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Summary of available output mode combinations
Output
Mode
OP1
Setting
OP2
Setting
Operation
ONLY O/P 1
Variable
n/a
Standard variable power load management using only output 1. GEM diverts
excess PV power that would have been exported to the heater connected to
output 1. This mode is only suitable for connection of "dumb" restive heating
loads such as a standard immersion heater.
Threshold
n/a
Threshold mode load management using only output 1. GEM will wait until the
exported excess PV power reaches the level programmed. Once the
programmed level is reached output 1 is turned on fully. This mode can be used
to connect any kind of appliance.
Tmr Only
n/a
Timer or Boost operation only. Output 1 will turn on during the programmed ON
timer cycles or if manual boost is operated. No automatic load management or
optimising is carried out.
ONLY O/P 2
n/a
Variable
Operation is the same as described above for output 1 but only output 2 is used.
n/a
Threshold
n/a
Tmr Only
1 THEN 2
Variable
Variable
Output 1 operates in variable power load management mode until the set
temperature is reached. Output 2 then operates in variable power mode.
Priority is given to output 1 and so if output 1 temperature falls below the set
point then available PV power is again diverted to o/p 1.
Variable
Threshold
Mixed mode operation. Output 1 operates in variable power load management
mode until the set temperature is reached. Output 2 then operates in Threshold
mode and will divert full power to the load once the programmed export
threshold is reached. Once threshold control mode has started on output 2,
output 1 will remain off even if the temperature falls below the output 1 set
point. However, if output 2 has been programmed to use temperature control
and the set point for output 2 is reached, then operation will resume on output
1.
Threshold
Variable
Mixed mode operation. Output 1 operates in threshold mode and will divert full
power to the load once the programmed export threshold is reached. If output 1
has been programmed to use temperature control and the set point is reached
then operation starts on output 2 in variable power load management mode.
Once variable control mode has started on output 2, output 1 will remain off
even if the temperature falls below the output 1 set point. However, if output 2
has been programmed to use temperature control and the set point for output 2
is reached, then operation will resume on output 1.
Threshold
Threshold
Output 1 operates in threshold mode and will divert full power to the load once
the programmed export threshold is reached. If output 1 has been programmed
to use temperature control and the set point is reached then output 2 then
operates in Threshold mode and will divert full power to the load once the
programmed export threshold is reached. If output 2 has been programmed to
use temperature control and the set point for output 2 is reached, then
operation will resume on output 1.
Apollo GEM
Installation Manual