OkSolar
Electrical ~ Solar Energy Terms
AC-Alternating
current. Electrical energy which reverses its direction at regular
intervals.
AC Daily Power Budget-
The daily amount of watts your AC appliances use.
AC
Inverter and
Battery Power Allowance-
Running an inverter draws a small amount of power from your battery.
So does keeping power stored. The inverter and battery allowance in
your power calculations help make certain enough power will be
produced to keep your battery from running in the red.
Adjusted Total Daily Power Budget-
A total daily power budget may be changed to meet certain situations.
For instance, if you spend only weekends at a house, then your
adjusted total daily power budget will be lower. Adding a generator to
your system also reduces your total daily power budget. The adjusted
daily power budget provides the figure that determines the size of you
solar electric power system.
Ampere or amp-
Electric current is measured in amperes or amps.
Amp
Hours
– The number of amps used or produced in a given hour equals the
number of hours. Batteries are rated in amp hours.
Array
– A group of solar electric modules connected together in a power
system.
Battery Bank
– A group of batteries wired together to store power in a solar
electric system. Allows you to use the stored power at night, on
cloudy days or to run more power than the array can produce at one
time.
Centrifugal
(Water Pumping) – Rotating outward, away from the center, as in
centrifugal force.
Controller
_ Simply put, the controller regulates the current from solar charger
to your battery bank.
Current –
The rate of flow of an electric charge. Current is measured in amps.
DC – Direct current. Electrical energy flowing in one
direction and of substantially constant value.
DC Daily Power Budget
– The number of watts your DC appliances use daily.
Fall
(Water Pump/Hydro Sections) – The vertical descent of water, usually
measured in vertical feet. Also called "head".
Flow
Rate
– Speed at which water moves.
GPM
– Gallons per minute.
Ground Mount
– A piece of equipment upon which solar modules are mounted.
Head
– See "Fall".
Hertz or HZ
– The frequency of electrical current described in cycles per second.
Appliances in the U.S. use 60 HZ. Appliances in other countries
generally use 50 HZ.
Hydroelectricity
– Electricity created by water power.
Hydrometer
– An instrument used to measure state-of-charge (voltage) of a
battery.
Inverter
– An Appliance used to convert independent DC power into standard
household AC current.
Kilowatt or KW
– a thousand watts. (See Watts.)
LED
–
Light emitting diode. These lights are often used to indicate low
power on modern electronic equipment.
Line Loss
– Voltage drop over the length of electric line wire. Line loss robs
your system of power when wire is too small for the load being run
through the line or when voltage is too low for the distance the power
must travel.
Load
– The lights or appliances run by your electrical system.
MA
– Milliamps, 1000 MA = 1 amp.
Module
– Modular solar electric charger; used interchangeably with solar
electric panel.
Parallel Wiring
– A system of wiring, for solar electric modules of batteries, which
increases amperage. Parallel wiring is "+ to +" (positive to positive)
and " – to – " (negative to negative).
Photovoltaic
– Converting light into electricity. Photo means "light" voltaic means
"electric". Often referred to as "PV" for short. More commonly
referred to as "solar electric".
PSI
– Pounds per square inch.
Self-Regulating
– Some modules have a special circuitry which keeps the battery from
overcharging. This means that no controller is needed when the
self-regulating module is properly matched to battery storage
capacity.
Series Wiring
– A system of wiring, for solar electric modules or batteries, which
increases voltage. Series wiring is + to – (positive to negative).
Single-Crystal Silicon
– Many solar chargers use single-crystal solar cells as they are the
most efficient cell on the market. Pure silicon is grown into
crystalline ingots which are cut into thin slices to make solar
electric cells. These cells are then soldered together to meet the
charger’s voltage and current requirements.
Solar Cell
– The smallest basic solar electric device which generates electricity
when exposed to light. Solar Electric – The preferred term used to
describe something which uses sunlight to produce electricity.
"Photovoltaic" is the more technical term.
Thin
–Film Silicon
– The tiny solar chargers found in calculators and wristwatches are
solar thin-film. Thin-film solar chargers are made by spreading a
micro-thin layer of silicon on glass and creating the voltage and
current circuits using laser technology. Thin-film chargers are
produced in sizes from the microscopic calculator chip, up to the
1’x4’ power module.
Total
Daily Power Budget
– In a DC system, the daily amount of watts your DC appliances use,
plus the battery power allowance. In a DC and AC system, the daily
amount of watts DC and AC appliances use, plus battery and inverter
power allowances.
Voltage or Volts
– Voltage is the rating of the amount of electrical pressure that
causes electricity to flow in the power line. If electricity were
water, voltage would measure the amount of pressure at the faucet.
Watts –
A watt is a measurement of total electrical power. Volts x amps =
watts.
Watt Hour
– The quantity of electrical energy used or produced when one watt is
used for one hour.
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