Abnormal

Maybe the inverters are supposed to be mounted upside down.
 

Maybe the inverters are supposed to be mounted upside down.
 

Maybe the inverters are supposed to be mounted upside down.
 

Updated firmware (both main and display)
Plugged in cable and it works. Thanks guys.
 
I noticed the battery has made the following changes to the settings.
Max charging (02) current has been reduced to 10A I had it on 30A I assume it will now fluctuate based on the battery's state of charge it is currently full.
Float voltage (27) has been set to 53.2v I had it as 50.3v
Low cutoff (29) has been set to 47v, I was using 46.5v.
 
 
 
 

Managed to update both successfully using a laptop with a com port. Was pretty straightforward.
U03 version also changed when updating the Panel.
Old Versions
U01 - 71.50 U02 - 01.21 U03 - 00.21 U04 - 00.00 After updating the Panel it changed to 
U01 - 71.50 U02 - 02.00 U03 - 88.88 U04 - 00.00 After updating the the Main  firmware it changed to 
U01 - 71.86 U02 - 02.00 U03 - 88.88 U04 - 00.00

These have a quoted 1000 cycles at 50% DOD. Not bad - batteries with training wheels so to speak.
 These have no datasheet I would steer clear of them.

I have seen that these two batteries stipulate their end of life capacity using a different base of measurement. So I decided to do a comparison.
 
Pylontech USB2000D 2.4kWh usable 80% DOD
Usable capacity = 2.4Kwh * 80% = 1.92Kwh
Cycles at 80% DOD = 6000
End of life capacity after 6000 cycles at 80% DOD = 60%
End of life capacity = 2.4 * 60% = 1.44kWh
 
 
Pylontech USB3000D 3.5kWh usable 80% DOD
Usable capacity = 3.5Kwh * 80% = 2.8Kwh
Cycles at 80% DOD = 6000
End of life capacity after 6000 cycles at 80% DOD = 60%
End of life capacity = 3.5 * 60% = 2.1kWh
 
 
BDY 2.56kWh @100% DOD
Usable capacity = 2.56Kwh * 100% = 2.56Kwh
Cycles at 100% DOD = 6000
End of life capacity after 6000 cycles at 100% DOD = 80%
End of life capacity = 2.56 * 80% = 2.048kWh
 
Now BYD are publish the usable capacity which must mean that the total capacity of the battery must be more than their published numbers.
Assuming that their 100% DOD rating is actually only using 80% of the total battery capacity.
Then this mean that the total capacity is 2.56kWh / 80% = 3.2kWh
If after 6000 cycles the final capacity is 2.048kWh then
2.048kWh / 3.2kWh = 64%
So this means that their end of life capacity of the BYD is 64% of the total capacity
(or similarly the  Polytech end of life capacity is 75% of the usable capacity)
 
This makes them look very similar (in terms of cycles and remaining capacity)
Or of course I could be completely wrong, as i know just enough to make it dangerous 😊

I have seen that these two batteries stipulate their end of life capacity using a different base of measurement. So I decided to do a comparison.
 
Pylontech USB2000D 2.4kWh usable 80% DOD
Usable capacity = 2.4Kwh * 80% = 1.92Kwh
Cycles at 80% DOD = 6000
End of life capacity after 6000 cycles at 80% DOD = 60%
End of life capacity = 2.4 * 60% = 1.44kWh
 
 
Pylontech USB3000D 3.5kWh usable 80% DOD
Usable capacity = 3.5Kwh * 80% = 2.8Kwh
Cycles at 80% DOD = 6000
End of life capacity after 6000 cycles at 80% DOD = 60%
End of life capacity = 3.5 * 60% = 2.1kWh
 
 
BDY 2.56kWh @100% DOD
Usable capacity = 2.56Kwh * 100% = 2.56Kwh
Cycles at 100% DOD = 6000
End of life capacity after 6000 cycles at 100% DOD = 80%
End of life capacity = 2.56 * 80% = 2.048kWh
 
Now BYD are publish the usable capacity which must mean that the total capacity of the battery must be more than their published numbers.
Assuming that their 100% DOD rating is actually only using 80% of the total battery capacity.
Then this mean that the total capacity is 2.56kWh / 80% = 3.2kWh
If after 6000 cycles the final capacity is 2.048kWh then
2.048kWh / 3.2kWh = 64%
So this means that their end of life capacity of the BYD is 64% of the total capacity
(or similarly the  Polytech end of life capacity is 75% of the usable capacity)
 
This makes them look very similar (in terms of cycles and remaining capacity)
Or of course I could be completely wrong, as i know just enough to make it dangerous 😊