anbeng
Members
-
Joined
-
Last visited
Reputation Activity
-
dont use this circuit breaker on solar system ! very dangerous
-
anbeng reacted to NigelL in OK to connect parallel PV strings without fuses?I am planning on having 9 x 330W panels installed as 3 parallel strings of 3 panels in series. I have calculated that this combined array will have a worst-case short-circuit current of 28.6A at max temperature.
The solar installer has said that they will use cascaded MC4 "Y" connectors to parallel the strings together under the panels - without any fuses between the strings. The combined array will connect to the DC-DB via two 6mm^2 cables (plus extra earth cable). The DC-DB will then just have a single fuse in each of these PV cables. The cable run is about 16m - 18m.
I thought that one must have individual fuses for each string - both for safety reasons and for obtaining a CoC. In this case it would make more sense to route 6 thinner cables (e.g. 4mm^2) to the DC-DB where one would do the combining/fusing and surge protection.
Am I just being over-cautious?