Completely
Pre-Assembled Inverter Power Panels
Call toll-free
(877) 297-0014 to speak
with an experienced representative for reviews or advice.
Considerations
when contemplating a solar power panel:
Conservation
Conservation
plays an important role in keeping down the cost of a photovoltaic
system. The use of energy-efficient appliances and lighting, as
well as non-electric alternatives wherever possible, can make
solar electricity a cost-competitive alternative to gasoline generators
and, in some cases, utility power.
Cooking,
Heating and Cooling
Conventional
electric cooking, space heating and water heating equipment use
a prohibitive amount of electricity. Electric ranges use 1500
watts or more per burner, so bottled propane or natural gas is
a popular alternative to electricity for cooking. A microwave
oven has about the same power draw, but since food cooks more
quickly, the amount of kilowatt hours used may not be large. Propane
and wood are generally better alternatives for space heating.
Good passive solar design and proper insulation can reduce the
need for winter heating. Evaporative cooling is a more reasonable
load than air conditioning and in locations with low humidity,
the results are almost as good. One big plus for solar cooling:
the largest amount of solar energy is available when the need
for cooling is the greatest.
Lighting
Lighting requires
the most study since many options exist in type, size, voltage
and placement. The type of lighting that is best for one system
may not be right for another. The first decision is whether your
lights will be run on low voltage direct current (DC) or conventional
110 volt alternating current (AC). In a small home, an RV, or
a boat, low voltage DC lighting is often the best choice. DC wiring
runs can be kept short, allowing the use of fairly small gauge
wire. Since an inverter is not required, the system cost is lower.
When an inverter is part of the system, and the lights are powered
directly by the battery, a home will not be dark if the inverter
fails. In addition to conventional-size medium-base low voltage
bulbs, the user can choose from a large selection of DC fluorescent
lights, which have 3 to 4 times the light output per watt of power
used compared with incandescent types. Halogen bulbs are 30% more
efficient and actually seem almost twice as bright as similar
wattage incandescents given the spectrum of light they produce.
High quality fluorescent lights are available for 12 and 24 volt
systems. In a large installation or one with many lights, the
use of an inverter to supply AC power for conventional lighting
is cost effective. AC compact fluorescent lights will save a tremendous
amount of energy. It is a good idea to have a DC-powered light
in the room where the inverter and batteries are in case there
is a problem. AC light dimmers will only function properly on
AC power from inverters that have pure sine wave output.
Refrigeration
Gas powered
absorption refrigerators are a good choice in small systems if
bottled gas is available. Modern absorption refrigerators consume
5-10 gallons of LP gas/month. If an electric
refrigerator will be used in a standalone system, it should be
a high-efficiency type. Some high-efficiency conventional AC refrigerators
use as little as 1200 watt-hours of electricity/day at a 70º
average air temperature. A comparably sized Sun Frost refrigerator/freezer
uses half that amount of energy and a SunDanzer refrigerator (without
a freezer) uses less than 100
watt-hours per day. The higher cost of good quality DC refrigerators
is offset by savings in the number of solar modules and batteries
required.
Major Appliances
Standard AC
electric motors in washing machines, larger shop machinery and
tools, swamp coolers, pumps, etc. (usually 1/4 to 3/4 horsepower)
require a large inverter. Often, a 2000 watt
or larger inverter will be required. These electric motors are
sometimes hard to start on inverter power, they consume relatively
large amounts of electricity, and they are very wasteful compared
to high-efficiency motors, which use 50% to 75% less electricity.
A standard washing machine uses between 300 and 500 watt-hours
per load, but new front-loading models
use less than 1/2 as much power. If the appliance is used more
than a few hours per week, it is often cheaper to pay more for
a high-efficiency appliance rather than make your electrical
system larger to support a low-efficiency load. Vacuum cleaners
usually consume 600 to 1,000 watts, depending on how powerful
they are, about twice what a washer uses, but most vacuum
cleaners will operate on inverters larger than 1,000 watts since
they have low-surge motors.
Small Appliances
Many small
appliances such as irons, toasters and hair dryers consume a very
large amount of power when they are used but by their nature require
very short or infrequent use periods. If the system inverter and
batteries are large enough, they will be usable. Electronic equipment,
such as stereos, televisions, VCRs and computers have a fairly
small power draw. Many of these are available in low voltage DC
as well as conventional AC versions. In general, DC models use
less power than their AC counterparts.
Call
toll-free (877) 297-0014
to speak with an experienced representative.