Hello, I am putting together a motorhome and I want to put 3 round 9w LED panels and power them with the 12v battery, the panel driver says that the output is 12v, but when connecting it to the battery it did not work, I measured the driver's output with the connected panel and it was 20v, would I be needing to raise the voltage, could you provide me with some scheme of coun circuiton its components? From already thank you very much, greetings.