9.5.4. Max PV output power relates to battery voltage
The output current of the solar charger is current limited to its rated current. This means that the output power will vary, depending
on the voltage of the battery.
For example:
A 75/15 solar charger has an output current rating of 15A. This is the current that is going into the battery. This means that if the
solar charger is connected to a 12V battery you will get less power into your battery than with a 24V battery.
• For a 12V battery this is 15A x 12V = 180W.
• For a 24V battery this is 15A x 24V = 360W.
So, although a 360 W panel is connected to the solar charger, it will not be able to output the same power into a 12V battery than
it will when connected to a 24V battery.
Example of differences in output power at different battery voltages
9.5.5. Mixed PV panel types
It is not recommended to connect a mix of different PV panel types to the same solar charger.
Only use solar panels that are the same brand, type and model.
9.5.6. PV connections burned or melted
Burned or melted PV cables or connections are generally not covered under warranty. In most case this is due to any of the
following reasons:
Solar cable
• Cables with rigid core wire or rigid strands used.
• Cables where the core wire has been soldered.
• Cable too thin - remember that the current will be higher when the PV voltage is lower. For more information on cable thickness
see the Wiring Unlimited book.
Screw terminals
• Loose screw connection.
• Cable insulation inserted too deep into the connector.
• Cables with rigid core wire or rigid strands used.
• Cables where the core wire has been soldered.
MC4 terminals
• Current has exceeded 30A per connector pair.
• Incorrectly crimped MC4 connectors.
• Bad quality MC4 connectors used
MPPT solar charger manual
Page 57 Troubleshooting and Support
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