Document ID: chunk:federal_register_of_legislation:F2022C00033:reg:9:p1
Version: federal_register_of_legislation:F2022C00033
Segment Type: reg
Provision Reference: reg 9 (pt 1/4)
Character Range: 14186–16822

9                  2030                                 0.1

7. The number worked out under step 6 or 6A (as applicable) is the number of STCs that may be created for the small SWH or ASHP in the relevant zone.

Division C – Special Circumstances

The input parameters and control strategies used to calculate the total annual auxiliary energy for step 2 in the method in Division B of this Part are subject to modification in the following circumstances.
    1. Tanks with bottom element or capable of having a bottom element fitted
For systems where a bottom element is, or can be, fitted in the tank (e.g. a dual element tank), the bottom element is to be used in this method. The minimum boost time for a bottom element shall be nominal off-peak times of 11 pm to 6 am.
Some tank designs may be modified by the installer to insert an element at the bottom of the tank even if this element has been blanked off.  If a small SWH or ASHP uses a tank that can have the bottom element connected at the time of installation or at any later time, the bottom element is to be used for rating purposes.
    2. One-shot boosting
One-shot boosting is a manual control that allows a default boost mode (such as off-peak boosting) to be overridden so that the user can satisfy a short term high demand for hot water.
Where the system automatically resets to the default boosting mode within 24 hours of the user changing the boost mode, the one-shot boosting can be ignored.
Where the system does not automatically reset to the default boosting mode within 24 hours of the user changing the boost mode, the boosting mode activated by the manual control must be taken to be active at all times.
    3. SWHs with hybrid photovoltaic/thermal solar collectors
For a small SWH or ASHP that utilises one or more photovoltaic/thermal (PV/T) hybrid solar collectors, which generate both electricity and useable thermal energy from the same collector, the following testing regime must be documented.

    (a)  PV output

    The PV output shall be assessed using a collector with the water heating part of the collector empty.

(b)  Water heating output

    The thermal efficiency of the collector shall be assessed in accordance with AS/NZS 2535:2007 with the PV output set to maximum power conditions. The electrical output of the collector shall not be included in the thermal efficiency assessment.
Note:  A small SWH or ASHP with PV/T collectors will only be eligible for STCs as a SWH in relation to the water heating component of the system.

Part 2 – Method for solar water heaters with a volumetric capacity more than 700 litres

Division A –