Wiring solar panels in series requires connecting the positive terminal of a module to the negative of the next one, increasing the voltage. To do this, follow the next steps: Connect the female MC4 plug (negative) to the male MC4 plug (positive). Repeat steps 1 and 2 for the rest of the string.
Install CATCH Solar Relay as per the circuit diagram below. Power the device up and connect to it using the CATCH Power Configuration App on your phone or tablet. The Configuration App uses Bluetooth to communicate with the CATCH Solar Relay. Adjust the device settings to suit the installation. Maximum wire size for the Solar Relay is 2.5mm2.
The associated preset is adjusted such that the relay activates when the solar panel voltage is above 7 volts. The activation of the relay means the regulator circuit and the battery receive the voltage from the solar panel via the N/O contacts of the relay.
Contactor selection should be made based on load requirements. The solar relay requires the coil voltage to be 240VAC, with a maximum coil current of 4A. If the export control feature of CATCH Solar Relay is required then the CT must be installed. The CT can be positioned anywhere in the installation that sees all loads and solar.
Wiring solar panels together can be done with pre-installed wires at the modules, but extending the wiring to the inverter or service panel requires selecting the right wire. For rooftop PV installations, you can use the PV wire, known in Europe as TUV PV Wire or EN 50618 solar cable standard.
Wiring solar panels in parallel is achieved by connecting the negative terminal for two or more modules, while doing the same thing with the positive terminals. The process is the following: Take the male MC4 plug (positive) of the modules and plug them into an MC4 combiner.
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