Fronius Symo 10-20 kW - Manual (Page 15)

13
EN
Connecting alu-
minum cables The DC-side terminals are designed for connecting single-wire, round aluminum cables.
The following points must be taken into account when connecting aluminum cables due to
the non-conducting oxide layer of aluminum:
-
Reduced rated currents for aluminum cables
- The connection requirements listed below
Connection Requirements:
Carefully clean off the oxide layer of the stripped end of the cable, e.g., using a knife.
IMPORTANT Do not use brushes, files or sandpaper. Aluminum particles may get stuck
and can transfer to other cables.
After removing the oxide layer of the cable end, rub in a neutral grease, e.g., acid- and
alkali-free Vaseline.
Then immediately connect it to the terminal.
Repeat the steps above whenever the cable is disconnected and then reconnected.
Inverter DC con-
nection
The difference between the individual solar module strings must not exceed 10 V.
NOTE! Take into account local specifications when configuring cable cross sec-
tions.
1
2
3
0 - 2000 m: U DCmax 1000 V
2001 - 2500 m: U DCmax 950 V
2501 - 3000 m: U DCmax 900 V
3001 - 3400 m: U DCmax 850 V
> 3400 m
+ / -
CAUTION! Risk of possible dam-
age to the inverter! Check the po-
larity and voltage of the solar
module strings before making the
connection. The voltage must not
exceed the following values:
-
when installed between 0 and
2000 m above sea level: 1000
V
- when installed between 2001
and 2500 m above sea level:
950 V
- when installed between 2501
and 3000 m above sea level:
900 V
- when installed between 3001
and 3400 m above sea level:
850 V
NOTE! Only break out as many target break points as the number of cables that
are provided (e.g. if there are 2 DC cables, then break out 2 recesses).