Solar Battery Backup Systems
Off Grid or Grid Tied
Solar battery backup
systems are a cost effective way to provide electricity to
power the essential circuits in your home or office
independent from grid power. When the grid is down,
your protected loads like refrigeration, lights in critical
areas, communications and medical devices operate from your
solar energy stored in batteries. Your battery backup
system can be totally independent from the grid, or may also
be grid tied. Either way, your utility bill will be
reduced and your important circuits operational.
Off Grid Solar Battery Backup Grid
A grid independent system
backup or uninterruptable
battery produced alternating current or direct current to
operate your important electrical circuits like computers,
lights and appliances in the event of a loss of grid power.
These electrical loads can be operated from your off grid
system and reduce your utility expense.
Off Grid Solar Battery Backup Grid Tied
Some utilities will allow
your off grid battery backup system to also be grid tied so
that when you are not using all of the energy that is
available it can be used to reduce your electric bill.
Need to Know to Size Your System
circuits (electrical loads) do you need to operate when
the grid is down?
many hours do you need these circuits to operate?
appliances, look at the
Energy Star appliance power requirements.
are the peak load (watts) for all of the circuits and
devices may be run simultaneously?
is the voltage required (120 vs. 240 VAC)
may days of backup do you require?
outages in your area likely to be accompanied by long
periods of inclement cloudy weather?
Things to Consider
freezers, lights in important areas, ventilation, TV,
radio, computer, cell phone charger, alarms and medical
devices are the most essential loads to consider.
Heating systems vary
widely and may or may not be practical to operate.
Air handlers on
furnaces can be very large energy loads, even if the
heat source is gas.
Inductive loads like
electric stoves, heaters, electric water heaters require
240 VAC and are high energy users
The larger the loads
and the longer they run, the more expensive the system
Do you have or can
you add a generator if the backup needs to be larger or
A protected loads
panel is far more convenient and cost-effective than
analysis is worth the time and will result in a more
cost effective investment and operating performance that
meets your needs.
We used to be able to
assume that power outages are a rare event. The truth
is that in 2008 the majority of grid failures were caused by
faulty equipment, human error and judgment or animals, not
major disasters. More recently global warming is driving
more frequent and intense storms that have had widespread
disastrous consequences leaving millions of homes at a time
without power. A solar powered battery backup system will keep you
and your loved ones prepared and safe should the power fail.
Solar Battery Backup System Sizes
3,600 watts peak load
at 115 VAC
12 each 250 watt
24 volt solar panels
405 amp battery
bank at 24 volts DC
Enough energy to
operate a refrigerator, freezer 24/7 and lights and
other limited use loads
A system like
this can be upsized by increasing the battery bank
voltage and number of solar panels to 15-18 modules,
the system will be limited to 115 VAC loads only
8,000 watts peak load
at 115/230 VAC 40 amps peak at 230 volts
Up to 30 each 250
watt 24 volt solar panels
1,215 amp battery
bank at 48 volts DC
Enough energy to
operate a small house with limited 230 VAC loads
A system like
this can be upsized by adding one or more additional
inverters, increasing the battery bank size and
number of solar panels
An Outback Power Flexpower One system
that meets the requirements of a
3,500 watt 115 VAC system. The system comes prewired on a
Hang on the wall and start wiring. The battery bank is
8 each Sun Xtender
405 amp 6 volt batteries wired 4 in series two strings
parallel to make 910 amps
at 24 volts. Photo courtesy of Juan Wilson in
Hanapepe, Hawaii. Visit
Successful Off Grid Solar Design download which tells
you much of what you need to know to size your system.
Please contact us today
for assistance. If you have not done your load
calculations there won't be much to discuss. It all
starts with knowing your loads.
If you have
questions or need assistance, we are ready to help.
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