![]() ![]() Total appliances use = (18 W x 4 hours) + (60 W x 2 hours) + (75 W x 12 hours)īattery capacity = x 3 The inverter size should be about 190 W or greater. Total Watt of all appliances = 18 + 60 + 75 = 153 Wįor safety, the inverter should be considered 25-30% bigger size. So this system should be powered by at least 4 modules of 110 Wp PV module. Size the PV panel 2.1 Total Wp of PV panel capacity Determine power consumption demands Total appliance use = (18 W x 4 hours) + (60 W x 2 hours) + (75 W x 24 x 0.5 hours)Ģ. The system will be powered by 12 Vdc, 110 Wp PV module.ġ. One 75 Watt refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours.One 60 Watt fan used for 2 hours per day.One 18 Watt fluorescent lamp with electronic ballast used 4 hours per day.(See Basics of MPPT Charge Controller)Įxample: A house has the following electrical appliance usage: Remark: For MPPT charge controller sizing will be different. Solar charge controller rating = Total short circuit current of PV array x 1.3 (0.85 x 0.6 x nominal battery voltage) 5. Need the system to operate when there is no power produced by PV panels) to get the requiredĪmpere-hour capacity of deep-cycle battery.īattery Capacity (Ah) = Total Watt-hours per day used by appliances x Days of autonomy To find out the size of battery, calculate as follows:Ĥ.1 Calculate total Watt-hours per day used by appliances.Ĥ.2 Divide the total Watt-hours per day used by 0.85 for battery loss.Ĥ.3 Divide the answer obtained in item 4.2 by 0.6 for depth of discharge.Ĥ.4 Divide the answer obtained in item 4.3 by the nominal battery voltage.Ĥ.5 Multiply the answer obtained in item 4.4 with days of autonomy (the number of days that you The battery should be large enough to store sufficient energy to operate the appliances at night and cloudy days. Deep cycle battery is specifically designed for to be discharged to low energy level and rapid recharged or cycle charged and discharged day after day for years. The battery type recommended for using in solar PV system is deep cycle battery. ![]() Auxiliary energy sources - is diesel generator or other renewable energy sources.Load – is electrical appliances that connected to solar PV system such as lights, radio, TV, computer,. ![]()
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