Home / New Zealand guides / Professional electrical design / Transfer and islanded operation: Compact apartment
New Zealand planning guidance for a specific property and load boundary. Keep shared protection and apartment protection distinct. H2OME remains in early development.
A backup supply must interact safely with the network and the property wiring. Transfer, isolation and islanded operation are design matters for the relevant professionals and distributor. Ask how the equipment prevents unintended energisation and how each operating state is verified.
No transfer-time, UPS or seamless-switching claim is assumed for H2OME. Sensitive appliances need compatibility evidence, and a powered property must not create hazards for network workers. Do not attempt backfeeding or improvised interconnection.
Cooking appliances, tumble drying and communal services are outside this illustrative essential load set.
Shared walls, common switchboards and building rules matter as much as the demand inside the flat. A resident does not control the lift, communal pump or fire systems simply because they can list their own appliances.
For a compact apartment, request transfer evidence for the selected appliances rather than a demonstration at 0.13 kW assumed base demand alone. The separate recording device may have different interruption tolerances, so its provider requirements belong in the acceptance scope.
Keep shared protection and apartment protection distinct. An apartment may be unsuitable for on-site hydrogen equipment. Do not infer suitability from low electricity demand; building permissions, safe separation and professional assessment come first.
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 compact apartment, assume the selected base loads average 0.13 kW for 6 hours: 0.13 × 6 = 0.78 kWh. Separately, an additional sensitive recording device draws an assumed 35 W for 2 hours: (35 ÷ 1,000) × 2 = 0.07 kWh. The combined illustrative demand is 0.85 kWh.
Its energy demand does not establish whether a transfer interruption or power-quality change is acceptable.
For arithmetic only, if the complete storage chain had a hypothetical 30% round-trip efficiency, delivering 0.85 kWh would require 0.85 ÷ 0.30 = 2.8333 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: 6 hours. Extra illustrative load: An additional sensitive recording device, 35 W for 2 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.
Shared walls, common switchboards and building rules matter as much as the demand inside the flat. A resident does not control the lift, communal pump or fire systems simply because they can list their own appliances. Keep shared protection and apartment protection distinct.
No. The 0.85 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. 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.