Solar Battery Chargers

A solar charger employs solar energy to supply electricity to devices or charge batteries. They are generally portable.

Solar chargers can charge lead acid or Ni-Cd battery banks up to 48 V and hundreds of ampere-hours (up to 4000 Ah) capacity. Such type of solar charger setups generally use an intelligent charge controller. A series of solar cells are installed in a stationary location (ie: rooftops of homes, base-station locations on the ground etc.) and can be connected to a battery bank to store energy for off-peak usage. They can also be used in addition to mains-supply chargers for energy saving during the daytime.

Most portable chargers can obtain energy from the sun only. Examples of solar chargers in popular use include:

  • Small portable models designed to charge a range of different mobile phones, cell phones, iPods or other portable audio equipment.
  • Fold out models designed to sit on the dashboard of an automobile and plug into the cigar/12v lighter socket to keep the battery topped up while the vehicle is not in use.
  • Flashlights/torches, often combined with a secondary means of charging, such as a kinetic (hand crank generator) charging system.
  • Public solar chargers permanently installed in public places, such as parks, squares and streets, which anyone can use for free.

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Cost to Run Annually

This is the estimated cost to operate annually based on 12 cents per kWh ( The annual estimated amount to operate annually is entered by the vendor and or manufacturer.

Energy Generator

Miles Driven by an Average Passenger Vehicle

Passenger vehicles are defined as 2-axle 4-tire vehicles, including passenger cars, vans, pickup trucks, and sport/utility vehicles.
In 2011, the weighted average combined fuel economy of cars and light trucks combined was 21.4 miles per gallon (FHWA 2013). In 2011, the ratio of carbon dioxide emissions to total greenhouse gas emissions (including carbon dioxide, methane, and nitrous oxide, all expressed as carbon dioxide equivalents) for passenger vehicles was 0.988 (EPA 2013a, EPA 2013b).
The amount of carbon dioxide emitted per gallon of motor gasoline burned is 8.89 × 10-3 metric tons, as calculated in the “Gallons of gasoline consumed” section above.
To determine annual greenhouse gas emissions per mile, the following methodology was used: carbon dioxide emissions per gallon of gasoline were divided by the average fuel economy of vehicles to determine carbon dioxide emitted per mile traveled by a typical passenger vehicle. Carbon dioxide emissions were then divided by the ratio of carbon dioxide emissions to total vehicle greenhouse gas emissions to account for vehicle methane and nitrous oxide emissions.
Note: Due to rounding, performing the calculations given in the equations below may not return the exact results shown.
8.89 × 10-3 metric tons CO2/gallon gasoline × 1/21.4 miles per gallon car/truck average × 1 CO2, CH4, and N2O/0.988 CO2 = 4.20 x 10-4 metric tons CO2E /mile
•EPA (2013a). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011. Chapter 3 (Energy), Tables 3-12, 3-13, and 3-14. U.S. Environmental Protection Agency, Washington, DC. U.S. EPA #430-R-13-001 (PDF) (505 pp, 12.3MB)
•EPA (2013b). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011. Annex 6 (Additional Information), Table A-275. U.S. Environmental Protection Agency, Washington, DC. U.S. EPA #430-R-13-001 (PDF) (505pp, 12.3MB)
•FHWA (2013). Highway Statistics 2011. Office of Highway Policy Information, Federal Highway Administration. Table VM-1.

Equivalent to 0 miles driven by an average passenger vehicle

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