Demonstration
Compare two fictional battery systems.
Use this comparison to see how product specifications, practical requirements and total costs can affect your choice. The two fictional battery systems show what to compare — from usable energy and power output to delivery, installation and support. The aim is to help you understand the trade-offs and prepare informed questions for suppliers and qualified installers.
| Question | Example A: smaller storage | Example B: greater energy and output |
|---|---|---|
| Fictional model | DEMO-BAT-01 | DEMO-BAT-02 |
| Nominal battery energy | 5 kWh | 10 kWh |
| Assumed usable battery energy | 4.5 kWh | 9 kWh |
| Nominal battery voltage | 51.2 V DC | 51.2 V DC |
| Assumed compatible inverter continuous output | 3 kW | 5 kW |
| Assumed inverter surge (5 seconds) | 5 kW | 8 kW |
| Fictional enclosure dimensions (H × W × D) | 500 × 450 × 180 mm | 720 × 500 × 250 mm |
| Fictional battery mass | 50 kg | 95 kg |
| Assumed 600 W load runtime at 90% conversion | 6.75 hours | 13.5 hours |
What the comparison teaches
Both examples assume a matched inverter, battery, compatible controls, protected enclosure and qualified installation; they do not establish a real compatible package. Example B has twice the assumed usable energy and higher assumed output, but a greater cost, size and mass. Example A may illustrate a smaller load budget; neither is a recommendation.
Runtime arithmetic: usable kWh ×0.90 ÷0.6 kW. It assumes a constant 600 W load and 90% conversion efficiency. Idle demand, temperature, ageing, reserve settings and starting surges are excluded. Battery energy alone does not establish output or backup capability.
Included for the example: battery, assumed compatible inverter and basic controls. Excluded: switchboard upgrades, site works, long cable runs, backup/isolation hardware, permits and remote travel. No physical product is supplied.
Illustrative complete-cost comparison
| Illustrative cost item | Example A | Example B |
|---|---|---|
| Equipment and assumed compatible inverter | AUD 4000 | AUD 6000 |
| Freight allowance | AUD 600 | AUD 800 |
| Illustrative taxes/charges allowance | AUD 400 | AUD 600 |
| Installation allowance | AUD 1600 | AUD 2000 |
| Commissioning allowance | AUD 200 | AUD 300 |
| Illustrative total | AUD 6,800 | AUD 9,700 |
All numbers are invented teaching allowances. Installation and commissioning are included as separate lines. The taxes/charges line is not a GST or import-tax calculation. Real tax, freight, installation, fees, optional services and exclusions remain unknown and must be set out in an accepted future offer. Do not add tax to these fictional totals or treat them as RRE prices.
What real documents and support would still be needed
Evidence status: not verified. No genuine certificate, datasheet or approval document is supplied. Inspect exact model/variant, document issuer/version/dates, scope and unresolved gaps. Supplier-business acceptance and product acceptance are separate.
Delivery quotation: unavailable. No actual delivery date, warranty term, supplier commitment or support arrangement is offered. Obtain written inclusion, delivery, installation, warranty and escalation responsibilities before a future purchase.
Your next step during the preview
Prepare a brief you can keep on your own device. A qualified installer should assess the exact model, site, electrical arrangements and compatibility before any future purchase.