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Solar Cell Circuits  

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

Last Updated: October 18, 2017 05:04 AM

Circuits Designed by Dave Johnson, P.E. :

12v_To_24v_Solar_Battery_Charger -  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. . . . Hobby Circuit by David Johnson P.E.-July, 2017

1w Solar Cob LED Light -  Chip on board (COB) LEDs are all the rage.  These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover.  The metal back allows the assembly to be mounted to heat sink to keep the device cool.  The multiple LED chips can be wired into any number of series/parallel configurations.  Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. . . . Circuit by David Johnson P.E.-May, 2017

1w Solar Path Light2 -  Chip on board (COB) LEDs are all the rage.  These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover.  The metal back allows the assembly to be mounted to heat sink to keep the device cool.  The multiple LED chips can be wired into any number of series/parallel configurations.  Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. . . . Circuit by David Johnson P.E.-May, 2017

24v NiMH Battery Charger using a 12v Solar Panel  -  A while back I received 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 . . . Hobby Circuit designed by David A. Johnson P.E.-October, 2011

8-Solar Cell Lithium Ion Battery Charger Version 2 -  Jim Wilber looked at my design for a battery charger and sent me some suggested changes.  He suggested using the LTC4412 ideal diode IC to switch off the current path from the solar cell to the battery in darkness.  He also noted that the 2.5v regulator from Seiko I had selected was no longer in production and suggested using the shunt reference. . . Circuit by David Johnson P.E.-May, 2013

8 Solar Cell LED Light -  I have been modifying a lot of solar garden and path lights for the last several years.  I buy some units from home improvement stores, then I gut them completely.  I take out the battery, electronic control board, LED and solar panel.  I then replace those components with new units.  I increase the size of the solar panel and battery.  I use a more efficient and brighter LED . . . Circuit by David Johnson P.E.-September, 2017

 9v Solar Panels Converted to 4.5v Panels -  Three 1.2v NiMH cells wired in series are perfect for powering white LEDs.  The 3.6 volts from such a battery bank is a good match for a 3v white LED. Only a single resistor is needed between the battery and the LED to limit the current.  The ideal solar panel voltage when charging three 1.2v NiMH cells, is 4.5v, using 9 solar cells.  A 1N5817 Schottky diode is usually wired between the solar panel and the battery pack, to prevent battery current from leaking back into the panel at night. . . . Circuit by David Johnson P.E.-July, 2017

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

12 Volt 20 Amp Solar Charge Controller (kit available) -  The SCC3 is a solar charge controller, its function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery.  it features easy setup with one potentiometer for the float voltage adjustment and an equalize function for periodic overcharging.  Automatic temperature compensation optimizes battery charging over a wide range of temperatures.  The SCC3 is robust, it can handle reverse polarity connection of both the battery and photovoltaic panel.   __ Designed by G. Forrest Cook

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

12/24V MPPT Solar Charge Controller Rev.1 -  Mix-it: An Easy-To Build 4-Channel Mixer__ SiliconChip

12V 10A Dark Activated Switch -  The DAS1 kit can be used to automatically turn on 12V lamps when it becomes dark.  it has an on-board switch for selecting Off, Always On and On-at-Dark (Auto) operation.  The DAS1 can control up to 10 Amps of 12V DC lighting, it also includes two ultra-bright white LEDs for a low power self-contained light source. __ Designed by Solar Orbit Kit

12V 15A Low Voltage Disconnect -  The LVD1 kit is used for automatically controlling the power to 12V solar-powered battery-operated electronic devices.  it shuts down power when the battery voltage drops to a selected voltage, protecting the battery from damaging excessive discharge conditions.  Power is either automatically or manually reconnected at a selected voltage when the battery is recharged.  An adjustable low-voltage indicator warns of the impending power outage.   __ Designed by Solar Orbit Kit

12V 20A 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 controller is an essential part of any solar power system.  A 12 Volt solar power system can provide power to a wide variety of devices such as lighting systems, Ham and CB radios, car stereos, cell phone chargers, laptop computers, televisions, recording equipment, fans, water pumps and other 12V DC loads.  With the addition of a DC to AC inverter, the DC power can be converted to 120 Volts AC for running many household electronic devices. 
 __ Designed by G. Forrest Cook

12V 9A Solar Power Center -  The SPC3 kit contains all of the circuitry for a medium-sized solar power system.  it includes a solar charge controller for battery charge regulation, a smart on/off power switch with automatic low voltage disconnect operation and a built-in white LED lighting system.  Additional lights and other 12V devices can be connected to the load terminals and controlled by the SPC3.  The SPC3 can regulate up to 9 amps of incoming solar power and can switch an external load of up to 10 amps. __ Designed by Solar Orbit Kit

