:

Not sure if you have seen this link on the forum ?

from Page 16 of the manual ;

Uploading Attachment...

Thank you for the feedback.

Do I go with the left or right, which values go where?

On the left top picture.

Boost charge=Battery absortion, so 54,v?

Float charge=battery float charge, 52,5 (seems obvious because the wording do match)

Equalization= 52,5? or 54v?

On the right top picture. Minimum- 53,2 Typical- 56,4 Maximum- 57,5.

Got this on AI overview.

The maximum voltage for a Shoto SDA10-48100L5 (15S LiFePO4) battery is

56.4V. This equates to a maximum cell voltage of approximately 3.76V per cell.

The recommended bulk/boost charging voltage is generally 54.0V–54.5V. 

Key safety and performance details for the Shoto SDA10-48100L5:

• Battery Type: 15S LiFePO4

• Operating Voltage Range: 40V–56.4V.

• Maximum Charge Voltage: 56.4V.

• Recommended Charge Voltage: 54.0V–54.5V.

• Maximum Charging Current: 100A. 

With all this info, can someone tell me exactly what values to input in the bottom 2 pictures to charge the battery correctly, balance the cells and to make it last as long as possible?

I know to some members this will look obvious which values go where.

I am being very careful because I lost a Pylontech battery (R25000.00) gone, and it was connected via BMS, but got swollen and lost all capacity.

2 hours ago, Arandoza said:

Not sure if you have seen this link on the forum ?

from Page 16 of the manual ;

Uploading Attachment...

The SHOTO SDA10-48100L5 battery is primarily a 16S (16-cell, 51.2V) configuration, providing a 5.12kWh capacity. However, there are older or different versions of the SDA10-48100 model that are 15S (15-cell, 48V), making it crucial to check the specific, label or technical specifications for voltage. Please confirm that you have 16S version then we could advise specific settings.

@Warlok The manual refrence to the nominal and maximum charge voltage for 15s is incorrect and also the maximum charge voltage for 16s. See above marked in red the incorrect charge voltages. For example typical charge voltage for 15s= 56.4v÷15= 3.76v/cell way above maximum of 3.65v/cell for lfp. Same with max charge voltage for 16s 60.4v/16 = 3.775v/cell even worse.

Like I said confirm the cell count and we will assist with settings.

31 minutes ago, Warlok said:

it was connected via BMS, but got swollen and lost all capacity.

Manual voltage settings can't beat direct BMS integration. Sunsynk comms does support Shoto batteries. I would set the charge voltages high, and monitor the BMS charge current. Once this gets close to 0A, use that voltage value for the charger settings but still keep the CAN connection.

8 hours ago, frivan said:

Manual voltage settings can't beat direct BMS integration. Sunsynk comms does support Shoto batteries. I would set the charge voltages high, and monitor the BMS charge current. Once this gets close to 0A, use that voltage value for the charger settings but still keep the CAN connection.

Yes the 1st statement is true until the BMS fails and one does not see it early. Just look at the cycles under BRANDS LBSA how well @Antonio de Sa batteries are doing using voltage control.

11 hours ago, Scorp007 said:

Yes the 1st statement is true until the BMS fails and one does not see it early. Just look at the cycles under BRANDS LBSA how well @Antonio de Sa batteries are doing using voltage control.

@Scorp007 @frivan

To me it makes no sense charging the batteries to full cell voltage all the time.

Why stress the battery for just a couple of AH.

My battery is rated 56 V so individual cell should be charged to 3.5 V.

That is exactly what I do.

And the cells get to equalizing value.

See dashboards.

Edited February 23Feb 23 by Antonio de Sa

7 hours ago, Antonio de Sa said:

My battery is rated 56 V so individual cell should be charged to 3.5 V

3.4V, 3.7V... I don't mind but the BMS should enforce the value and protect each cell.

1 hour ago, frivan said:

3.4V, 3.7V... I don't mind but the BMS should enforce the value and protect each cell.

Any BMS will protect the cells that is the primary function. Should you use voltage control or communication to the inverter the BMS cell protection is always active. So the cells would never see 3.7v the BMS will go into Ovp and shut the battery down. If voltage control is preferred just ensure the inverter is set with Oem battery specifications. @Antonio de Sa i agree with your battery voltage settings 3.5v is in die upper knee of the lfp curve not much capacity beyond that voltage so no need to stress the cell by charging to 3.65v. Good recipe for longevity.

16 hours ago, TaliaB said:

Any BMS will protect the cells that is the primary function. Should you use voltage control or communication to the inverter the BMS cell protection is always active. So the cells would never see 3.7v the BMS will go into Ovp and shut the battery down. If voltage control is preferred just ensure the inverter is set with Oem battery specifications. @Antonio de Sa i agree with your battery voltage settings 3.5v is in die upper knee of the lfp curve not much capacity beyond that voltage so no need to stress the cell by charging to 3.65v. Good recipe for longevity.

@TaliaB 100% correct, the BMS regardless of been in voltage mode or communication mode will always protect the cell from going overvoltage.

And as you said no use going over 3.5 V max charge and rest at 3.2 V, the proof is that my battery 4 1/2 yeas old over 2600 Cycles still show 100% health and charge to 102 AH of rated 105 AH

6 hours ago, Antonio de Sa said:

BMS regardless of been in voltage mode or communication mode will always protect the cell from going

I don't see voltage control and communication as being equal. If a cell in the battery has lost capacity, the BMS can reduce charging rate to accomodate this cell with communication. Without communication, the BMS has to make the battery go open circuit to protect the cell. The latter seems more crude.

5 hours ago, frivan said:

I don't see voltage control and communication as being equal. If a cell in the battery has lost capacity, the BMS can reduce charging rate to accomodate this cell with communication. Without communication, the BMS has to make the battery go open circuit to protect the cell. The latter seems more crude.

Do I understand correctly that if one cell has lower capacity the BMS with comms would slow down charging of the other 13/14/15 cells in order to help this weak cell?

Would the weak cell not in any case even at low charge rate go into OV and then the BMS will still open circuit the battery even with comms?

21 hours ago, Scorp007 said:

Do I understand correctly that if one cell has lower capacity the BMS with comms would slow down charging of the other 13/14/15 cells in order to help this weak cell?

In another thread I posted my battery charging. The battery is only used for backup purposes. It charged to 90%, then after 20 minutes the BMS decided it isn't at the required SoC and initiated another short charge.