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Annual yield is only the opening number. This model follows each representative hour into on-site use, DEBS export or curtailment, then retains the tariff, export envelope and financial assumptions behind the result.
Declared site assumptions
Export envelope
Western Power's static base limit where no retailer off-take agreement applies.
Year-one value
$962
Avoided imports plus DEBS exports
25-year net present value
$5,440
After $8,000 installed cost
Discounted payback
Year 12
5% discount rate
Self-consumed
20.5%
2,420 kWh
Exported
38.7%
4,572 kWh
Curtailed
40.9%
4,831 kWh not used or exported
Average day across the source period
Avoided import
$805
Self-use x A1 tariff
Export payment
$157
Export x DEBS period
Foregone export value
$129
Reference only
Constraint sensitivity
Same system, load and tariff. Only the modelled export envelope moves. The no-cap row is a counterfactual, not an approval.
0 kW
Scenario
$805
79.5% cut
1.5 kW
Source
$962
40.9% cut
3 kW
Source
$1,050
15.4% cut
5 kW
Source
$1,089
0.8% cut
No cap
Counterfactual
$1,091
0.0% cut
Assumption ledger
Retain the calculation
The public files retain the source edition, method version and default interval ledger. Research access extends this to measured interval data, exact tariff matching and portfolio comparisons.
The model scales a five-year NASA POWER month-hour solar shape to Solar Analytica's Perth TOPCon specific-yield baseline. It then allocates every generated kilowatt-hour against a declared household load shape and export envelope.
It does not infer roof orientation, shading, inverter clipping, measured household interval data, connection approval, tariff eligibility or future tariff escalation. Those are either editable assumptions or deliberately outside this first release.
The A1 daily supply charge is retained in the tariff edition but excluded from solar savings because installing solar does not remove the grid connection charge.
WA tariff, DEBS periods, Western Power limits and NASA POWER solar shape.
Site consumption, load shape, installed cost, degradation and discount rate.
Method version, source edition and 8,760-row default ledger in JSON and CSV.
Research access replaces representative load with measured intervals, maps the exact tariff and retains comparable scenarios across a site or portfolio.