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## Solar power calculator## Solar power system componentsLet’s start with a brief revision of the major components found in a basic ## A basic solar powered system:
The ## Description of individual solar power system components## Solar Panels Different geographical locations receive different quantities of average peak sun hours per day. ## Solar Regulators The purpose of ## Power inverters The
## DC to AC power invertersJust over a decade or so ago, If you have recently tried to shop around for 12V DC appliances, you will see that there is a very limited selection available. Today, the efficiency and reliability of the latest There are three waveforms produced by modern solid state power inverters. The simplest, a square wave power inverter, used to be all that was available. Today, these are very rare, as many appliances will not operate on a square wave. ## Solar Batteries ## Choosing the right size solar regulatorA Example: An 80W 12V solar panel has a rated output current of 4.55 Amps and a rated short circuit current of 4.8 Amps. Minimum solar regulator size for a single 80W solar panel should be: 4.8 Amps x 1.20 = 5.76 Amps. It is recommended that the regulator selected is even slightly larger than this figure to ensure that it is not constantly operating at 100% of its rating, particularly in regions with higher ambient temperatures. A good rule of thumb is a margin of between 20 and 30%. ## Sizing your solar power system In order for you to size your Let us take some common household appliances like lighting, a TV, and a fridge to see how one calculates the correct size solar system: 10 x 12W globes = 120W operating 10 hours per day. = 1200W.H 2 x TV x 250W = 500W operating 6hrs per day = 3000W.H Fridge x 250W = 250W operating 24/7 = 6000W/day ## Power inverter sizingAppliance total power draw = 120W(for the 10 lights) + 500W(for the 2 TV’s) + 250W(for the fridge) = a total power draw of 870W. To provide a small buffer or margin your minimum size inverter choice should be around 1000W. A modified sine wave inverter with a 1500W continuous power rating will therefore be your obvious choice in this specific solar system design. ## Determining the size and number of solar panelsHere we take the total power usage daily = 1200W.H + 3000W.H + 6000W.H This = a total of 10200W.H Divide the total daily power requirement by the number of charge hours for that geographic region eg. 10200/5.5Hrs = 1854.54W Add 20% for inefficiencies = 2225.45 W This total power value determines the size and number of panels eg. 2225.45/75W panels = 30 x 75W panels. If you fancied say 125W panels , then 2225.45/125W = 18 panels. ## How many batteries?Well the 75W panels produce 4.4Amps, thus 30 x 4.4 A = 132A x 5.5 Hrs = 726Ah 105Ah batteries, should be discharged to no more than 50%, thus we divide total amps by 105A x 50% = 50A.H 726/50A = 14.5 x 105Ah batteries. For ease of possible 24V or 48V configuration, this would mean 16 batteries. ## What size regulator do we need ?Let’s say we had 20A regulators at our disposal. One 75W panel produces around 4.4Amps. 3 x 4.4A = 13.2A So 30 solar panels would need 30/3 = 10 x 20A solar regulators. ## Complete the solar power systemWell we have the following: - 30 x 75W
**solar panels** - 10 x 20A
**solar regulators** - 16 x 105A.H
**deep cycle batteries** - 1 x 1000W
**modified sine wave power inverter**
Thus we have calculated the |
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How solar power works | Solar power components | Solar panels | Solar power system regulators | Solar batteries | Solar inverters | Calculate you power reguirements | Solar power | Replace electricity mains completely |
4 x4 solar power applications | Power for rural dwellings | Power for game lodges | Power for holiday homes | Power for farm houses |
Global warming - food for thought | Global warming - practical suggestions
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