1. Conversion efficiency
η= Pm (peak power of solar cells)/A (solar cell area) × Pin (incident light power per unit area)
Among them: Pin=1KW/㎡=100mW/cm ².
2. Charging voltage
Vmax=Vrated × 1.43
3. Series parallel connection of solar modules
3.1 Number of solar modules in parallel=Average daily load electricity consumption (Ah)/Average daily power generation of modules (Ah)
3.2 Number of solar modules in series=System operating voltage (V) × Coefficient 1.43/peak operating voltage of the component (V)
4. Battery capacity
Battery capacity=average daily electricity consumption under load (Ah) × Continuous rainy days/maximum discharge depth
5. Average discharge rate
Average discharge rate (h)=consecutive cloudy and rainy days × Load working time/maximum discharge depth
6. Load working time
Load working time (h)=∑ Load power × Load working time/∑ load power
7. Battery
7.1 Battery capacity=average load electricity consumption (Ah) × Continuous rainy days × Discharge correction factor/maximum discharge depth × Low temperature correction coefficient
7.2 Number of series connected batteries=system operating voltage/nominal battery voltage
7.3 Number of parallel batteries=total battery capacity/nominal battery capacity
8. Simple calculation based on peak sunshine hours
8.1 Component power=(Consumer power) × Electricity consumption time/local peak sunshine hours) × Loss coefficient
Loss coefficient: take 1.6-2.0 based on local pollution level, line length, installation angle, etc
8.2 Battery capacity=(consumer power) × Power consumption time/system voltage) × Continuous rainy days × System safety factor
System safety factor: take 1.6 to 2.0, based on battery discharge depth, winter temperature, inverter conversion efficiency, etc
9. Calculation method based on annual total radiation
Component (matrix)=K × (Operating voltage of electrical appliances) × Working current of electrical appliances × Electricity consumption time/local annual radiation total
When maintained by someone and in general use, K is set to 230. When maintained by no one and used reliably, K is set to 251. When maintained by no one and in harsh environments, K is set to 276
10. Calculation based on annual total radiation and slope correction coefficient
10.1 Matrix power=coefficient 5618 × safety factor × Total load electricity consumption/slope correction factor × Annual average horizontal radiation
Coefficient 5618: Based on charging and discharging efficiency coefficient, component attenuation coefficient, etc.: Safety coefficient: Based on usage environment, availability of backup power supply, presence of personnel, etc., take 1.1 to 1.3
10.2 Battery capacity=10 × Total power consumption of load/system operating voltage: 10: No sunshine factor (applicable to continuous rainy and cloudy weather for no more than 5 days)
