Why does my solar storage tank keep overheating?

Overheating occurs when there is little hot water use in the home but the sun continues to heat the water. The controller will turn the pump off when the solar storage tank hits an upper limit (default 180F but often set lower to prevent scalding).

How does a solar water heating system work?

Some systems include a solenoid valve that will open to drain some water from the tank if overheated. Solar water heating systems that use only water as a heat-transfer fluid are the most vulnerable to freeze damage. "Draindown" or "drainback" systems typically use a controller to drain the collector loop automatically.

Why does a solar system rust?

The heat-transfer fluid in some solar energy systems can also provide a bridge over which this exchange of electrons occurs. Oxygen entering into an open loop hydronic solar system will cause rust in any iron or steel component.

Do solar water heating systems need insulation?

Solar water heating systems, which use liquids as heat-transfer fluids, need protection from freezing in climates where temperatures fall below 42ºF (6ºC). Don't rely on a collector's and the piping's (collector loop's) insulation to keep them from freezing. The main purpose of the insulation is to reduce heat loss and increase performance.

Does shading affect the performance of solar collectors?

Shading can greatly affect the performance of solar collectors. Vegetation growth over time or new nearby construction may produce shading that wasn't there when the collectors were installed. Dusty or soiled collectors will perform poorly.

Do solar energy systems need maintenance?

Solar energy systems require periodic inspections and routine maintenance to keep them operating efficiently. Also, from time to time, components may need repair or replacement. You should also take steps to prevent scaling, corrosion, and freezing.