Solar Power Calculation

UTLB

MECA 5A IEE

SOLAR POWER CALCULATION

To obtain the photovoltaic power the following calculation is applied:

SOLAR POWER CALCULATION Photovoltaic energy resulting in AC = Installed photovoltaic power (CC panels, STC) x Solar radiation (value of the database, kW / m² day) x percent loss factor (*)

SOLAR POWER CALCULATION Application example of the online photovoltaic calculator

SOLAR POWER CALCULATION The example is given for an installation located in Queretaro,, Qro, Mexico.

SOLAR POWER CALCULATION

To obtain the photovoltaic power the following calculation is applied: Photovoltaic energy resulting in AC = Installed photovoltaic power (CC panels, STC) x Solar radiation (value of the database, kW / m² day) x percent loss factor (*)

SOLAR POWER CALCULATION Installation conditions Type of Photovoltaic Generator: Crystal Silicon. Isolated installation of any building, good natural ventilation. Inclination equal to latitude, 42º. Fixed azimuth, ie photovoltaic panel facing South without East-West deviation.

SOLAR POWER CALCULATION Type of losses

SOLAR POWER CALCULATION 1.-Estimated losses due to temperature and radiation: 9% Photovoltaic efficiency is affected by the temperature of the module, in general efficiency decreases with increasing temperature.

SOLAR POWER CALCULATION 2.-Estimated losses because not all solar radiation reaches the sensitive material of the panel and produces electricity: 2.5%

SOLAR POWER CALCULATION 3.-Losses inside the electronic stage of conversion to alternating current, as are the losses caused by diodes, regulators and inverters. Plus the losses in the wiring necessary to reach the precise place where you will consume the electricity: 12%

SOLAR POWER CALCULATION 4.-Other losses: 1.5% Total loss adopted: 25% Loss factor = 1 - 0.25 = 0.75

SOLAR POWER CALCULATION Applied to the previous calculation (*) Photovoltaic energy resulting in AC per day = Photovoltaic power installed in CC x Solar Radiation per day x 0.75 For a 1kW (STC) installation consisting of 5 flat 200 watt photovoltaic panels: It is 5 x 200 Watt = 1000 W = 1kW Solar radiation accumulated during one day of 2.9 kW / m² per day

SOLAR POWER CALCULATION Queretaro, Ecologia 274, Tecnologico (Home): 17° N Deorientation South: 0° Type of energy: 110 V AC Consumption per day White line: 2410 Wh/day Lightning: 1010 Wh/day Total: 3420 Wh/day

SOLAR POWER CALCULATION SYSTEM TENSION: 24 V DAILY THEORICAL ENERGY: 3420 WH/DAY PERFORMANCE RATIO: 82.88% DAILY REAL ENERGY: 4126.45 WH/DAY

SOLAR POWER CALCULATION PHOTOVOLTAIC FIELD ANNUAL OPTIMAL SLOPING PER CONSUMING: 21.31° PHOTOVOLTAIC POWER NEEDED: 993 Wp

SOLAR POWER CALCULATION MODULE PV CHARACTERISTICS: POLICRYSTALINE Pmax: 230 Wp

Vmp: 29.8 V

Voc 37 V

PHOTOVOLTAIC POWER CALCULATED: 920 Wp NUMBER OF MODULES: 4 IN PARALELE CHARGE REGULATOR: OPEN SYSTEM TOTAL INTENSITY: 41.00 A CLOSED SYSTEM TOTAL INTENSITY: 38.91 A REGULATOR: 1 unit A max: 45 A Voc: 48 V A. total 45 A

Eficiency: 89.6%

SOLAR POWER CALCULATION BATTERIES: 12 UNITS AUTONOMY: 3 DAYS DISCHARGE: 60% USEFUL CAPACITY: 516 Ah REAL CAPACITY: 860 Ah TENSION PER UNIT: 2 V UNITS IN SERIES: 12

SOLAR POWER CALCULATION INVERSOR CHARGER W cal 1922 w Max Charge 54 Ah

W Min 1538 w Min Charge 27 Ah

Security factor: 80% W nominal 3000 W W Continuous 2500 W Charge Capacity 70 Efficiency 94 Units: 1

SOLAR POWER CALCULATION Now, calculate the energy needed for your home

SOLAR POWER CALCULATION

www.lawebdelasenergiasrenovables.com Promedio por meses (datos tomados por sátelites durante 22 años Julio 1983 - Junio 2005).

Radiación Solar Resultados: Coordenadas [ 21 / -100 ] cerca de Querétaro - Queretaro de Arteaga - Mexico

Insolation Incident On A Horizontal Surface (kWh/m^2/day) Ene

Feb

Mar

Abr

May

Jun

Jul

Ago

Sep

4.04

4.92

5.86

6.28

6.44

6.03

5.64

5.76

4.71

Minimum Insolation Incident On A Horizontal Surface (kWh/m^2/day) Ene

Feb

Mar

Abr

May

Jun

Jul

Ago

Sep

2.76

4.24

5.02

5.48

5.86

5.17

4.54

4.94

3.13

SOLAR POWER CALCULATION

SOLAR POWER CALCULATION

SOLAR POWER CALCULATION

SOLAR POWER CALCULATION