ET2000e IRRIGATION CONTROLLER INSTALLATION
®
making
since 1986
ater work
Electrical power consumption
This is a table of power consumption values for
Calsense Irrigation controllers and their options.
Among other uses, the table may be used when
designing solar power systems used to provide
power to the irrigation controller.
Power Consumption
Controller / Option
Watts
ET2000 5.2
ET2000e 5.2
-RR 0.2
-RRe 1.5
-R 0.5
(1)
-EN 2.8
-WEN XXX
-FOM 4.4
-LR 2.1
(2)
-GR 1.5
-SR 1.2
Single Field
Valve
7.0
(3)
Dayton Relay
5X823E
0.2
(1) For the -R option on ET2000 controllers use
1.0 W, for ET2000e use the table value.
(2) For the -LR option on ET2000 Controllers
use 3.4 W, for ET2000e use the table value.
(3) This value is considered typical for an
irrigation valve. The actual valves in use may be
more or less than this.
The power numbers were measured on the primary
120 VAC line using a “Watts up? PRO/ES” power
analyzer. The irrigation controller transformer losses
are included in the numbers as the power was
measured on the line side of the transformer. The
numbers should be viewed as steady state, 24 hour
per day.
You must add up the consumption values for the
options included on the irrigation controller you are
working with. If an option is not included in the list it
consumes such little power it may be ignored. For
example the Watt-Hours per day for an ET2000e-24-
LR-RRe would be calculated as follows:
(5.2W + 1.5W + 2.1W) x 24hr/day
=
212 Watt-Hours/day
The previous calculation does NOT take into
account any irrigation. The power used during
irrigation is dependent on the specifics of the site the
controller is irrigating, but is primarily dictated by the
type of and number of valves being used.
The following example is for a standard irrigation
valve. Assume we have a 24 station controller and
that each valve irrigates each day for 20 minutes.
Also assume we have a normally closed master
valve. The calculations would then be as follows:
(24 valves) x (20 min ÷ 60 min/hr) x (7 watt valve
+ 7 watt master valve) = 112 Watt-Hours/day
The preceding equation may be used as a guideline
when calculating the actual amount of power
consumed during irrigation. It should be adjusted to
reflect your specific application. As table note (3)
states the 7 watt valve figure is considered typical
for an average irrigation valve. Please confirm with
the valve manufacture the proper power
consumption for their solenoid.
Additional Notes:
1) The numbers in the table represent average
power consumption as if it didn’t fluctuate during
the course of the day. The table values do not
represent peak power. For the purposes of sizing
a solar power inverter however the peak values
may be important. It is safe to use 50W as the
maximum instantaneous power draw for any
combinations of options.
CHANGE 1 12 March 2007
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