Weak current College】 【solar batteries.

1. solar cell

Solar cell parameters are: no load voltage and short-circuit currents, both product for solar power, that is, P = UI, p is the power units is Watts (W), U-voltage units are in volts (V), it is for the current unit I (A). There are also operating voltage and current, voltage normally no load voltage of 80%-90%, the operating current is generally short-circuit current of 80%-90%.

2. battery (or batteries)

Battery for best charging current and discharge current, General press 10 hours charging or discharging rate calculation. For example: 10AH battery of the charging current best-1A, best discharge current is 1A. The battery is 7AH 700mA. The battery is 40AH 4A. Charging or discharging current metropolis on the life of the battery have a certain influence.

3. solar how to match to the battery

For example: one day to the battery is full of 12V10AH, you can choose the voltage, current 15V-18V 1A of solar panels. If you require two days that the battery is full, the use of solar panels 15V500mA. A day in the sun rays 10 hours.

For example: one day to the battery is full, 12V40AH optional voltage 15V-18V, current 4A of solar panels, or select the current of the battery plate 1A with four parallel use. If you require two days to the battery is full, the solar panels selected 2A of current. Charger, solar battery voltage higher than the battery voltage 20%-30%.

4. solar cell and battery load matching and how

Such as: the battery is fully charged 12V10AH, available for energy-saving lamp 12V10W work 8 hours. 10W CFL work current I = P/U, 10/12 = 0.8A. Battery press 10-hour discharge rate, normal discharge current for 1A, considering that the efficiency problems, so the lamp works 8-10 hours. If the bulb 40W, current 40/12 = 3.3A, it can only work 2-3 hours.

Or such calculation, 10W of solar panel to recharge the battery for the lamp 10W to electricity, the ideal State, charge 10 hours to 10 hours of electricity, and in fact is not reach in only 7-8 hours. If you use 40W lamp lighting, it's only 2 hours.