Solar Garden Light

Solar Garden Light
Make a lighting path in the garden using this simple Solar LED light. It automatically turns on in the evening and gives light in the garden. LED light turns off in the morning. You can select any colour LED like Green, White or Yellow as per the choice.
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Automatic Solar Outdoor Light

Automatic Solar Outdoor Light

Very simple to construct an Automatic Garden light using Solar Panel and LED light. ON in the evening and OFF in the morning. No switching needed and it light the premises of home even if inmates are not there. No circuit complication is here instead  only a Relay and few components are used to make this efficient Solar light. It is very well lighting my home.

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Solar Voltage Monitor. Start Up Project 32

1AHow can we confirm the voltage level from the Solar panel ? A 12 Volt Solar panel generates around 20 V DC Open circuit voltage in bright sunlight. The voltage gradually increases from 6 am and peaks in the mid noon between 11 am and 3 pm. Then the voltage from the Solar panel drops to zero around 6 p.m. So we get sufficient voltage for charging the battery for 4-5 hours only in a day. The 12 V battery requires more than 14 V for proper charging. Its current should be above 500 mA. The current rating of the Solar panel is represented in terms of Watts. As a general rule, for each watt, the current will be 80 mA. So a 10 watt Solar panel gives 800 mA current. This depends on the availability of sufficient voltage from the Solar panel. Many factors like corrosion of contacts, loose contacts in connections, dust on the panel etc will affect the current flow from the panel. So how can we monitor the voltage level from the Solar panel. A volt meter can do but we can make a simple LED Meter for this. Its cost is less than Rs.80. It has three LEDs. The Green LED lights, if the voltage from the Solar panel is above 13 V. Yellow LED lights if the voltage is between 9V and 11 V and Red LED lights, if the voltage is below 9V. Remember, the Solar panel is efficient only when the Green LED lights between 11 am and 3 pm.
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Portable Solar Generator. Start Up Project 16

7AWhat will do if you are in a place where AC is not available to power your gadgets ? You can carry this Portable Solar Generator to a Picnic spot where AC is not available. It lights a CFL to provide sufficient light and AC for charging Mobile Phone, Tablet etc and can even play a small CD player. Alternately you can use the unit in home during Power Outage days. It converts the 12 V DC from the battery to 220V AC to light the CFL. It has a bulb holder to fix the CFL and an AC outlet to tap AC for other purposes. It uses a simple 20 Watts CFL Driver board to converts DC to AC. The battery can be charged using a 12 V Solar panel or 12V DC Adapter. The battery used in this unit is 12V 3 Ah (3 Ampere Hour) rechargeable Lead acid battery which can power the CFL many hours.
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Solar Day Light. Start Up Project 15

1Why use lights during day time to waste electricity? Sometimes we need it in some rooms. We can go for a “Green Solution” to harvest Solar energy for lighting an LED light during day time. Just fix a small Solar panel and a Strip LED. It needs no battery  because the solar panel itself acts as a battery. It generates DC voltage when the Photons of the Sunlight energize its semiconductor. So the light remains on throughout day time. You need only a 12V Solar panel and a Strip LED. Connect and relax. It will do its work for 20 years. No circuit is in it and you can easily connect it.
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