suncatcher Posted April 29, 2022 Posted April 29, 2022 I recently added a Pylontech US3000C to my existing battery bank of 8 Pylontech US3000B Batteries. It is my understanding (confirmed by supplier) that they can all work together in a stack of up to 16 batteries as long as the US3000C is the master. In the process, I initially did not have the right length cables to connect all 9 batteries, so I simply replaced the original US3000B master with the new US3000C thus ending up with the 8 batteries and US3000C as master. (9th not connected yet). All working fine. Then a day or so later, I got all the right length cables and added the 9th battery to the bank (previously the US3000B master). Now when trying to synchronize them all with the SW button (US3000C still the master) it keeps running through the synch cycles and eventually I get the solid red Alarm on the master. If I exclude the 9th battery, all is fine again. Before introducing the new battery, all was working well so doubt it is now faulty. I was thinking maybe the SOC of the last added battery is different, thus causing the alarm, but not sure now. My ADD switch on master is set to On for 1 and off for the rest so the inverter can connect to the batteries. ADD switches for all slaves are off. Does anyone have some advice or guidance on what may be causing this? Quote
Nexuss Posted April 29, 2022 Posted April 29, 2022 Make sure all the batteries are running their latest version of firmware ,that solved the issue for me . Also the ADD switches should all be off,masters link port 0 is open. Quote
suncatcher Posted April 29, 2022 Author Posted April 29, 2022 Thanks for the response. I shall check the firmware. How does one then update the software? Is there a link somewhere to download + instructions. Quote
Tinbum Posted April 30, 2022 Posted April 30, 2022 (edited) Look at the instruction manual for the US3000C it clearly states the order the batteries have to be in. Then you will see why it doesn't work with the 9th battery.Your supplier was not totally correct. Edited April 30, 2022 by Tinbum Quote
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