Examples
of Maximum Loads for PS Units & Inverters
| PS
300
300 Watts |
PS
600
600 Watts |
PS
1200
1200 Watts |
| 1
x PC + 17" screen + printer + standing lamp |
2-3
x PC's complete + LaserJet 4-in-one printer + PABX system |
5-7
x PC's compl. + LaserJet + PABX |
| OR |
OR |
OR |
| 1
x TV + VCR + DVD + Satellite Dish + standing lamp |
1-2
x Server(s) + Printer + Hub + PABX + Fax + Copier
|
3-4
Servers + Hub + LaserJet + Fax + Copier
|
| OR |
OR |
OR |
| 2
x POS terminals + Credit Card machine |
4
x POS terminals with credit card machines |
Microwave
oven (800W) + Fridge(300W) |
Please note: These are estimates and may not correspond
to your equipment.
All equipment should be checked for requirements prior to
purchase
Examples
of Watts Drawn by Common Appliances
Appliance(s) |
Estimated Power Requirement |
| Television, Decoder, DVD Total |
250 Watts |
| Computer with 17"/19" screen |
180 Watts |
| LaserJet printer |
250 Watts |
| Inkjet printer |
120 Watts |
| Printer/copier/scanner |
450 Watts |
| Microwave oven |
600-1200 Watts |
| Fridge/Freezer |
300-800 Watts |
| Fish tank pump & heater (most of this is for the
heater) |
800-1100 Watts |
| Garage Door / Electric Gate Motor |
300 Watts |
| Low Energy Bulbs (Recommended) |
6-15 Watts |
| Normal Bulbs |
60-100 Watts |
Please note: These are estimates and may not correspond
to your equipment.
All equipment should be checked for wattage prior to purchase
Backup
Time – How Long will it Work For?
Estimated
Backup Time
The formula to calculate backup time is Volts x Battery Amp
Hours / Watts
This is further simplified when applied to the PS Units as
follows;
PS300/600 1200/Watts Req. = Hours Backup (Take 80%
of this answer)
PS1200 2400/Watts Req. = Hours Backup (Take 80% of this answer)
E.g. You have a PS300 and you want to run your PC and Injket
Printer. You have checked and you have found out that your
PC needs 170Watts and your printer needs 115Watts i.e. 285Watts
in total. Your backup time is as follows ;
1200 / 285 = 4.2 Hours (Take 80%)
E.g. You have a PS600 and you want to run your TV, Decoder,
DVD, 2 Lamps (Energy Saver Bulbs), 3 Outdoor Security Lights
(wired up by your electrician) totaling 80 + 50 + 20 + 30
+ 270 = 450 Watts total. Backup time is;
1200/450 = 2.7 Hours (Take 80%)
E.g. You have a PS1200 and you want to run the Freezer in
the Garage, the Garage Door and 2 Outdoor Security Lights
(wired up by your Electrician). Add them up ; 320 + 300 +
180 = 800 Watts total. Backup time is;
2400/800 = 3 Hours (Take 80%)
Actual Backup Time
Actual backup time depends on a variety of
factors.
Your backup time may be longer as many appliances
do not constantly draw the max rated watts. For example, your
Fridge says it needs 200 Watts, but it only uses 200 Watts
during it’s ‘duty cycle’ i.e when the compressor
is running. When the compressor is off, it uses almost no
power. A fridge that is running efficiently will cycle 50%
compressor on, 50% compressor off. However a fridge may draw
more power than stated if it is very full, opened a lot, in
a very hot environment or not working efficiently. This would
reduce backup time. Backup time may also be reduced if your
battery bank is not fully charged, or if it is old and has
begun to deteriorate.
Very Important: You should
NEVER run your battery 100% flat. When the PS Unit begins
to beep, it means that you have discharged your battery to
a depth of 80% and you should now turn the unit off. Discharging
your battery further will result in shortened battery life.
Please note: These are estimates and may
not correspond to your equipment.
All equipment should be checked for wattage prior to purchase
Things to consider:
Before you purchase a home/farm/small business
back-up power system you should consider the following facts.
Backup systems and battery’s are very expensive and
every appliance that you choose to run on the back up system
which is not absolutely necessary can increase the cost of
the backup system drastically. We therefore recommend that
you carefully consider which appliances should run on the
backup system after a power failure. Remember that all systems
can be used as stand alone units or can be hard wired into
the current electrical system by a qualified electrician.
Before we can size the correct back up system you
must consider the following:
1. Which items are absolutely necessary to
be run on the back up system after power failure?
2. Write down the power requirements of each appliance/item
in WATTS, VA or Amps. These are normally found on the product
labels on the appliance or in the appliance manual.
3. Calculate the total wattage of all items which will be
run on the backup system.
4. Consider that the most applicable back up time will be
for your area. In other words, how long are the power failures
that you normally experience in your area.
Upgradeable System
This system does exactly the same as the
PS Units, the only difference is that the system can grow
with the needs of the customer and can be expanded more easily
to suite jour every need, this system also allows for future
upgrades to incorporate solar panels/power to power the system.
Installation of this unit is preferably by hard wiring to
the current electrical system by a qualified electrician. |
