Home / New Zealand guides / Professional electrical design / Single-phase and three-phase boundaries: Remote cabin
New Zealand planning guidance for a specific property and load boundary. Ask how protection works without reliable communications. H2OME remains in early development.
The phase arrangement influences which loads can be supported and how demand is distributed. A property may have three-phase machinery alongside single-phase household appliances. Supply type must be established from authorised service information and professional inspection, not guessed from appliance size.
A 10 kW design target does not establish phase capability, phase balancing or compatibility with a three-phase motor. Ask for the actual proposed equipment configuration and tested limitations. Treat large production loads as a separate engineering scope.
Electric space heating, water heating and cooking can dominate a small cabin energy budget and are excluded from this example.
Delivery, weather access and long periods without an occupant affect the decision. The smallest load set is not automatically the simplest system if nobody can respond to an alarm or inspect it.
In a remote cabin, locate the real circuits supporting small refrigerator, assumed average through professional assessment. The additional single-phase load cannot be divided across phases merely to make a worksheet fit; each phase and any multiphase equipment need their actual design limits.
Ask how protection works without reliable communications. A remote site needs a service and communications plan before it needs an autonomy claim. Unattended operation, frost exposure and access must be assessed using equipment-specific evidence.
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 remote cabin, assume the selected base loads average 0.1 kW for 24 hours: 0.1 × 24 = 2.4 kWh. Separately, an additional single-phase appliance draws an assumed 900 W for 1 hours: (900 ÷ 1,000) × 1 = 0.9 kWh. The combined illustrative demand is 3.3 kWh.
This total cannot be spread across phases by arithmetic unless the physical equipment and circuit design permit it.
For arithmetic only, if the complete storage chain had a hypothetical 30% round-trip efficiency, delivering 3.3 kWh would require 3.3 ÷ 0.30 = 11 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: 24 hours. Extra illustrative load: An additional single-phase appliance, 900 W for 1 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.
Delivery, weather access and long periods without an occupant affect the decision. The smallest load set is not automatically the simplest system if nobody can respond to an alarm or inspect it. Ask how protection works without reliable communications.
No. The 3.3 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.