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40-41 Calculation of Battery Capacity for Solar Power Generation System

Author: Source: Datetime: 2016-12-22 15:02:40
Such as the received solar energy through the optoelectronic devices into electrical energy supply load, and in the process, there are all kinds of output power and power attenuation factor, the main factors shown in Figure 3-2. They are defined as design parameters, and the parameters of each design in the product form

That can be established as shown in Figure 3-2 model. Thereby estimating the energy supplied to the load, and performing the capacity design calculation of the system device.

Basic formula

In order to determine the capacity of a system component such as a solar battery module and the like, the following calculation formula can be used in designing a solar photovoltaic power generation system.

On the negative extension of the lip force, but to use the plan of the formula,

Calculation of battery capacity

Load a certain situation

If the power flow shown in Fig. 3-2 is formulated in the case where the load of the supplied electric power and the amount of electric power and the type of load to be used are determined, Equation (3-1) is given. Expand this formula to obtain the requirements to meet the load capacity of the battery capacity of PAS formula (3-3)
power flow formula

HA                 The amount of solar radiation from a solar panel during the period kWh / m2,

A                    Solar panel area m2

ηPS                  Standard conversion efficiency of solar panels
K                    Integrated Design Factor (Integrated System Efficiency)
EL                   The amount of electric power required for a certain period of time,kWh
D                    Solar power to ensure the rate of power supply load
R                    Design Surplus System (Safety Factor)
PAS                 Output (capacity) of solar panels under the standard
GS                   Standard solar irradiance kW / m2

D = EP / (EP + EU)                          (3-4)
EU = EUF-EUT                             (3-5)

EP                           The amount of electricity produced by a solar PV system during a period of  kWh
EU                           power (auxiliary) kWh
EUF                         Electric energy from the system  kWh
EUT                         Electricity delivered to the system kWh

R = RSRL                        (3-6)


RS                        design security system (to make up all the system design is not the real place)
RL                        design surplus factor (including the need for energy surplus)

Battery board surface certain occasions

In the case where the conversion rate of the module is temporarily set aside in the case where the land area needs to be set sufficiently as in the case of a photovoltaic power generation system for residential use, the power generation capacity of the photovoltaic power generation system to the load or the system

EP = PAS (HA / GS) K                         (3-7)
PAS = ηPSAGS                              (3-8)

Where EP is the amount of electricity generated by the solar photovoltaic power generation system, kWh

In the calculation of PV system parameters, in addition to the parameters described here, there are several parameters. Their representations are exactly the same as in (3-7).

EP = PASYP = PAS X 8760FC                                (3-9)
YP = (HA / GS) K = Y1K = 8760FC                        (3-10)
FC = YP / 8760, Y1 = HA / GS                               (3-11)


YP                  Equivalent system operating time h
FC                   during which a system utilization
Y1                    Equivalent sunshine time h

These parameters, in assessing the actual operation of solar photovoltaic power generation system is also very practical, usually K is called the system output coefficient.
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