Installation Instructions - Qualified
Electrician
General information
Model: SOLAR SWITCH BOX E8 -4/A4/G2
What is the SSB and what does it do ?
The solar switch box (SSB) connects the 8 SRT strings (12
SRT = 1 string) At this stage the string voltage is under
a harmless 75 V DC.
SSB Construction:
CE, safety
class system II, system voltage 300 V DC suitable for indoor humid conditions,
flame retardent 180x130x35 mm housings with transparent
cover, SSB for 96 SRT (1kWp)
The Electrician
The electrical installation may be only carried out by a
licensed electrician.
The electrician is responsible for the installation from
the solar switch box to the grid. He must know all
the regulations, stipulated by the power company, in
regard to grid connected pv installations.
The Electrical Check
The electrician is required to make an electrical check
before the installation starts.
He will..
- Specify the ideal DC connection between the solar
switch box and inverter (check your inverter manual from
the manufacturer). Note: The inverter must be installed
as close as possible to the solar switch box and should
be located in a well ventilated place, protected from
light and humidity.
- Determine the best AC connection between the inverter
and the power grid, and also know all the necessary
equipment recommended by the regional power company, like
electric meter, safety fuses, ENS de-energizing devices
etc.
- Inform your power company about the pv
installation.
- Submit an application for any subsidies offered by
your power company or regional authorities.
Solar Switch Box Installation
The SSB is already mounted under the roof by the roofer
near the cable inlet. This must be a dry, accessible
place without direct exposure to the sunlight.
The SSB is not allowed to be opened by anyone other than
a qualified electrician.
If a string (12 SRT) is correctly assembled and
connected, the appropriate red indication lamp will light
up inside the SSB (only during daylight hours). All 8
lamps should be lit up before continuing.
Electrical Assembly
First check in the inverters manual what the input
voltage level is:
120 Volt or 240 Volt. (open circuit voltage of the pv
generator)
The cover of the SSB is opened.
To measure the voltage of the strings follow the diagram below.
Click on the image for a detailed view
The necessary voltage level is then achieved by bridging.
Note: the bridges can be supplied with the SSB upon
request, or made easliy by yourself from cable lengths.
This diagram below shows two of the bridge configurations
possible.
Click on the image for a detailed view
240 VDC/6A
Bridges B-E; C-F; D-G
Output cable 2, 5mm²
120 VDC/12A
Bridges A-B; C-D; E-F; G-H; D-E
Output cable 4mm²
Output cable terminals:
A: - minus
H: + plus
After the bridges have been correctly configured it is
important to close and secure the SSB. This is done by
the removing the housing screws, this will prevent any
"toolless" entry by unauthorized persons.
Multiple SSB's must be switched in parallel.
We recommend connecting the SSB to the DC main cable
through an additional case (commercial standard, and not
supplied), since the output terminals of the SSB are only
suitable for cables up to 4mm². The DC cabling to
the inverter can have a substantially greater diameter,
this prevents voltage loss over longer distances. This
can only be determined when the distance from the SSB to
the inverter is set and calculated.
Documentation is important during the installation. All
necessary warning signs and circuit labels must be done
and conform with the use of a grid connected pv
installation.
Establish the AC installation by the information gathered
by the electrical check. (electric meter, AC
de-energizing device, etc..) Install the inverter
following the regulations and the operating and assembly
instructions from the inverter manufacturer.
Lastly inform your power company about the installation.
Last updated: 13:03:03 all subject to change without
notice