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Solar Cell Circuits  

Solar Cells:   #'s - E       F - O      P - S       T - Z
 

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

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 on . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2012

Cell Phone Solar Powered Charger -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas instruments . . . Hobby Circuit designed by Dave Johnson P.E.-January, 2011

Charging a 24v Battery Charger from a 12v Source -  A while back I received an email from a Discover Circuits visitor.  He wanted to know how he could use a single 12v solar panel to charge a 24v lead acid battery bank.  He said he used the 24v battery to run an emergency 120vac power system.   By using the higher 24 volts instead of 12v, his DC to AC inverter could pump out more peak power, for starting things like well pumps and window air conditioners. . . . Circuit by David Johnson P.E.-July, 2017

Colman_Lantern3_Modified -  While shopping at a sporting goods store one day, I spotted a compact LED lantern.  It looked like the kind of lantern I could modify. The lantern LEDs were grouped into three sections of 7 LEDs each, oriented into 120 degree angles.  The LEDs were standard T 1-3/4 epoxy types.  The lantern had a three mode switch which selected between off, full power and half power modes.  At the half power mode, only half of the 21 LEDs were illuminated.  At full power all LEDs were illuminated. . . . Hobby Circuit by David Johnson P.E.-September, 2017

Convert Solar Powered Light to Flasher -  The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash.  This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit.  The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David A. Johnson P.E.-March, 2010

Eight-Solar Cell Lithium Ion Battery Charger Version 3 -  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. . . Circuit by David Johnson P.E.-May, 2013

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A 12/24V Intelligent Solar Power Battery Charger. -  Don't cook your batteries by connecting them directly to a solar panel.  This charger turns off the power when the battery is charged.__ SiliconChip

A 555-based solar engine - Type 2 (time-controlled) Solar Engines -  in March of 2003, Manfred Schaffran posted a solar engine design using a 555 timer IC .   Wilf Rigter simplified this circuit a bit, made it phototropic, and doubled it up to yield a photopopper design in a post later the same day.  I'vegot this design written up elsewhere in the library. __ Designed by  Manfred Schaffran & Wilf Rigter

A Simple Circuit 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 __ Designed by Tony van Roon  VA3AVR

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 and no charging current, and that disconnection of the battery will result in high voltage output pulses from the regulator. __ Designed by Manfred Mornhinweg

A Solar Cell Battery Charger -  A Simple Regulator for Charging Lead Acid Batteries from a Solar Cell.   __ Designed by G.L. Chemelec

A Solar or Wind Charger/Dump -  Solid State design, No Relays.  This is just a Preliminary design.   __ Designed by G.L. Chemelec

A Solar-Powered Intruder Alarm for Sheds & Boats -  Most blokes have got a shed - or wish they had!  While many people have alarms for their home and cars, a lot of valuable stuff is unprotected in garages and sheds.  it needs protecting and now you can do it with this simple alarm based on a PiR sensor.  it's solar-powered so no mains supply is needed.  And let's not forget boats on moorings - they need protecting too.__ SiliconChip

A Solar-Powered Lighting System -  Need lighting away from a power source? Try this one: it's ideal for your garden, shed or even a camp site.  With a 5W solar panel, a 12V SLA battery and a smart controller, it has 3-stage charging for the battery and Maximum Power Point Tracking (MPPT) for the solar panel.__ SiliconChip

A Solar-Powered Lighting System, Pt.2 -  Last month we described the operation of our new off-grid lighting system, featuring free power courtesy of the sun!  Now we move on to the fun part: building it! __ SiliconChip

AA Battery Solar Charger -  This almost trivial circuit may be used to charge a pair of AA or AAA sized cells insun __ Designed by G. Forrest Cook

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 __ Designed by 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. __ Designed by Manfred Mornhinweg

Arduino Solar Charge Controller -  8-Aug-14 -Design News:   Solar power has the advantages of being low-maintenance and pollution-free, but the main drawbacks are high fabrication costs and low energy conversion efficiency.  Since solar panels still have relatively low conversion efficiency, the overall system costs can be reduced using an efficient solar __  Gadget Freak-Case #260

Automatic Solar Garden Lights with LEDs -  Efficient automatic solar garder lights circuit with minimum components the best deal is that is completely auto and the Solar panel acts as a light detector.  Switches the Lamp off at Dawn, charges the battery during daytime and switches the LED lights ON at dusk providing 100 Lumens illumination during the night.  The solar __ Designed by Sebastian Kushero

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.   __ Designed by G. 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 on . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2012

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 __ Designed by G. Forrest Cook

Build a 12/24V 3-Stage Solar Charge Controller -  Are you building the ultrasonic anti-fouling unit for your boat? You will need a solar panel and a charge controller to keep the batteries topped up.  Or are you thinking of a large solar panel for your caravan or 4-wheel drive? Again, you will need a solar charge controller.  This is the one to build.__ SiliconChip

