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Solar Cell Circuits   Page 1
Solar Cells:   # - B       C-H      I - M       N - R       S       T - Z
Last Updated on: Friday, October 17, 2014 06:58 AM

Circuits Designed by Dave Johnson, P.E. :
  • 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.....
  • 8 Solar Cell Lithium Ion Battery Charger
    A single lithium ion battery cell needs 4.2v from a current source to insure it is fully charged.  A solar panel with just enough individual cells wired in series to produce the needed voltage would be more efficient than one with more cells for a given surface area.  If you divide 4.2 by eight you come up with a figure of 0.525 volts....
  • 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...


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
10 Amp Solar Charge Controller -  (electronic circuit (added 11/06)
12 Volt 20 Amp Solar Charge Controller -  The SCC3 kit is the heart of a 12 Volt solar power system, it regulates the charging of batteries from photovoltaic (PV) solar panels. A charge control regulator is an essential part of any solar power system. 
12 Volt Differential Temperature Controller -  for hot water and hot air system control [G. Forrest Cook]
12V, 4-AA Cell Differential Temperature Charger -  This project makes a number of improvements over my Temperature Controlled NICD Charger circuit. The new circuit runs on 12VDC, allowing it to be used in a car or from a 12V solar power system. Additionally,.... [G. Forrest Cook]
13 Volt 6 Amp Solar Power Center -  (Circuit added 11/06)
1381 Solar Engine -  Well the most common use is in a solaroller  which is a small wheeled car that charges up and then moves in a quick burst of speed. Since you can only use motors and coils with this circuit robots built...[Mark W. Tilden mwtilden@lanl.gov]

1381-based Solar Engine -  Voltage-Controlled Solar Engine: Two simple solar engine designs using a 1381* voltage discriminator.  (added 11/05)
14 Volt Toilet Tank Refiller -  (Circuit design added 8/03)
555-based solar engine -  Time-Controlled Solar Engine: a solar engine design using a 555 timer IC  (added 11/05)
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)
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]
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]
A Solar Cell Battery Charger -  A Simple Regulator for Charging Lead Acid Batteries from a Solar Cell....(electronic schematic added 12/08)
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)
AC Servo Motor Windmill -  A windmill built around a 3 phase servo motor from an old welding robot.
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]
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]
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]
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]
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]
Build Your Own Solar Battery Charger -  (circuit added 6/07)

Solar Cells:   # - B       C-H      I - M       N - R       S       T - Z


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