
Photo of an assembled LVD1 kit (IC sockets not included).	LVD1 wiring diagram

LVD1 - 12 Volt 15 Amp Low Voltage Disconnect Kit

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. The low-voltage signal is externally available, allowing computers to monitor the condition and perform a graceful shutdown. The low-voltage signal can also be used for triggering a variety of low-voltage warning systems.

The LVD1 has an on-board On/Off switch and an on-board Auto-on/Manual-on switch for both unattended and attended operation. It can control a 12V load of up to 15 Amps. The LVD1 is perfect for controlling solar-powered computer systems, radio repeaters and WiFi systems. With a simple extension circuit the LVD1 output logic can be inverted, allowing it to be used for automatically starting generators and AC-operated battery chargers.

An external source of 12V DC power is required, suitable power sources include a solar-charged battery or an automotive/marine electrical power system. The LVD1 is designed to operate in conjunction with the CirKits SCC3 solar charge controller, a 12V rechargeable battery and a photovoltaic (PV) panel.

Controls include an on-board Off/On switch and on-board Auto-on/Manual-on switch. Indicators include a red Load-on LED, an amber Low Voltage Detection LED and two green Calibration LEDs which can be jumper-disabled for saving power.

See the LVD1 specifications for details on the kit's capabilities.

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.

Solder is not included with this kit.

Kit Prices and Shipping

LVD1 kit: $44.95
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: $18.00 for 1 kit, add $3.00 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).
Wire transfers only accepted for orders over $500, $35 fee applies.
Sorry, NO COD.

Payment by PayPal / Credit Card

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	LVD1 U.S. Mail, First Class
	LVD1 U.S. Mail, Priority
	LVD1 Outside of U.S. / Overseas Orders

More Information

LVD1 Specifications and Features
LVD1 Schematic and Theory
LVD1 Assembly Instructions
LVD1 Alignment Instructions
Solar Powered 12V Ham Radio Station uses the LVD1 with other CirKits kits
Controlling a backup generator or charger with the LVD1
Alternative Energy Web Sites for sources of solar panels and batteries.
CirKits Home Page for more electronic kits.

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