PowerSpout
TRG installation 2018
Last revised July 2018
© 2018 EcoInnovation Ltd (NZ)
Page 33
The Midnite Classic and Kid have a "hyperVoc" feature that makes them less vulnerable, but
other devices
will be damaged
if the peak turbine voltage exceeds their Voc limit.
If the Voc is too high then you must pack the magnetic rotor with washers to reduce the
voltage as follows:
Packing the rotor (only if required):
Remove the fairing and magnetic rotor (holding central knob while turning the magnetic rotor
clockwise). Add washers and refit the magnetic rotor. Use trial and error. Each packing
washer is 1.75mm thick and it will reduce the voltage by about 5-10%. If you have been
supplied with a red painted washer then put this on first. It will fit over the protruding thread
at the base of the spline. Never over-tighten the rotor knob. Keep a written record of the
washers used, and the voltage measured.
Pre-charge the bearing block with grease:
Remove the back cover and magnetic rotor
(holding central knob while turning the magnetic rotor clockwise). Open the valves and run
the turbine while greasing for the first time. Pump grease until you just see it emerging from
the bearing dust seal. See section 2.1.10 for details.
Check all connections are tight, the baseplate is earthed, wiring is well clear of rotor, and
then fit magnetic rotor (with the extractor knob inserted first). The knob should be finger tight
only. Run the turbine slowly and check for unexpected noises.
Having made sure
that the Voc will do no damage, close the circuit breaker to connect your
MPPT or GTI with the turbine running. You should soon hear the turbine slow down as it
comes on load.
Verify that your controller/inverter tracks to the expected voltage and power. (This test may
not work if the battery is already charged. If there is no diversion load in operation, use up
some power by discharging the battery by turning on a large load. The MPPT display should
read “Bulk”. If it reads “Float or “Absorb” then the turbine is not running under full load.)
For grid tied systems, inform the local Distribution Network Owner (DNO) within the time
allowed.
Manual adjustment of MPPT settings to optimise turbine speed
Some MPPT controllers allow you to manually set their input voltage settings. If the
controller is unable to automatically track the correct operating point this can be useful.
Adjust MPPT set point (turbine voltage) from highest to lowest voltage and note power
output at each setting. Then select best power result.
