9
2.3 Wiring details
WARNING
•
For user safety during installation, please make sure that the output of the supplying
PV source is switched off (open circuit breaker in the PV supply lines or protect the
solar panels from light by covering these). Also remove the fuse from the output
battery positive line.
•
The wiring example in this chapter is primarily intended as a functional one. Always
check your local regulations, codes and requirements for installing a solar charger.
•
Make sure that all PV and battery screw terminal connections are strongly tightened
(2
–
2.5Nm)
•
For detailed PV and solar charger grounding schemes and ground fault detection
implementation, please follow your local electrical regulations.
!
CAUTION
•
To avoid solar charger damage, please check if the maximum open circuit voltage
(Voc) of a series string of PV panels, does not exceed the maximum input voltage of
the solar charger. Please take into account that Voc increases as the temperature
decreases. Typically, Voc is 10% higher at 0°C compared to the often rated 25°C
value. It can even rise to +25% at extremely low temperatures down to -40°C.
•
Please double check if the battery voltage matches the specifications of the used
charger model
•
Please double check the polarity of the PV source as well as the battery. Long term
reverse connection of the battery, may damage the solar charger.
•
Ground the frames and mounting racks of your PV panels to reduce the chance of
lightning damage. Do not connect the positive or negative PV wires to ground.
The image below shows a general wiring example of the solar charger. The main PV and battery
connections are indicated by a number (1 to 4). It is very important to exactly follow this wiring order
to avoid solar charger and/or battery damage. The wiring order is:
1.
Battery positive cable
2.
Battery negative cable
Then wait 3 seconds for proper automatic battery voltage detection (see chapter 3.1)
3.
PV positive cable
1)
4.
PV negative cable
1)
1)
When a double pole switch is installed in the PV lines, both positive and negative cables are of
course allowed to be switched on simultaneously.
