question

alfa avatar image
alfa asked

2 Victron Quattro's in split phase not starting

Hi,

I have finished installing 2 Quattro's 48/3000/35-50/50 in split phase with 2 each 48V EG4-LL battery in parallel. As soon I'm switching on the batteries I'm getting error on the 2 batteries, "protected (DOC)" discharging over current protection and the Quattro's doesn't start, not even one at the time. I disconnected the DC (+) from one of them and it's working, I done the same with the 2nd one and it works as well. So the system works with only one but not with the 2 Quattro's connected at the same time to the DC Victron distributer. I Don't know if this have to do with my problem, the firmware are not the same on boot, they are the 27xxx one is the 430 and the 2nd is 481. Please help. Thanks Dan

split phase
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
Kevin Windrem avatar image
Kevin Windrem answered ·

All inits in a multi-phase or parallel system should be on the same firmware. That could be your problem.

The batteries may not be able to handle the current surge when connecting the Quatros. You should consider adding a soft start circuit that allows the capacitor across the Quatro's DC inputs to charge slowly. The discharged capacitors act as a direct short for a split second. That may be more than the BMS for your batteries will tolerate. One Quatro by it self may be within the BMS surge rating.

2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

alfa avatar image alfa commented ·
Kevin, Thanks for the reply. Can you point me to a “soft start circuit that allows the capacitor across the Quatro's DC inputs to charge slowly”.
0 Likes 0 ·
Show more comments