How does the selection of solar power kits for home use inverter ?
At present, different manufacturers have different technical routes for solar power kits for home use inverters. In general, single-phase solar power kits for home use inverters under 6kW and three-phase solar power kits for home use inverters under 10kW are mostly used in household use, two-way MPPT are used, each MPPT is equipped with one way of string; in small industrial and commercial projects, 20kw to 40kW solar power kits for home use inverters are generally used, the number of MPPT is two to four ways, each MPPT is equipped with two to four ways of string; in large power stations, 60kW to 80kW high-power string the solar system kit inverters are generally selected, the number of MPPT is one to six ways, each way of MPPT is equipped with 2 to 12 way string.
Choosing different MPPT routes has a certain impact on the power generation of the the solar system kit. From the point of view of solving the problem of mismatch, the fewer the strings behind an MPPT, the better; from the point of stability and efficiency, the more the strings behind an MPPT, the better, because the more the number of MPPT, the higher the system cost, the worse the stability and the more the loss. In practical application, it is necessary to select the appropriate scheme in combination with the actual terrain.
Advantages of MPPTthe solar system kit inverter in less string formation:
1) less function loss: there are many MPPT algorithms, such as interference observation method, incremental conductance method, incremental conductance method, etc. No matter which algorithm, it is to judge the change of sunlight intensity by continuously changing the DC voltage, so there will be errors. For example, when the voltage is actually at the best working point, the solar system kit inverter will try to change the voltage to determine whether it is right or not The best working point, one more MPPT, one more loss.
2) less measurement loss: when the MPPT works, the full solar panel kit home inverter needs to measure the current and voltage. Generally speaking, the greater the current, the greater the anti-interference ability and the less the error.
3) less circuit loss: MPPT power circuit has an inductor and a switch tube, which will cause loss during operation. In general, the greater the current, the smaller the inductance and the less the loss.
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