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1381-based Solar Engine - Voltage-Controlled Solar Engine: Two simple solar
engine designs using a 1381* voltage discriminator. (added 11/05) |
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14 Volt Toilet Tank Refiller - (Circuit design added 8/03) |
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555-based solar engine - Time-Controlled Solar Engine: a solar engine design
using a 555 timer IC (added 11/05) |
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5v Solar Charger - This project uses the 1.2v rechargeable battery and solar
panel from a Solar Garden Light. These lights can be bought for less than $5.00 in
most $2.00 shops or similar shops that sell general household items diagram….(circuit
added 05/07) |
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24v NiMH Battery Charger Using a
12v Solar Panel A
while back I got an email from a guy in the UK. He wanted to use a small solar
panel, designed to charge 12v lead acid batteries, but use it to charge a 24v battery
pack. His 24v battery pack used 20 AA size NiMH cells. He went on to
explain that his 20 cell NiMH battery pack was used very infrequently. He used
the pack to open and close window blinds powered by a brush motor and controlled by a
rocker type toggle switch. He said that the motor would draw about 2 amps from
the 24v pack for 20 seconds for each operation. He also said that typically the
blinds were operated only 4 times each day; two times to open and two to close.
He wanted to know how to charge the higher voltage battery using the lower voltage
solar panel.....[Circuit
of the Week designed by David Johnson] |
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A simple solar panel regulator - Solar panel regulators come in many
flavors. The plainest flavor is the simple on-off type shunt regulator. It has the
advantage of simplicity, extremely small power dissipation, low cost, high
reliability, but in exchange for these advantages one has to accept that the voltage
on the battery is always going slightly up and down, that the battery is switched
between full charging current.... [Tony van Roon's circuit] |
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A Solar Cell Battery Charger - A Simple Regulator for Charging Lead Acid
Batteries from a Solar Cell....(electronic schematic added 12/08) |
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AA Battery Solar Charger (Solorb) - This almost trivial circuit may be used
to charge a pair of AA or AAA sized cells in sun….(added 5/02) |
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AC Servo Motor Windmill - A windmill built around a 3 phase servo motor from
an old welding robot. |
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Analog Shunt-mode Solar Charge Controller - This circuit is an analog
alternative to the switching Shunt-mode Solar/Wind Charge Controller. It is one of the
simplest ways to regulate the solar charging of a rechargeable battery, using about a
dozen parts. Despite its simplicity, the circuit is relatively efficient. Unlike the
all-or-nothing switching shunt-mode controller, this circuit gradually diverts solar
power from the battery to the dump load resistor as the battery reaches the preset
battery float voltage.... [G. Forrest Cook] |
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Another solar panel regulator - This is a switching shunt regulator which is
very simple and reliable, but does not regulate as smoothly as the one above and has
no deep-discharge protection. It was built for a yacht. [Manfred Mornhinweg] |
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Battery Low Voltage Beeper - This circuit provides an audible and visual low
voltage warning for 12V battery powered devices. Idle current: 6ma Low Voltage Warning
current: 15ma…. [Circuit designed by Forrest Cook] |
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Broken Solar Panels - As illustrated below, one way to salvage a large
number of broken solar cells is to wire them in parallel, not in the more conventional
series connection. Broken cells of various sizes and shapes are grouped together into
panels of about one quarter to one full square foot in area. Those panels are then
wired in series with other similar panels. The result …. [Hobby Corner Circuit by Dave
Johnson] |
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Buck Mode Switching Regulator for Solar Applications - The purpose of a
voltage regulator circuit is to take a variable input voltage and produce a steady
output voltage. Two common regulator types are linear and switch-mode. Linear
regulators are simple, but waste a lot of power in the process of regulating the
voltage. Linear regulators can be thought of as self adjusting series resistors.
Switch-mode regulators such as this one are much more efficient. Switch-mode
regulators convert DC input voltages to pulses of high voltage DC. The DC pulses are
used to charge a storage capacitor to the desired output voltage. The voltage is
regulated by varying the width of the DC pulse.... [G. Forrest Cook] |
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Build Your Own Solar Battery Charger - (circuit added 6/07) |
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