Home / New Zealand guides / Essential household services / Medical electricity contingency: Family home
New Zealand planning guidance for a specific property and load boundary. Agree when cooking and laundry can wait. H2OME remains in early development.
Where medical equipment depends on electricity, the clinical contingency plan comes first. Ask the clinician and equipment provider about required supply quality, supported backup arrangements, alarms and when to move to another location. Do not infer a safe operating period from an appliance label or a household calculation.
H2OME is in early development and must not be relied on as a medical safety guarantee or a replacement for established backup and relocation arrangements. Keep registration with the electricity supplier current, and ensure the plan still works when local power and communications fail together.
Laundry, vehicle charging and bulk water heating should be considered separately rather than folded into an essential-load promise.
Several people can turn on appliances at once. The largest demand may occur when an outage ends and refrigeration, hot water and cooking all try to resume, rather than during the quiet overnight period.
For a family home, keep the 3.24 kWh worksheet explicitly nonclinical. Add no medical appliance to this calculation without its provider's supply requirements and clinician-led contingency; the property priorities cannot overrule that plan.
Agree when cooking and laundry can wait. A whole-home connection is not proof that every appliance can operate together. The family needs a priority schedule that remains understandable without a phone app.
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 family home, assume the selected base loads average 0.25 kW for 12 hours: 0.25 × 12 = 3 kWh. Separately, a separate nonmedical contact and lighting point draws an assumed 20 W for 12 hours: (20 ÷ 1,000) × 12 = 0.24 kWh. The combined illustrative demand is 3.24 kWh.
This calculation deliberately excludes medical equipment; it cannot establish clinical safety or a medical operating duration.
For arithmetic only, if the complete storage chain had a hypothetical 30% round-trip efficiency, delivering 3.24 kWh would require 3.24 ÷ 0.30 = 10.8 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: 12 hours. Extra illustrative load: A separate nonmedical contact and lighting point, 20 W for 12 hours. Replace every input with a measured or professionally established value.
In New Zealand, discuss supply arrangements and connection questions with your electricity retailer and distributor. Ask the local council about relevant siting, building and water-use requirements. Use appropriately qualified electrical and hydrogen professionals, and refer workplace safety questions to WorkSafe guidance. This page does not establish a consent or compliance outcome.
For medically dependent people in New Zealand, register with your electricity retailer, the company that bills you, and keep that registration current. Re-register when switching retailers; ask the retailer how the distributor is informed and what clinical confirmation is needed. Follow the clinician and equipment provider's contingency plan. Registration does not guarantee uninterrupted electricity, and H2OME is not a substitute for that plan.
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.
Several people can turn on appliances at once. The largest demand may occur when an outage ends and refrigeration, hot water and cooking all try to resume, rather than during the quiet overnight period. Agree when cooking and laundry can wait.
No. The 3.24 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 New Zealand, discuss supply arrangements and connection questions with your electricity retailer and distributor. Ask the local council about relevant siting, building and water-use requirements. Use appropriately qualified electrical and hydrogen professionals, and refer workplace safety questions to WorkSafe guidance. This page does not establish a consent or compliance outcome. For medically dependent people in New Zealand, register with your electricity retailer, the company that bills you, and keep that registration current. Re-register when switching retailers; ask the retailer how the distributor is informed and what clinical confirmation is needed. Follow the clinician and equipment provider's contingency plan. Registration does not guarantee uninterrupted electricity, and H2OME is not a substitute for that plan.
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.