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Residential Load Controllers
Frequently Asked Questions
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Let there be no
Automated Power Systems is in
no way related to, sponsored, endorsed by or affiliated with
Public Service Company aka: APS, an Arizona based electric utility
Easy way to remember: They sell power, we help you conserve
What is a load controller?
A load controller is a computer that
monitors your power usage and controls peak demand
by shedding loads such as:
A/C unit(s), Clothes Dryer, Water Heater(s), Spa Heaters, etc),
These appliance are connected and
controlled by the load controller and not allowed to run at the same time which
causes high demand charges.
Load controllers work in conjunction with electrical rates
that have a
demand charge. Since the demand charge on many energy bills can
be as much as the consumption, controlling demand significantly reduces
your electric bill. Think of it as a cruise control for your power
bill. You set it where you want it. The lower you set it,
the more you save.
What is Demand?
Demand is the highest usage of electrical power during a given period. For Arizona Public Service residential
users, this time period is sixty minutes. This is the APS Combined
For Salt River Project residential customers
that have a PV solar system installed
the demand window is 30 minutes.
The SRP rate is called
Generation Customer plan
You are charged for the highest average demand reached during the on peak
time period. Demand is measured in time and in amount. The typical
measurement used 1000 watts or 1KW averaged
given time period.
current charge for APS is
$13.50 per KW. Simple math dictates a demand of 10KW would equate to
$138.50 for one hour usage of power! Cutting this in half (easy to
accomplish with a load controller), would reduce your bill by almost $60 per
Demand rates are expected to rise to $16/kW
making this investment pay off even faster.
The SRP demand rate schedule once you hit 10kW
is $35/kW for the highest 30 minute period. 10kW x $35 is $350 just in
demand charges, This does not include how much power you
What causes high demand levels?
Examples of KW loads in a residence:
Clothes Dryer: 6KW
Water Heater: 4.5KW
Ton Heat Pump:
5.6KW (1.6 KW/ton)
8KW (15 year old heat pump: 11KW)
2.5KW per burner
pump (per pump)
Since the meter measures an average of power usage,
adding the KW values above would not be how the meter reads your usage.
Example: Let's say a 5 ton heat pump consuming 8KW runs 10 minutes on, 10
minutes off. The average demand that the meter (and the load
controller), "sees and reads" is a 4KW load. A water heater
uses 4.5KW but can run for a full 60 minutes (the APS demand time window), after
a load of clothes in the washer using hot water and therefore would contribute
4.5KW to the months demand bill.
What Does a Load Controller
On most all electric homes, the load
controller is connected to the heat pump(s), the clothes dryer heating element
(so the tumbler keeps spinning), and the electric hot water heater. Years
of experience has shown that pools should run at night during off peak periods
and ranges/ovens do not need to be connected. Since the microprocessor in
the load controller is aware of all loads being used, (not just the ones
connected to it), when the demand needs to be controlled the load controller
will shed loads to allow the use of the range or oven. If set
correctly and programmed you won't even know the load controller is working
until you open your energy bill each month and see the reductions.
I Have Natural Gas, Can a Load
Absolutely. Your savings
won't be as high as an all electric home but you will be able to lower your
demand more because of less appliances using 220v to operate. Lower
demands means lower bills. The recently introduced APS rate is one of the
lowest in the country and compatible with our load controllers. We know, we have
been doing this since 1981.
How much does a load
How many options do you want? How many loads are
being controlled? How many WIFI integrated thermostats would like
installed? ($400 each), How many appliance sensors would you like to
How long does it take to install?
installation time is two hours. Less on smaller homes, a bit longer on
Do Load Controllers Need To Be
No, once installed it is very rare to
have a problem with them and they do not require maintenance or check
Pensar Units have high quality enclosed relays that are
overrated for their duty and units we have installed in
How do I know what's going on? How do I
The older load
controllers were fairly straightforward and had a LED read out for the modes:
* Demand Set Point
* Current Demand
* Past Period Average (your average usage
in the last 60 minutes)
* Highest Demand
The newer cloud based systems are far more complicated to
interface with and end users have to pay
$99/year for access fees
to have any changes made.
How They Work
Current transformers are placed
around the main buss bars in your electrical panel and measure power
consumption. This information is read and recorded by the
Every light bulb, appliance and outlet is recorded
and archived in a cloud based system.
We have other solutions!
We have been field testing an
alternative to installing a load controller which has proven itself to
40% to 50% (or more) reductions in your energy bill. Since we manufacture
our own desert
tested products we have been testing on full size single and
two story homes and they are all
What a load controller
Make your house more comfortable
a smaller solar power system
Make your heat pump or a/c unit last longer
Reduce your energy consumption (load controllers only
juggle loads, your consumption
stays the same)
Make your life easier (the new units are very hard to
learn how to use and cost $99/year
What our proven "Demand Reduction
Package" can do:
Doubles whatever life you have left
in your a/c or heat pump (we warranty this in
Significantly increases the comfort
of your home both winter and
Reduces heat gain through windows and
Cloud based, 24/7 monitoring of
your power usage on your PC/tablet/Smart Phone and will alert you if your
demand rises above your desired level. You will get a text
or phone call alerting
No controller to install, set,
change or learn how to use, no hassles and NO FEES!
Significantly reduced consumption and
Demand is guaranteed not to exceed
Free cloud access, no $99/year
charges for our system
Increased indoor air
Faster return on your
Lasts for the life of your
Before considering spending $3500+ on a load controller,
reach out to us for an in home audit and we will share with you 37 years of experience in
reducing demand levels.
Before considering installing a load controller, ask
how long the company installing your load
controller has been doing it. Many just started this year.
Email us at email@example.com with
your contact information, what you would like to accomplish
and the best time to reach you.
This is the Pensar System 1000 which is no longer
manufactured nor supported by Electrosem as of
If you currently have a Pensar unit and have
questions, concerns or need service, feel free to reach
out to us as we
have been servicing Pensar systems since 1981 and we are still here for you
Service call in the metro Phoenix area is $89 and includes 30
Trip charges apply over ten miles.
you have moved into a house with a controller already on it and do not
understand how they function,
we can obtain a manual for your Pensar
unit and offer consultation, orientation and show you how to
make the most of it. Load controllers are a benefit when set up
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