12V LDO Solar Charge Controller -  This Low Dropout Voltage (LDO) solar charge controller uses a simple differential amplifier and series P channel MOSFET linear regulator—their compatibility seems like a marriage made in heaven.  Voltage output is adjustable.  it is mainly intended for charging 12V lead-acid batteries.  Solar Charge Controller Specifications __ Designed by Jim Keith

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

12V, 4-AA Cell Differential Temperature Charger -  This project makes a number of improvements over my Temperature Controlled NIC D Charger circuit.  The new circuit runs on 12VDC, allowing it to be used in a car or from a 12V solar power system.  Additionally, a current sensor LED verifies that the cells are receiving charging current.  Note that the current sensor circuitry __ Designed by G. Forrest Cook

1381 Solar Engine -  Well the most common use is in a solarollerwhich 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 with this circuit are mainly mechanical such as my artistic butterflies.  One other common use is a little thing called a symet which can roam around and not get stuck using only one motor.   __ Designed by Mark W. Tilden mwtilden @ lanl.gov

1381-based Solar Engine -  Voltage-Controlled Solar Engine: Two simple solar engine designs using a 1381* voltage discriminator.   __ Designed by Wilf Rigter

20 Amp 12 Volt Solar Charge Controller (kit available) -  The SCC3 is a solar charge controller, its function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery.  it features easy setup with one potentiometer for the float voltage adjustment and an equalize function for periodic overcharging.  Automatic temperature compensation optimizes battery charging over a wide range of temperatures.  The SCC3 is robust, it can handle reverse polarity connection of both the battery and photovoltaic panel.   __ Designed by G. Forrest Cook

24v NiMH Battery Charger using a 12v Solar Panel  -  A while back I received 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 . . . Hobby Circuit designed by David A. Johnson P.E.-October, 2011

3A 6V/12V Solar Charge Control -  This solar charge control combines multiple features into a single design: 3A current rating, low dropout voltage (LDO) , range of voltage adjustment (accommodates 6 & 12V lead-acid batteries) , reverse polarity protection, low parts cost ($5.90) and low parts count (14 components).  High performance is attributed to the __ Designed by Jim Keith

555-based solar engine -  Time-Controlled Solar Engine: a solar engine design using a 555 timer IC  __ Designed by Wilf Rigter

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

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.   __ Contact Collin Mitchell

5V solar power supply -  The Solar Garden Light can be bought for less than $5.00! !  Kits for the 5v Solar Power Supply can be bought from Talking Electronics. __ Designed by Collin Mitchell

6a, 6v Relay Solar Charge Control -  This 6V solar charge regulator meets most small-scale 6V application requirements.  With a current rating of 6A, it can handle up to a 50W solar panel.  its principle of operation is very simple and there is only one adjustment: cut-out voltage.  Many inexpensive commercial solar charges available use, I believe, this technique.  However, this particular […]__ 

6V LDO Solar Charge Controller -  This Low Dropout Voltage (LDO) solar charge controller is a variation of the previously posted 12V LDO controller.  it is optimized for charging a 6V lead-acid battery with a 9V solar panel.  Minimum voltage drop is less than 1V.  it uses a simple differential amplifier and series P channel MOSFET linear regulator.  Voltage output __ Designed by Jim Keith

6v Solid State Switch Solar Charge Control -  This is a Solid State Switch upgrade to the 6A, 6V Relay Based Solar Charge Regulator.  Solid state switching provides longer life, smaller size and higher efficiency than a relay.  in addition, the clock frequency may be doubled in order to better track battery load /charging requirements.  The parts cost is essentially identical.  One drawback__ 

70W, Solar Energy Harvester with Maximum Power Point Regulation -  The LT3763 is a fixed frequency, synchronous, step-down DC/DC controller designed to accurately regulate output currents up to 20A.  The average current mode controller will maintain inductor current regulation over a wide output voltage range from 0V to 55V.  Output current is set by analog voltages on the CTRL pins and an external__ Linear Technology/Analog Devices App Note, Oct 10th 2012

8-Solar Cell Lithium Ion Battery Charger Version 2 -  Jim Wilber looked at my design for a battery charger and sent me some suggested changes.  He suggested using the LTC4412 ideal diode IC to switch off the current path from the solar cell to the battery in darkness.  He also noted that the 2.5v regulator from Seiko I had selected was no longer in production and suggested using the shunt reference. . . Circuit by David Johnson P.E.-May, 2013

9 Amp in / 10 Amp out Solar Power Center (kit available) -  The SPC3 is a solar power center, it can handle all of the power functions for a solar charged 12 Volt DC system.  The SPC3 contains a 9 amp photovoltaic charge controller, a 10 amp low voltage load disconnect circuit and a pair of built-in white LEDs for area illumination.  The low voltage disconnect circuit has a load on-off switch and a battery low voltage indicator.  By using the SPC3 as the center of a solar powered device, long battery life is assured.  The SPC3 can be used for a stand-alone solar lighting system, it can also be used for making solar powered audio and radio devices. __ Designed by G. Forrest Cook

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

 


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