how much watt of solar panel do i need for a 10watt LED bulb?
i'm dealing with a street lamp design which is powered by solar energy.
and after some researches, i decided to use a 10 watt LED bulb for the street lamp. and i want to know that how much watt of solar panel do i need to supply electricity to the bulb.
besides, how much volt of battery is needed? the street lamp must be able to store energy during day time so that the street lamp works during night time. and in case of raining, do i need more battery to store energy?
btw, what else do i need for the street lamp? controller?
You must first determine for how long do you need the light to be on.
Second the wattage of the solar panel will determine how many electrical units will be generated in each day, i.e more the wattage more the units generated. Plus you must take into account the efficiency of the solar panels & the charge controller so the cumulative multiplied effect will give a different result.
Normally the led's can work on AC as well as DC Supply, so i feel you wont be needing an inverter.
Take a look at the LED Bulb's voltage & current ratings.
Once you know the current then get the time of keeping the LED Light on
multiply it & you will get your Ampere Hour rating of your battery. You may add some 10% to 20% to it to account for the losses in the wires and giving it more autonomy during the days when there is low or no sunshine.
Additional accessories i suggest,
photocell : this automatically will power up your led lamp once the sunlight incident on it reduces below a particular threshold.
Also have reflectors installed before you install your LED lamp, this will ensure good light quality
www.solarenergyexplorer.com/solar-electricity.html
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