Build Your Own Solar Battery Charger -  For this project I used 12 cells but you really only need 6.  So if you are on a budget use 6 but if you want a fast charger use 12.  Next lay out all your cells on your window to make sure everything is going to fit.  I used the "deeper" side of the window so that there would be more room__ 

BVM1 12V LED Battery Voltage Monitor -  The BVM1 kit can be used to monitor the voltage of a 12 Volt battery.  it features ten ultra-bright LEDs in five vivid colors for quick battery voltage measurement.  One of the LEDs will briefly blink on every 1.25 seconds, keeping average power consumption low.  The display is readable from dark to full sunlight.  A switch-controlled low voltage beeper is included, this provides a warning when the battery voltage drops below a preset value and can help to prevent excessive discharge.   __ Designed by Solar Orbit Kit

Cell Phone Solar Powered Charger -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas instruments . . . Hobby Circuit designed by Dave Johnson P.E.-January, 2011

Chloroplast Voltage Controlled Solar Engine -  Voltage-Controlled Solar Engine: These designs are based on the Motorola MC34164-* micro power undervoltage sensing IC s.  They're pretty efficient, work at higher voltages than most solar engines, and can provide voltages for other logic circuits (say, a microprocessor).  This page hosts the original Chloroplast by Craig Maynard, as well as some Chloroplast variants by Wilf Rigter.   __ Designed by Craig Maynard

Circuit Implements Photovoltaic-Module Simulator -  04/07/11  EDN Design Ideas:  Use combinations of diodes to simulate photovoltaic cells.  Electronics engineers often use photovoltaic-module simulators to test dc/dc-power converters, inverters, or MPPT (maximum-power-point-tracking) -control techniques.  The use of these simulators lets you work in the laboratory with predefined photovoltaic conditions, thus avoiding the drawbacks of real photovoltaic modules.  Various commercial simulators are available, but they are often expensive.   __ Circuit Design by José M Blanes and Ausiŕs Garrigós, University Miguel Hernández, Elche, Spain

CNC Router -  Now this was an interesting project.  __ 

Convert Solar Powered Light to Flasher -  The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash.  This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit.  The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David A. Johnson P.E.-March, 2010

Converting Light to Digits: LTC1099 Half-Flash 8-Bit A/D Converter Digitizes Photodiode Array -  AN33 Linear Technology This App Note describes a "Half-Flash" A/D converter, the LTC1099, being connected to a 256 element line scan photodiode array.  This technology adapts itself to handheld (i.  e.  , low power) bar code readers, as well as high resolution automated machine inspection applications.  __ Linear Technology/Analog Devices

D1 Solar Engine -  Charges all day, runs at night.  Think noctibot here.   __ Contact Nervous nets © and patented Mark Tilden. Content originally developed Ian Bernstein

D1 solar engine solarbotICs -  Nocturnal-Controlled Solar Engine: The D1 solar engine is the original nocturnal solar engine design.  The design is simple, tuneable, but no longer terribly useful (I include it here just for purposes of education and folks' historical interest).   __ Designed by Wilf Rigter

DI Nocturnal Solar Engine -  The D1 solar engine is the original nocturnal solar engine design.  The design is simple, tuneable, but no longer terribly useful (I include it here just for purposes of education and folks' historical interest).  This design has a number of weaknesses; courtesy of Wilf Rigter, here are a few: __ Contact Eric Seale

DIY Solar Birdhouse Light -  This solar birdhouse light is an economical circuit of a minI solar lighting system circuit is presented here.  At the heart of the circuit is a minI 6V/2W solar panel.  Here, this solar panel is used to charge a 4V/800mAh rechargeable battery through a charge current limiter circuit built around an adjustable 3-pin regulator __ Designed by D Mohankumar

DIY Solar Tracker System -  The solar panels are operating at optimal parameters when they are at the perfect right angle to the sun.  Unfortunately this is accomplished only if solar panels are rotated by the sun.  This is the purpose of this diy solar tracker system.  The solar tracker circuit uses a window comparator to maintain the motor in a idle state __ Designed by Popescu Marian

Dual Axis solar tracker system -  This system requires involvement of a wide range of engineering including mechanical electrical and electronics. The mechanical part would involve designing a smooth gear system to move as per requirement.  The electrical part would be the working of solar panel and battery requirement.  The electronics would involve designing the sensor system that would generate commands for the gear system to act accordingly.  The system employs spur gear for the implementation of the dual axis solar tracker.  The system is implemented using Atmel IC AT89C51. __  Electronics Projects for You

Eight-Solar Cell Lithium Ion Battery Charger Version 3 -  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. . . Circuit by David Johnson P.E.-May, 2013

Expanded Scale Battery Volt Meter -  This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system.  it was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems.  Lead acid batteries normally spend their working lifetime in the voltage range of 11-15 Volts.  This meter circuit __ Designed by G. Forrest Cook

Got Designs?
Please eMail
if you want me to link to and/or post your original design.  Thanks.

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Solar Cells:   #'s - E       F - O      P - S       T - Z

 


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