Home / Australia guides / Hydrogen fundamentals / Round-trip conversion losses: Multigenerational home
Australia planning guidance for a specific property and load boundary. Discuss the system limits with every decision maker. H2OME remains in early development.
Round-trip efficiency compares usable electrical output with the electrical input needed to restore the same storage state. It is not the fuel-cell efficiency alone. For example, an explicitly hypothetical 30% round trip would require 10 kWh of input for 3 kWh of output, before any omitted loads.
That 30% example is arithmetic, not a verified H2OME result. Request test boundaries, operating conditions and auxiliary consumption. A cheap input period or surplus wind and micro-hydro can change an economic comparison, but cannot eliminate physical conversion losses.
Multiple hot-water cylinders, heaters and kitchen appliances need a staggered-use assessment rather than a blanket inclusion.
Different sleeping patterns, separate kitchenettes and mobility needs can extend the essential operating window. A single family representative may miss appliances used in another part of the house.
Use the 6.36 kWh demand for a multigenerational home as the numerator in the clearly hypothetical recovery example. Replace the assumed 0.30 only with a comparable measured whole-chain result, not a fuel-cell component efficiency.
Discuss the system limits with every decision maker. Accessibility and medical needs require their own contingency arrangements. An unproven energy system cannot be the sole basis for a care or evacuation decision.
All numbers below are hypothetical teaching inputs, not measured appliance specifications or product performance. The topic-specific extra load is separate from the base set; omit it if your real inventory already counts it. This worksheet does not include conversion overhead, protection design or a contingency allowance.
For a multigenerational home, assume the selected base loads average 0.36 kW for 16 hours: 0.36 × 16 = 5.76 kWh. Separately, an additional output-side appliance draws an assumed 300 W for 2 hours: (300 ÷ 1,000) × 2 = 0.6 kWh. The combined illustrative demand is 6.36 kWh.
At the hypothetical 30% round trip, divide this output energy by 0.30 to illustrate the larger input requirement.
For arithmetic only, if the complete storage chain had a hypothetical 30% round-trip efficiency, delivering 6.36 kWh would require 6.36 ÷ 0.30 = 21.2 kWh of charging input. This is not a measured H2OME efficiency or recovery result. Ongoing demand during charging would add to the required input.
Base operating window: 16 hours. Extra illustrative load: An additional output-side appliance, 300 W for 2 hours. Replace every input with a measured or professionally established value.
In Australia, check connection questions with your electricity retailer and distributor. Use electrical professionals holding the licence required in your state or territory, and ask the local council about relevant siting, building and water-use requirements. Energy Made Easy covers New South Wales, Queensland, South Australia, Tasmania and the Australian Capital Territory; outside those jurisdictions, check the relevant state or territory consumer energy comparison resource. Compare your actual tariff and charging window, not an assumed national rate. This guide does not claim to know a particular state's approval process.
For life support equipment in Australia, keep life support registration current with the electricity retailer or distributor as applicable and confirm how the other party is notified. Follow your clinician and equipment provider's contingency plan. Registration is not a guarantee of continuous electricity, and H2OME cannot replace an independent medical contingency.
H2OME is in early development. Its 10 kW output figure is a design target, not a proven specification. There is no confirmed price, certification, commercial availability or guaranteed runtime in this guide.
Hydrogen is an energy store, not free energy. Grid input, wind and micro-hydro are the charging options considered here. Each requires its own supply assessment. Do not install hydrogen equipment, modify fixed wiring, bypass protection or improvise a connection from this guide.
These official resources provide energy, consumer and technical background. They are not endorsements of H2OME, proof of its performance or a substitute for site-specific professional advice.
Different sleeping patterns, separate kitchenettes and mobility needs can extend the essential operating window. A single family representative may miss appliances used in another part of the house. Discuss the system limits with every decision maker.
No. The 6.36 kWh total is an illustrative demand worksheet, not a runtime result. Actual appliance measurements, usable storage output, starting demand, conversion overhead and reserve limits are needed. The 10 kW design target is not demonstrated output capability.
In Australia, check connection questions with your electricity retailer and distributor. Use electrical professionals holding the licence required in your state or territory, and ask the local council about relevant siting, building and water-use requirements. Energy Made Easy covers New South Wales, Queensland, South Australia, Tasmania and the Australian Capital Territory; outside those jurisdictions, check the relevant state or territory consumer energy comparison resource. Compare your actual tariff and charging window, not an assumed national rate. This guide does not claim to know a particular state's approval process. Use the worksheet to brief the relevant professionals, not to install, modify or operate hydrogen equipment.
Ask us about H2OME, tell us about your property or register your interest in the proposed system. We are in early development. No payment or purchase commitment; contacting us does not guarantee a pilot installation.