1. Conversion efficiency; η=Pm (maximum cell power)/A (cell area); 2. Charging voltage; Vmax = V × 1.43 times;
3. The battery components are connected in series and parallel;
3.2 The number of battery components in series = system operating voltage (V) × coefficient 1;
4. Battery capacity (the unit is Ah, or how many W per CELL plate, called W/CELL.
Battery capacity = average daily power consumption (Ah) × design calculation formula of continuous cathode photovoltaic power generation system
5 average discharge rate
Average discharge rate (h) = number of consecutive rainy days × charge working time/maximum discharge depth
6. Load working time
Load working time (h) = ∑ Load power × Working time of the load/∑ Load power
7. Battery
7.1 Battery capacity = average power consumption of the load (Ah) × number of consecutive rainy days × discharge correction coefficient/maximum discharge depth × low temperature correction coefficient
7.2 Number of batteries in series = Voltage system operating voltage/rated battery voltage
7.3 Number of batteries connected in parallel = total battery capacity/battery rated capacity 8. Simple calculation based on operating hours 'peak sunshine
8.1 Component power = (power of electrical appliance × duration of electricity consumption/local peak sunshine hours) × loss coefficient
Loss coefficient: Take 1.6 to 2,0 depending on local pollution level, line length, installation angle, etc.
8.2 Battery capacity = (electric power × electricity consumption duration / system voltage) × number of consecutive rainy days × System safety factor
System safety factor: 1.6 to 2.0, based on battery discharge depth, winter temperature, inverter conversion efficiency, etc.
9. Calculation method based on total annual radiation
Component (square matrix) = K × (operating voltage of l 'electrical appliance × operating current of electrical appliance × operating current of electrical appliance Electricity time)/Total local annual radiation
When there is maintenance + general use, K is 230:
When no one maintains + reliable use, K takes 251:
When no one maintains + an endifficult environment + very reliable requirements, K is 276
10. Calculation based on total annual radiation and slope correction coefficient
10.1 Square matrix Power = coefficient 5618 × safety factor × total energy consumption of load/slope correction coefficient × average annual radiation amount on the horizontal plane
Coefficient 5618: According to the charging and discharging efficiency coefficient, component attenuation coefficient, etc. :
Safety factor: Depending on the usage environment, whether there is a backup power supply, whether there is someone on duty, etc. ., take 1.1 to 1.3
10.2 Battery capacity = 10 × total power consumption of the load / system operating voltage:
10: No sunshine coefficient (applicable to continuous rainy days not exceeding 5 days)
11. CMulti-channel load calculation based on peak sunshine hours
11.1 Current
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Component current = Consumption Daily Electrical Load (Wh)/System DC Voltage (V) × Maximum Sunshine Hours (h) × System Efficiency Coefficient
Efficiency Coefficient system: including battery charging efficiency 0.9, inverter conversion efficiency 0.