How This Calculator Works
We created this tool to help you calculate how much energy/electricity you can save for your residential lighting by implementing DC (direct current) power, and intelligent controls such as daylight harvesting and occupancy sensing.
This calculator assumes that your residential lighting is currently powered by AC (alternating current) power, which is the type of electricity distributed by power grids. It also assumes that your current system has no level of automation other than on-off controls (i.e. wall switches or thermostats).
First, this calculator calculates the current total cost of your lighting based on number of fixtures, watts required per fixture, average cost of electricity, and average hours of daily use (HOU).
Next, the calculator subtracts the amount of energy that could be saved from the original cost of powering your residential lighting.
Where Energy Savings Come From
By automating residential lighting systems to respond to occupancy or available natural light, energy can be saved by ensuring that lighting is used only when necessary.
DC Power Distribution
If you're powering LED lighting, it needs DC power to operate (rather than the AC power it's getting). If LED lighting gets AC power, individual fixtures must convert the AC power they get into the DC power they need; this can be a very inefficient process (wasting up to 40% of the energy consumed by a fixture
when it's turned on). Implementing a DC power distribution system eliminates the need for these inefficient, AC to DC conversions. This ultimately saves energy, reduces your electricity bill, and lengthens the lifespan of LED light bulbs and fixtures.