Battery diagnostics (SP BMS)

Follow the below steps. 

1. Visual & Safety Check

• Inspect the casing for cracks, bulges, or leaks.
• Check connectors for corrosion or looseness.
• Make sure no cables are damaged before testing.

2. Voltage Check

• Use a use a voltmeter set to DC voltage mode.
• If the voltage is significantly below its nominal voltage (such as 10V on a 24V system), the battery may be faulty or deeply discharged.

3. Software check

1. Connect to the battery
   • If the battery can communicate:
     1. See if there are any active safety states (OV=overvoltage,UV=undervoltage)
        1. If in OV see if you can discharge the battery out of safety state
        2. If in UV see if you can charge the battery out of safety state 
        3. If the battery is bricked (both MOSFETs turned off) use unbricking tool
     2. Rule of thumb:
        1. If the battery only blocks discharge, try charging
        2. If the battery only blocks charging, try discharging

2. If the battery does not communicate
   • Use a variable DC power supply
   • PLEASE BE ADVISED: Keep continuous monitoring through PC software tool. If communication doesn’t return in 30–60 seconds, extended forced charging can be dangerous, and charge should be stopped.
     1. For 24V system set to 29V 1A
     2. For 48V system set to 54V 1A
   • See if the communication comes online again.

4. Capacity Check (Optional if the battery is functional)

3. Fully charge the battery.
4. Connect a known constant load.
5. Measure how long the battery lasts until it reaches the cut-off voltage
   • Capacity measurement
     1. A * hours = Ah (so for a 100Ah battery it should last for 10 hours at 10A discharge)
     2. Do the discharging test at 0,1C (100*0,1=10A)
   • Cutoff
     1. 24V system: around 21-23V depending on BMS settings
     2. 48V system: around 39V depending on BMS settings

5. If issues persist

1. Read out all logs
2. Screenshots from BMS software
3. Make a description of the issue with measurements
4. Contact WS Technicals with the information at: https://wstech.freshdesk.com/support/tickets/new