Solar Charger

In: Science

Submitted By sindhura
Words 4397
Pages 18
SOLAR CHARGER
A great kit for self-sufficiency
It'

SOLAR CHARGERS: 1. SOLAR CHARGER - this page - using a ZTX 851 transistor
2. Solar Light
3. Power Supply 5v Solar - Circuit 1
4. Power Supply 5v Solar - Circuit 2
5. Solar Charger - Push Pull circuit

Some products are not yet available for 12v operation but inverters are available from 100watts to 4kw. The aim of this project is to cater for the other end of the range. We are looking at charging a 12v battery, using the cheapest set of solar cells and the cheapest inverter. This also means the cheapest 12v battery - a 1amphr (1AHr) gell cell or 6v cells salvaged from old analogue mobiles! THE PROBLEM
The problem with charging a battery from a solar panel is the SUN! It doesn't shine all the time and clouds get in the way! Our eyes adjust to the variations in the strength of the sun but a solar panel behaves differently.
As soon as the sun loses its intensity, the output from a solar panel drops enormously. No only does the output current fall, but the output voltage also decreases.
Many of the solar panels drop to below the 13.6v needed to charge a 12v battery and as soon as this occurs, the charging current drops to ZERO. This means they become useless as soon as the brightness of the sun goes away.
Our project cannot work miracles but it will convert voltages as low as 3.5v into 13.6v and keep delivering a current to the battery. Obviously the current will be much lower than the maximum, when the sun "half-shines" but the inverter will take advantage of all those hours of half-sun.
At least you know it will be doing its best ALL THE TIME.
The other advantage of the inverter is the cost of the panel. You don't have to buy a 12v panel. Almost any panel or set of solar cells will be suitable. You can even use a faulty 12v panel. Sometimes a 12v panel becomes damaged or cracked due to sun,…...

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