Why use 9V6W instead of 12V6W?

In reality, the sun will not always be strong, so under the same power, the voltage is low and the current is more sufficient. The actual sun is slightly weaker and the current 9V6W is about twice as large as 12V6W. When 12V6W can't start, 9V6W can work normally.

For general users, 2.5M head is completely enough, 3M head needs 12V with the same power, then the solar current can only be designed to be smaller, the weather is a little less, the water pump will not start, and the 9V6W water distribution pump can be directly exposed to the sunset or a little cloud shades the sun It can still work, but 12V6W basically can't.