How do you compare different solar panels? You measure the wattage power per panel. number of Watts Output when it is illuminated under standard conditions of 1000 Watts/meter2 intensity, 25C ambient temperature and a spectrum that relates to sunlight that has passed through the atmosphere.
Solar modules has dropped from around $27 Watt Peak (Wp) in 1982 to around $2.49 Wp today and can be expected to dive much further in the future. At $1 Wp, grid parity will have been achieved and Photovoltaics (PV) will be able to compete with the prevailing price of electricity.
Two types of solar panels are manufactured, expensive crystalline silicon types and proprietary thin-film solar panels. Thin Firm CdTe (Cadmium Telluride) is a direct band gap semiconductor, which enables it to convert solar energy into electricity more efficiently (i.e., more watts per kg of material) than the indirect band gap semiconductor materials used historically.
CdTe (Cadmium Telluride) permits a low cost production process. Automated high put though production processes have been employed successfully eliminating the need for expensive clean rooms or other specialty equipment.
Thin Firm CdTe (Cadmium Telluride) semiconductor material also converts low and diffuse light to electricity more efficiently than conventional cells under cloudy weather and dawn and dusk conditions. As a result, Thin Firm CdTe (Cadmium Telluride) modules will generally produce more electricity under real world conditions than conventional solar modules with similar power ratings.
Advanced thin film design produces high energy yield across a wide range of climatic conditions with excellent low light response and temperature response coefficient. Frame less laminate is robust and can take a variety of shapes, is cost effective and recyclable as well.
A crucial metric that most look at is the measurement of kilowatt-hours per kilowatt installed. Find the wattage produced by your solar panel into watts per dollar. Most likely, when you are reach $0.15/kWh or better, you are competitive with your electric company.
The kilowatt hour is a convenient unit for electrical bills. 48- volt systems are a lot more expensive overall to setup. There are battery banks, inverters and cabling costs to consider. Still they are are a lot more efficient that 12v systems. A 1000w system would produce about 4 Kwh per day. Energy usage of a typical electrical customer in one month is several hundred kilowatt hours. Most families use between 4-9 Kwh per day. Get a solar power system guide build it yourself and utilize this energy saving technology.