Monday, March 18, 2013

Questions for Solar Panel Use

Using AMPs to Estimate Power Requirements

You should use the current draw in amps to be more accurate. Let's calculate the amp-hours the solar kit will need to generate. Using the same example of the 15 watt light bulb we note that it consumes 1.25 amps so after six hours it will have drained 7.5 Amps from the battery that needs to be replaced every day. If you want a solar panel large enough to top up the battery in 5 hours of sun then it must generate 1.5 amps. Reading the electrical data for a 20w solar panel shows the Maximum amps (Imp) is 1.2amps...Not enough, so our previous calculation using watts gave incorrect data, why? Because the solar panel generates about 18 volts but we are only using about 14 volts to recharge the battery, the rest of the solar power is wasted. Using amps we see that we will need a larger solar panel, in this case a 30 watt BP solar panel with an Imp of 1.8 amps.

20w solar panel

What recommendations give when looking for a solar powered battery charger to charge a 12v battery for solar power house supply? It is recommend one of the folding solar panels. They are available in sizes 10, 20, 40, 80 and 120 watts. They have attached solar regulators (except the 10 and 20 watt Powertech kits) and come with battery cables with clamps. The size you select would depend on your battery size and power usage. The 20 watt unit generates out about 1 amp at 14 volts (battery charging voltage) and the large 120 watt unit puts out about 6 amps. You can estimate a solar panel collects about 5 hours of peak sunlight per day, so the 20 watt unit would provide about 1amp x 5 hours = 5 Amp-hours a day, the 120 watt unit would provide about 5 x 6 = 30 Amp-hours a day, (enough to fully charge a 30 amp-hour battery ). Replace that calculation with you actual data to work out how large the solar panel needs to be. Solar panels are rated in watts. For instance, 500 watt solar panels will produce 500 watts of power each hour of peak sunlight. A Solar module manufacturer will produce different solar panels according to customers’ needs in watts.

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