Short answerA solar fountain pump is a tiny direct-drive centrifugal pump: it runs only in direct sun, stops when a cloud passes unless it has a battery, and its rated lift height is the height at which flow falls to zero. Put the panel in full sun, keep the intake filter clean and bring it in before freezing weather.
Key takeaways
- No sun, no water, unless the kit has a battery.
- Rated lift height is where flow reaches zero.
- Clean the filter weekly in summer and bring it in before frost.
Three facts that explain most complaints
- No sun, no water. A small panel wired straight to the pump has no store of energy. Shade, cloud, a dusty panel or a low winter sun stops it.
- Lift height is a maximum. It is the height where flow reaches zero, the same idea as maximum head on a well pump. A useful spray reaches well below it. See reading a pump curve.
- Tiny pumps clog. Leaves and algae block the intake screen within days in a busy birdbath or pond.
Getting more from one
- Use a model with a separate panel on a cable, so the panel sits in full sun while the fountain sits where you want it.
- Choose a battery model if you want it to run in the evening or through passing cloud; the battery adds hours, not power.
- Rinse the filter weekly in summer and keep the water topped up: running dry damages the pump.
- Bring it indoors before freezing weather. Ice cracks housings.
When you need a real pump
A fountain kit moves a few gallons a minute at a foot or two of lift. Filling a stock tank, aerating a fish pond or watering a garden needs a pump sized for the job: see pond aeration and fountains and the sizing calculator.
Questions
- Why does my solar fountain keep stopping?
- Usually because the panel is not in direct sun: shade, a passing cloud, dust on the panel or a low sun angle drops its output below what the pump needs to start. A clogged intake filter is the next most common cause.
Next step
When a pond needs an aerator rather than a fountain, and why it runs at night.