Posted By jonr on 27 Aug 2014 10:48 AM My guess is that it is a brushless DC centrifugal pump and would work with 100+W panels that don't exceed 24V. Or you can use a DC-DC converter to provide exactly 24V (full output) under a wide range of conditions (> 32V panels would be a good choice). The link above appears to be a poor fit for what you need.