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Your off-grid solar system will have one or more DC switchboards for the solar charge controllers. On the left of these panels, there's an MPPT-Battery DC Isolator.
Image 1
On the right there is a PV Array DC Isolator.
1. These isolators are connected or ON when in the "1" or "RED" position.
2. They are disconnected or OFF when in the "0" or "GREEN" position.
3. The MPPT Battery isolator disconnects the solar charge controller to the batteries for shutting down the system or for testing and maintenance.
4. The PV isolator on the right sometimes also has several pairs of string fuses. String fuses are used if there are more than 2 sets of solar panels connected in parallel.
5. The PV isolator is used to isolate power from the solar panels from the solar charge controllers on the board.
6. Isolating the panels from the charge controller is done as part of the shut down process or for testing and maintenance.
Image 2:
1. When wiring the system, the cabling from the panels comes to the top of the string fuses - or the top of the isolator if there is no string fuses.
2. Before turning the isolator ON you MUST check for the panel voltage and polarity at this point. Polarity will be marked and the maximum solar voltage will be indicated in your documentation. If there are any questions call our technical support line.
