Now, over 50,000 Sun Pumpers are in daily service around the world, satisfying company initiatives as well as doing more and costing less.
Photovoltaics are solid state semiconductor devices that convert light directly into electricity.
What can photovoltaics do?
Virtually any electric power need can be met by an appropriately designed PV power system. The only limitation is the cost of the equipment and occasionally the size of the PV array, although this is rarely a factor.
How is a system designed to provide required power?
Power requirements are designed using typical meteorological year (TMY) data for the location where the pump is located. Considering this data, a designed amount of autonomy is provided by batteries for continuous power at night and poor weather. There is always a the possibility that non-typical weather or "micro climates" may occur. If your application is critical, allowances in design need to be discussed.
What does PV cost?
Although this depends greatly on the application, (pressure, amount pumped, location) some general guidelines can be given. Smaller systems will be more expensive on a per-watt basis. Each watt of PV array will generally produce between 2 and 6 watt-hours of energy per day depending on the season and location. Some very dark locations (December in Alaska) will produce less energy and some very bright conditions will produce more energy that this range.
The life cycle cost of PV generated energy generally ranges for $0.30 to $1.00/KWH. This cost generally limits the current application of PV to areas that are not served by an existing utility grid.
Low power applications, such as the SUNPUMPER™ may be cost effective only a few feet from the power line.
Does PV work in the cold?
Yes, very well. In fact contrary to most people's intuition, PV actually generate more power at lower temperatures. Like most electronic devices, PV operates more efficiently at cooler temperatures. In temperature climates, PVs will generate less energy in the winter than in the summer, but this is due to shorter days, lower sun angles, and greater cloud cover, not the cooler temperatures.
Does it work in cloudy weather?
Yes, PVs do generate electricity in cloudy weather although their output is diminished. In general the output varies linearly down to about 10% of normal full sun intensity. Since flat plate PVs respond to a 180 degree window, they do not need direct sun and even generate 50-70% of their rated output under a bright overcast. A dark overcast might correspond to only 5-10% of full sun intensity, so output could be diminished proportionately.
How does the battery box and solar panel pole mount?
The battery box comes with mounting brackets and the panel pole can be mounted using the hose clamp.