Calculating Gallons Per Minute (GPM) water flow

For our solar pool project, we wanted to calculate the Gallons Per Minute (GPM) Flow Rate that our 12 Volt pump was producing. As well, we found out what the temperature of the first gallon would be coming directly from the solar water heater.

To Calculate GPM, we used the following formula..

(Number of gallons filled / Time in seconds to fill gallon) x 60

So in our case, we end up with the following equation=
1 gallon / 23 seconds = 0.0434,
0.0434 x 60 = 2.604, or roughly 2.6 GPM

The pump produced 2.6 GPM of 113F water to our pool from the solar water heater, in the first gallon. Obviously that temperature won't sustain as the pump runs longer, so our next experiment is to track the temperature loss over a period of time to determine the best way to optimize our system. Stay tuned!