What is the highest efficiency/best Light output 12v Bulb for a 12v Solar system and where can I buy them?
Hi I am looking to add a solar panel and deep cycle battery to my barn for lighting the barn and I am wondering where I can get the best performing 12v bulbs that have the approx Output of a 60W filament bulb. I will have Approx 6 bulbs up to 3 of them will run at once for 1-3 hours at a time I am assuming i will be running approx 50-100watts for lets say a couple hours a day so i am wondering how big my battery and solar panel should be as well. I hear LED bulbs are really efficient but they seem to cost a fortune to get any usable light out of them. thanks
You could use four ultra brite 5-mm LED in series with a protective 12.7 volt Zener diode across a 12 volt battery. Use an SMPS charger to maintain the battery at 13.33 volts. Use a 1 ampere diode IN4001 series to drop the voltage by 0.7 volts to 12.62 volts and feed the 4-LED series. Use as many such series to get the desired light output. The power of each 4-LED series is 12 x 15 = 180 milliwatts. If you use ten such series, (with 40 LEDs), you could have the output of a 60 Watt bulb, but use only 1.8 Watts. The system if followed to the second decimal value will last 3 years without any maintenance. It is worth the cost. You could give the specifications to any SMPS manufacturer and get it made to suit your needs.
Green Building CFL Bulb-vs-LED Light
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