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PAT255- Renewable Energy – Stand Alone Photovoltaic (SAPV)

Learn how to utilize a stand-alone photovoltaic system for autonomous electricity supply in a summerhouse or weekend home, including estimating energy consumption, sizing the PV system, and dimensioning storage capacity.

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PAT255- Renewable Energy – Stand Alone Photovoltaic (SAPV)

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  1. PAT255- Renewable Energy – Stand Alone Photovoltaic (SAPV)

  2. HOW TO USE? Preliminaries:  Generally one should utilize only power-saving devices to be fed by a stand-alone PV system. Additionally, by utilizing devices operating at 12 or 24 V DC (since PV systems provide originally DC voltage) some conversion losses can be avoided. Stand-alone photovoltaic system for autonomous electricity supply of a summerhouse or weekend home including a 220Wp PV generator and maintenance free accumulators (100Ah/24V) as well as a 50A charge regulator. The built in inverter supplies 1.200 W continuous power and 3.300W temporary peak power.

  3. 1. Estimating the daily energy consumption

  4. For every device multiply the power input (measured in Watt) with the hours of power-on time. Sum up the results and add some buffer (depending on the uncertainty of your forecast).Since the consumption will differ with the season, you should calculate this independently for summer and winter season (at least).

  5. 2. Determine the size (energy output) of the PV system

  6. The averaged daily energy yield by the PV system should be sufficient to cover the daily consumption (calculated per season, since between summer and winter the »harvest« differs widely). • To forecast the daily energy yield we need data about the daily irradiance at the location of the PV modules. Such data is available from different sources at the web (e.g. http://www.nrel.gov/ for the USA or http://re.jrc.ec.europa.eu/pvgis/ for Europe and Africa). To get the energy yield provided by the PV system the radiation (measured in kWh/m2/day) has to be multiplied with the module capacity (nominal output, given in Kilowatt Peak, kWp) and the result corrected by factors including the deviation of the optimal orientation and inclination of the modules. • .

  7. 3. Dimensioning the storage capacity

  8. Since the PV system generates electricity when the sun is shining, which is in many cases not the time we need the energy, we use rechargeable batteries to store electrical energy. The capacity of such batteries is measured in ampere-hours (Ah). If we divide the assumed consumption per day (in Wh) by the output voltage (in V DC) of the storage system (mostly 12 V DC or 24 V DC, depending on the interconnection of the batteries), we get the capacity we need to bridge one day, e.g. with a daily consumption rate of 0.5 kWh: 500Wh/12V = 41.7 Ah.To avoid damages by deep discharge, we should double this value to 84 Ah per day. If the facility is used only in summer, we calculate 2.5 days at max to bridge, resulting in a total capacity of about 210 Ah; in winter we have to calculate with up to 5 days to bridge, so the total capacity would be 420 Ah.

  9. HOW DO SOLAR PANEL WORKS?

  10. Video

  11. HOW WE TURN SOLAR ENERGY INTO ELECTRICITY?

  12. Video

  13. Q & A THANKS

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