5-pin SPDT (single pole, double throw) automotive relay.

Relays are essentially two parts in one package. The first part is an inductive coil (pins 85 and 86). This coil is the “trigger” function of the relay. By applying both a positive (+) and ground (-) to the contacts, current passes through the coil. When current passes through the coil, a magnetic field is generated and moves the switch (the arrow in the diagram). This is where the second part of the relay comes into play.

The second part of the relay is the “switch.” The switch has three interface contacts—common, normally closed, and normally open. “Normally” refers to the state of the relay not being energized.

While relays can be used for virtually any task, there are some very useful, simple applications for adding LED lighting to a vehicle. Please note that this wiring only pertains to the relay—not the wires in the vehicle. Before interfacing with a wire in a vehicle, always ensure you test the wire with a digital multimeter first to confirm circuit function.

Positive Switching

Positive switching is used for applications where the “trigger” for your switch or circuit is positive. This could be an ignition, brake, or reverse light wire for example.  This could be used for applications such as off-road light bars, work lights, additional brake lights, and other exterior lighting.

Negative Switching

Negative switching is used for applications where the “trigger” for your switch or circuit is negative. Negative triggers are often found in door, hatch, and trunk triggers as well as many interior switches. This could be used for applications such as footwell lighting, truck bed lighting, under-hood lighting, and other interior lighting.

Switch Activated With Ignition Override

This is useful for applications where you want to turn your light on or off with a switch but only want the light to remain on when the car is running or key is in the “ignition” position. The main advantage to this is—even if the switch is left on—the light (or output circuit) will shut off when the key is turned off so that the battery will not be run down.

For technical questions, don’t hesitate to call us toll free at 866-590-3533. Our customer service and technical support teams are available from 8:30 a.m. to 8 p.m. CDT Monday-Thursday and 8:30 a.m. to 4 p.m. CDT on Friday.

A matrix of electric vehicle charging stations are coming to Kauai soon.  Act 156, passed by the 2009 state legislature and signed into law by Governor Linda Lingle, set forth the first steps to integrate electric vehicles into the state’s transportation policy goals. The bill requires parking spaces for EVs (electric vehicles) in public and private facilities of 100 spaces or more to be available by the end of 2011.  This means all the major commercial parking places on Kauai will have electric car charging stations, so people will have access to plug in and charge up.  For those thinking of buying an electric car they can be assured of being able to recharge their vehicles when they are away from home.  To give the legislation a boost the state was awarded $2.6 million in federal grants to install and promote charging stations across the islands.

Six companies and organizations will receive grants from federal stimulus money. Grants were awarded to:

Blue Sky Electric has been invited to partner with AeroVironment for Kauai’s car charging installations.  Call us for more information about installing a station at your place of business or residence.

These systems are still expensive compared to the conventional electric generating plants such as hydro. And since they only generate power during the day, batteries or other storage systems are required to ensure power availability during the night or times when the conversion is low. This means spending more on batteries, which are currently the most popular storage devices.

Another limitation is the intermittent nature of light, making the energy unsuitable for some applications.

Space limitations may influence the maximum power that a consumer can generate. The cheaper panels have a lower conversion rate and require larger areas. However, customers may overcome this by using the more expensive but higher efficiency panels which require less space.

Improved photovoltaic technology, mass production and lower installation costs have seen the cost of photovoltaic systems and components such as batteries fall rapidly. Incentives such as financing, rebates, and wide acceptance by homeowners have influenced the use of the photovoltaic cells.