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Hello, I have the MPPT 75/10 Victron solar charger. When I shoot voltage straight from my 100wpanel I am getting 20volts. When those wires are connected to controller it drops and caps at 12volts according to the app and multimeter. It never goes above 12volts. How can I fix this so the solar controller will charge my 12v battery
When you put a load on your solar panel, the voltage will drop (this is normal). For it to go from 20V to 12V sounds like a lot. I would check the wiring as well to make sure you do not have a loose connection at the MPPT terminal that is causing the voltage to drop. If you connect the Panel to the MPPT, you can check in the Victron Connect App (if the MPPT is smart) and see what the voltage is at the MPPT. If it is 12V at the MPPT, you may have a voltage drop in-between the Panel and the MPPT causing this. Best option is to use a voltmeter at each connection point to see where you lose the voltage.
You can also disable the MPPT charger in settings. This way, the MPPT should be reading close to OCV (and therefore close to the 20V you read directly at the panel).
Below is a link to a nice video about this that can be helpful.
One solution would be to add a second panel in series to increase voltage.
https://www.youtube.com/watch?v=uTMVmW7GTus
Thanks
To me it may be my settings could be messed up but not sure. Wiring seems ok leading up to solar panel as I am getting 20 volts however connecting those wires I shot 12 volts and it never goes above that in full sunlight
