Solar garden lamp manufacturers
When the solar cell components of voltage rise, for example by increasing the load resistance or components of voltage from zero, Under the condition of short circuit) Began to increase, the component of the output power is also increased from 0; When voltage reaches a certain value, the power can reach the maximum, the
when the solar cell components of voltage rise, for example by increasing the load resistance or component of the voltage from zero, Under the condition of short circuit) Began to increase, the component of the output power is also increased from 0; When voltage reaches a certain value, the power can reach the maximum, then when the resistance continues to increase, power will be leaped over the biggest point, and gradually reduce to zero, the voltage at the open circuit voltage Voc. Solar battery internal resistance presents strong nonlinear. In the component's power output achieve maximum points, known as the maximum power point; This point of the voltage, known as the maximum power point voltage (Vm Also known as the maximum working voltage) ； This point of the current, known as the maximum power point current Im ( Also known as the maximum working current) ； The point of power, known as the maximum power Pm.
随着太阳能电池温度的增加，开路电压减少，大约每升高1C每片电池的电压减少5mV，相当于在最大功率点的典型温度系数为-0. 4% / C。 也就是说，如果太阳能电池温度每升高1C，则最大功率减少0. 4%. So, the sun of summer, although the solar radiation is larger, if ventilation is not good, cause the sun battery temperature rise too high, or may not be a large power output.
because the output power of solar battery components depends on the solar irradiance, the distribution of the solar spectrum, and the temperature of the solar cell, so solar energy battery components of measuring under standard conditions, STC） , measurement conditions defined by the European commission, 101 standards, the condition is:
spectral irradiance 1000 w/m2
the atmospheric quality coefficient of AM1. 5
the sun battery temperature 25 ℃
in this condition, the solar modules maximum power output is called the peak power, expressed as Wp ( 峰瓦) 。 In many cases, the components of the peak power is usually the sun simulator is used to test and and the standardization of international certification bodies of the solar cell.
by outdoor measuring the peak power of the solar energy battery components is difficult, because the solar energy battery components of sunlight received by the actual spectrum depends on the atmospheric conditions and the position of the sun; In addition, in the process of measurement, the temperature of the solar cell is also changing. In outdoor measurement error easily reach 10% or more.
if the solar cell components by other objects, Such as bird droppings, tree, etc. ) Long sheltered, obscured solar energy battery components at this time will be a serious fever, this is & other; Hot spot effect & throughout; 。 The effect of the solar cell can cause serious damage. A light battery part or all of the energy, energy generated by the battery is consumed can be covered. In order to prevent solar cells have been destroyed by the class due to thermal effect, need positive and negative electrode in solar modules in parallel a bypass diode, to avoid the light components produced by the energy consumed by cover components.
the connection box is a very important element: it protects the battery interface and the components of the internal connection with the outside world of wires and other system components. It contains a junction box and only 1 or 2 only bypass diode.