PV Combiner Box selection:
- Confirm the DC side system specifications: clear the system is composed of several MPPT, the inverter is several MPPT, each series of MPPT working conditions. (every list of current voltage)
- Understand the parameters of the components in the system: power differences of different components on the market, single glass components or double glass components of output current. Current selection (fuse)
- Understand the system voltage: conventional 600 v system about 10 ~ 12 pieces to a string, about 20 ~ 22 1000 v system components as a string. (system voltage selection)
- Fuse choice: dc fuse rated current is greater than or equal to 1.5 times the pv group list of short circuit current.
- Surge protection: nominal discharge current In greater than or equal to 20 ka, at the same time should have status indication function.
- The choice of the isolator: photovoltaic isolator shall meet the non-polarity function (photovoltaic phalanx of fault current will cause the current in the opposite direction, the isolator can normal action), the isolator can be isolating switch, can also be a circuit breaker.