1: Temperature characteristics of solar power generation
When the temperature rises by 1 ℃, the maximum output power of crystalline silicon solar cells decreases by 0.04% ℃, the open circuit voltage decreases by 0.04% (- 2mv/℃), and the short circuit current increases by 0.04%.
To avoid the impact of temperature on power generation, good ventilation conditions should be maintained for the components.
2: Dust loss
The dust loss of the power plant may reach 6%! Therefore, components require frequent wiping.
3: Maximum Output Power Tracking (MPPT)
From the perspective of solar cell application, the so-called application refers to tracking the maximum output power point of solar cells. The MPPT function of the grid connected system is completed in the inverter. Recently, someone has studied placing it in a DC combiner box.
4: Line loss
The line loss of the DC and AC circuits of the system should be controlled within 5%. For this reason, conductors with good conductivity should be used in the design, and the conductors should have sufficient diameter. Cutting corners during construction is not allowed.
During system maintenance, special attention should be paid to whether the connectors and wiring terminals are secure.
5: Controller, inverter efficiency
The voltage drop of the charging and discharging circuit of the controller shall not exceed 5% of the system voltage. The efficiency of grid connected inverters is currently greater than 95%, but this is conditional.
6: Battery efficiency
Independent photovoltaic systems require the use of batteries, and the charging and discharging efficiency of the batteries directly affects the efficiency of the system, which also affects the power generation of the independent system. However, this has not yet been taken seriously.
The efficiency of lead-acid batteries is 80%; Lithium phosphate battery with an efficiency of over 90%