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Photo of an assembled SPC3 kit.
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SPC3 wiring diagram
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SPC3 - 12 Volt 9 Amp / 10 Amp Solar Power Center Kit
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.
The SPC3 can be used as a stand-alone solar powered
lighting system controller for a one room building or RV/camper.
The SPC3 can also be used to power other 12V loads such as radios,
communication equipment, small TVs, recording equipment, fans,
cameras and more.
The SPC3 can be installed in both stationary and mobile environments.
The SPC3 should not be used for powering devices with high surge
currents such as large motors or high powered car stereos.
The SPC3 charge controller section includes:
a battery float voltage adjustment, a red/green Charge/Float state indicator
LED and battery equalize terminals for occasional overcharging.
A temperature sensor is included so that solar battery charging is
temperature compensated.
The SPC3 load controller section includes: a momentary action on/off switch for
turning the load power and built-in white LEDs on and off, two bright
white LEDs for a built-in light source, a low battery indicator LED that warns
of impending shutoff and a low voltage disconnect circuit that disconnects the
load when the battery discharges below a preset minimum voltage.
See the
SPC3 specifications for more detailed information on the circuit.
The SPC3 Photo Gallery
shows some real-world uses of the SPC3.
Combine the SPC3 with a solar panel, rechargeable battery and external
lights or other load devices for a reliable source of DC power that's
available, even when the power company is not.
The SPC3 kit makes a great student project, it can be used as the
foundation for many science and electronics projects.
The kit includes:
- A high quality double sided, silk screened circuit board.
- All of the parts required for building the board.
- A schematic and wiring diagram.
- Easy step-by-step assembly, alignment and usage instructions.
Batteries, solar panels, load devices and solder are not included with
this kit.
Follow the Alternative Energy Web Sites link below for solar panel and battery suppliers.
Kit Prices and Shipping
- SPC3 kit: $54.95
- Discounts are available for orders of 10 or more kits.
- U.S. addresses, First Class Mail shipping and handling: $5.00 per kit, add $1.00 each for additional kits.
- U.S. addresses, Priority Mail shipping and handling: $10.00 per kit, add $2.00 each for additional kits.
- Overseas, Canada and South/Central America addresses, Shipping and Handling: $10.00 for 1 kit, add $2.00 each for additional kits.
- Send email for a quote on multiple kit types, please use the address at the bottom of this page.
Payment Methods
- Credit cards (click the PayPal buttons below).
- Mail a postal money order from a U.S. bank such as American Express, Wells Fargo or Western Union.
- Mail a personal check (U.S. customers only).
- Wire transfers only accepted for orders over $500, $25 fee applies.
- Sorry, NO COD.
Taxes (Colorado Residents)
Customers who live in Colorado should add 7.66% tax to the total price of the merchandise
($4.21 per SPC3 kit).
Payment by Credit Card
(Click on the PayPal buttons)
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SPC3 U.S. Mail, First Class
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SPC3 U.S. Mail, Priority
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SPC3 U.S. Mail, First Class (Colorado Customers)
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SPC3 U.S. Mail, Priority (Colorado Customers)
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SPC3 Outside of U.S. / Overseas Orders
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Payment by Mail
If you would like to mail your payment, total the
price of the kit or kits
with the desired form of shipping and tax if you live in Colorado.
Include the address to ship to and an email address if you would
like shipping confirmation.
Send checks or postal money orders to:
CirKits-www
P.O. Box 3500
Boulder, CO 80307-3500
USA
Your order will be processed and mailed when the payment has been received.
More Information
Email: 
This is a de-spammed email address, you need to type it in.