©2000 Xantrex Technology Inc.
Diversion Load Types
Several different types of diversion loads are available to the alternative
energy market. These loads are designed to operate with the power output
levels common to most diversion load controllers. The following are several
available diversion loads which may be used successfully for heating water
or air.
A 120 VAC, 2000-watt water heater element, available at most hardware
stores, may be used with a 12-, 24-, or 48-volt DC system; however do not
expect a 2000-watt power dissipation. The power draw is determined by the
heater elements DC resistance, the output voltage of the controller, as well as
the output current capability of the charging source(s). These heater elements
were designed to operate at 120 volts AC. A 48-volt, 40-amp charge controller
will operate just fine with this type of a system providing about 500 watts of
power dissipation. A 12- or 24-volt diversion load controller will work but
doesnt put out enough power to effectively heat water with only one element.
The remedy to this type of problem is to parallel several of these heater
elements to increase the power output.
Table 10 below shows power dissipation of a 120 VAC, 2000-watt heater
element operated at different voltages. Note that the voltages given are roughly
the bulk charge stage voltages for a given system. Remember that if you
parallel heater elements, the diversion load can handle more current.
e
g
a
t
l
o
V
m
e
t
s
y
S
r
e
w
o
P
e
g
a
r
e
p
m
A
)
m
e
t
s
y
s
C
D
V
8
4
(
C
D
V
0
6
W
0
0
5
s
p
m
a
3
.
8
)
m
e
t
s
y
s
C
D
V
4
2
(
C
D
V
0
3
W
5
2
1
s
p
m
a
2
.
4
)
m
e
t
s
y
s
C
D
V
2
1
(
C
D
V
5
1
W
1
3
s
p
m
a
1
.
2
C
A
V
0
2
1
W
0
0
0
2
s
p
m
a
7
.
6
1
Table 10
Power Dissipation
A couple of other excellent diversion loads which may be utilized
effectively are available from Alternative Energy Engineering (AEE) of
Redway, California.
1.
A 12/24 volt DC or 24/48 volt DC water heater element (AEE Part #20909
or #20919 (24/48 V)).
2.
Open air heater with a fan (AEE Part #2091312 -12 V, 720 W), #2091324
(24 V - 720 W), #20 91412 (12 V - 1440 W), #2091524 (24 V - 1440 W),
and #2091648 (48 V -1440 W)).
For more information call AEE at:
1(800) 800-0624, or 1(800) 777-6609, or FAX 1 (800) 777-6648.
7.0 DIVERSION LOADS
44
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