Hi,

Been searching for a while but can’t quite get the answer.

I have a multiplus II (5kVa) installed with 3x 3000C Pylontec batteries. The system has been running with only 2 of the batteries since installation as the one battery cable was dead on arrival.

The replacement cable has arrived and would really want to connect the other battery without having to wait for the installer.

How difficult is it to install the third battery - Will I need to make any changes to the settings on the inverter ? Physically connecting the battery seems easy enough. 

Thanks everyone   

Its pretty easy... Disconnect the load, switch the inverter system and finally switch off each battery module. Disconnect the batteries bank from the inverter, usually there is a DC breaker for this/ 

Follow this connection diagram below as per the manual. Don't forget to connect the link cables between each module. Power them all up, press the SW switch on the master and the LED's on the Master will light up, release SW switch. Each module will then power up in sequence. Close the DC breaker, switch on Inverter, then check if all is good. If no issues, connect the load, then you good to go. 

6 hours ago, PurePower said:

Its pretty easy... Disconnect the load, switch the inverter system and finally switch off each battery module. Disconnect the batteries bank from the inverter, usually there is a DC breaker for this/ 

Follow this connection diagram below as per the manual. Don't forget to connect the link cables between each module. Power them all up, press the SW switch on the master and the LED's on the Master will light up, release SW switch. Each module will then power up in sequence. Close the DC breaker, switch on Inverter, then check if all is good. If no issues, connect the load, then you good to go. 

Thank you - I got the connection part down. Although - I do see that my "cable 11" is on the other positive connection of Battery 1. My cable 10 is also on the other negative connection of the last battery.

Do I need to change anything with regards to the settings on the inverter? Or is this just a plug and play situation ?

After balancing the batteries and connecting the new one. I flipped the switches and everything seems fine. Cant figure out how to view the state of individual batteries on the Victron - so I assume everything is fine.

Thanks for the help. Take Care. 

11 hours ago, Magic said:

Thank you - I got the connection part down. Although - I do see that my "cable 11" is on the other positive connection of Battery 1. My cable 10 is also on the other negative connection of the last battery.

Do I need to change anything with regards to the settings on the inverter? Or is this just a plug and play situation ?

After balancing the batteries and connecting the new one. I flipped the switches and everything seems fine. Cant figure out how to view the state of individual batteries on the Victron - so I assume everything is fine.

Thanks for the help. Take Care. 

I'm not all clued up with the Victron interfacing with the BMS of the battery, but it should just be plug and play and the Batteries BMS will share the relevant info to the inverter to apply. 

I do know that Victron shows the total SOC, not sure about SOC for individual batteries?

Edited May 27, 20215 yr by PurePower

On 2021/05/25 at 5:29 PM, Magic said:

Hi,

Been searching for a while but can’t quite get the answer.

I have a multiplus II (5kVa) installed with 3x 3000C Pylontec batteries. The system has been running with only 2 of the batteries since installation as the one battery cable was dead on arrival.

The replacement cable has arrived and would really want to connect the other battery without having to wait for the installer.

How difficult is it to install the third battery - Will I need to make any changes to the settings on the inverter ? Physically connecting the battery seems easy enough. 

Thanks everyone   

You should charge the 2 existing batteries to 100% then disconnect them from the inverter and charge the new one to 100% by itself. Then join the 3 batteries in parallel, switch them on and let them equalise for a day (but not connected to the inverter yet), then connect them to the inverter and discharge them to 50% and recharge...Over a few days the batteries will equalise. If you dont do this the batteries will all be at a different state of charge and you will pick up errors on charging.