Start with measured demand
Use interval electricity data and distinguish space heating, hot water, cooling, pool circulation and other loads. State occupancy and seasonal changes. A floor area, bedroom count or annual bill alone cannot establish the right inverter, battery or heat-pump size. Check supply capacity, phases, starting loads and simultaneous operation before specifying equipment.
Model generation at the property
Use a stated weather dataset, module plane, shading survey, temperature model and loss assumptions. Nameplate power is measured at defined test conditions, not a promise of continuous output. For example, twelve 500 Wp modules total 6 kWp at those conditions; that arithmetic alone says nothing about annual yield or the appropriate AC inverter size.
Read the surplus-compensation contract
Under simplified compensation, exported energy and imported energy are accounted for separately within the applicable billing arrangement; the credit is limited by the eligible imported-energy value. It does not automatically remove all fixed charges or taxes. A retailer's virtual-credit product has separate terms and is not a physical battery or a universal net-metering entitlement.
Size storage for a defined purpose
Separate usable energy in kWh from continuous and starting power in kW. Check reserve, efficiency, permitted discharge, temperature limits and exact inverter/firmware compatibility. A battery shifts energy with losses; it does not create free electricity. Compare a no-storage scenario before assigning any financial benefit to additional capacity.
Use condition-based maintenance
Review output against an appropriate weather- and season-adjusted baseline, not an arbitrary loss percentage. Investigate shading, soiling, faults and metering before assigning a cause. Cleaning benefit depends on actual soiling and rainfall; no universal production increase follows. Use manufacturer-permitted methods and safe access, with electrical inspection by qualified personnel.
Make financial assumptions explicit
Compare the actual installed quote with interval self-consumption, imports, exports, contracted prices and applicable credit limits. Include losses, fixed charges that remain, maintenance, replacement, finance and taxes. Treat incentives as conditional until their applicable requirements and, where required, award decisions are established. A simple cost divided by annual benefit is not a forecast or a guaranteed payback.
Documents and reference links
Check the current version and applicability. These links do not establish failure rates, LIT credentials or an outcome for your property.
Company contact
Ben HaydenPrepare for a useful assessment
Provide the location, objectives, existing models, plans or safely taken photos, and measured demand. Confirm scope, availability, assessment fees and responsibilities before booking.