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.
Read the exact product documents
Identify the DEYE series, voltage class, phases, regional approval, compatible batteries and firmware. Peak efficiency, load-dependent efficiency and whole-system round-trip efficiency describe different tests. Compare like-for-like manufacturer conditions rather than treating a peak figure or an installer anecdote as measured annual household performance.
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.
Backup is a separate design
Ordinary grid-tied generation stops when the grid fails. Backup requires a supported operating mode, isolation from the grid, an approved earthing and protection arrangement, and defined circuits and loads. Check transfer behaviour and starting power against equipment requirements. A hybrid label or battery connection alone does not guarantee uninterrupted whole-home operation.
Protect configuration and remote access
Identify the account owner, installer permissions, network requirements and update process for the installed version. Back up approved settings before authorised changes. Do not bypass protective limits or load firmware from an unofficial source. Loss of an app connection is not necessarily loss of generation; confirm device status and measurements separately.
Separate product and workmanship terms
Obtain the exact regional product warranty and the contractor's written workmanship terms. Identify labour, travel, access, transport, registration, exclusions and claim responsibilities. Performance warranties are not promises about the household bill, and an insurance policy does not guarantee project completion. Agree milestones and changes in writing.
Keep a commissioning record
Agree the inspections, measurements, settings and documents applicable to the installation. Retain equipment identification, as-built diagrams, protection details, test results, operating instructions and handover records. Monitoring access is useful, but an app displaying generation is not proof of electrical safety, completed registration or an active export-compensation contract.
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.