120V to 230V RV Conversion: Who Needs It & What's Involved
By RV Solutions, Christchurch · approx. 8 min read
Planning to bring an American RV to New Zealand? One of the most important upgrades
you'll need is converting the electrical system from 120V to 230V. This guide explains who needs the
conversion, what's actually involved, roughly what it costs, and why it has to be done by a
registered professional to be safe and compliant.
Who Needs a 120V to 230V Conversion?
If you've bought or imported a motorhome, fifth wheel, travel trailer or caravan from North America,
you'll almost always need electrical conversion work before you can safely and legally use its mains
system in New Zealand.
American RVs Use a Different Electrical Standard
North American RVs are built for 110–120V AC at 60Hz — the standard across the USA,
Canada and Mexico. New Zealand (like Australia, the UK and most of Europe) uses 230V AC at
50Hz. This isn't a plug-adapter issue — it's a fundamental difference that affects the
whole 230V side of your RV's electrical system.
Step-Down Transformers Aren't a Real Fix
Some owners consider a 230V→120V step-down transformer as a cheaper workaround. It has real limits: transformers are heavy, take up space, struggle with high-power appliances like air conditioners, and leave your RV non-compliant — so it still won't pass an EWOF. Fine as a stop-gap for the odd appliance; not a substitute for proper conversion.
Common Situations That Need Conversion
Importing a used American motorhome or RV — bought from the US directly, or an imported RV already here that was never converted.
Relocating to New Zealand with your RV — bringing your American motorhome or fifth wheel with you.
Buying an American RV brand new — even new US RVs need conversion for NZ use.
Converting a specialty or work vehicle — commercial vehicles with living quarters imported from North America.
Why It Has to Be Done Professionally
In New Zealand, mains-voltage (230V) electrical work is legally restricted to authorised people
— in practice, a registered electrician — under the Electricity Act 1992 and its
regulations. This isn't optional, and it's what makes your system safe and insurable.
The Compliance Picture in NZ
The RV's 230V installation is covered by AS/NZS 3001.2:2022 ("Connectable electrical installations"), which is now cited in the Electricity (Safety) Amendment Regulations 2025 that came into force in November 2025. In short:
230V work must be carried out by a registered electrician
Running a 120V RV on NZ's 230V network without proper conversion can bite in several ways:
Insurance risk — many policies require electrical systems to meet local standards; a claim could be declined.
No EWOF — you can't get an Electrical Warrant of Fitness without compliant 230V work.
Safety hazards — risk of fire, shock and appliance damage.
Liability — if an electrical incident occurs, non-compliant wiring can create legal exposure.
Resale — unconverted RVs are harder to sell and worth less in the NZ market.
EWOF Is Not the Same as Self-Containment
These often get confused. An EWOF certifies your RV's 230V electrical system. Self-containment certification is a separate scheme covering water and waste. You may need both, but they're different tickets — converting your electrics gets you the EWOF, not self-containment.
What's Involved in the Conversion
A full 120V→230V conversion is a comprehensive job that touches nearly every part of the AC
system. Here's what's typically required.
1. Shore Power Inlet
Remove the American 120V inlet (usually a 30A or 50A twist-lock connector).
Fit an NZ-standard 230V inlet (commonly a blue 16A or 32A connector).
Replace the shore-power lead with appropriate NZ-rated cable.
Weatherproof and mount correctly.
2. Distribution Board & Protection
Remove the 120V breakers — American breakers aren't suited to 230V systems.
Fit an RCD — residual current device for shock protection.
Fit MCBs — correctly rated for 230V circuits.
Double-pole switching — NZ practice switches both live and neutral.
Correct earthing and bonding — essential for safety and compliance.
3. Internal Wiring
Cable assessment — confirm cabling suits 230V circuits (often around 1.5–2.5mm² for 16A).
Rewire where needed — if existing cable is undersized or doesn't meet NZ standards.
Proper routing and mechanical protection — to AS/NZS requirements.
Flexible cable suited to a mobile install — appropriate for vibration.
4. Power Outlets
Remove all American-style 120V outlets.
Fit NZ-standard 230V switched outlets.
Mount securely with sound connections.
5. Appliances
Often the most expensive part — most 120V appliances need replacing or significant modification:
Appliances That Usually Need Replacing
Microwave — almost always 120V-only.
Air conditioner — usually cheaper to replace with a 230V RV unit than convert.
Battery charger / converter — the 120V→12V charger must become a 230V→12V unit.
Electric water heater element — replace if electrically heated.
Induction cooktop — typically needs replacing if fitted.
Washing machine — needs a 230V model if equipped.
Electric heater elements — replace with 230V-rated parts.
6. Inverter / Charger
Many RVs have a combined inverter/charger handling both battery charging and 12V→120V inverting. These usually need attention:
Some can be reconfigured — higher-end units may accept both 120V and 230V input.
Most need replacing — older or basic units are 120V-specific.
A good upgrade opportunity — often the ideal time to fit a quality inverter/charger like Victron.
7. The 12V DC Side (No Conversion Needed)
Good news — the 12V DC side is unaffected:
Interior lighting works the same.
Water pumps and 12V accessories carry on normally.
Only the charging method changes, via the new 230V→12V charger.
Understanding the Costs
Cost varies a lot with the RV's size, condition and appliances. The ranges below are indicative
guidance only — we'll give you a firm quote after assessing your vehicle:
Component
Indicative Range (NZD)
Shore power inlet & cable
$200 – $500
Distribution board (RCD/MCB)
$500 – $1,200
Outlet replacement (per outlet)
$80 – $150
Battery charger / converter
$600 – $2,500
Microwave replacement
$400 – $1,000
Air conditioner replacement
$1,500 – $4,000
Labour
$1,500 – $5,000+
EWOF certification
$300 – $600
Typical total
$5,000 – $15,000+
Budget for This When Importing
Factor conversion into your total budget before you buy. A great-looking US deal can lose its shine once conversion, shipping and compliance are added. Always get a conversion quote before committing to a purchase.
How Long It Takes
Assessment & quote — 1–2 hours to inspect and price.
Parts ordering — 1–3 weeks (some appliances may come from overseas).
Conversion work — 3–10 days depending on complexity.
Testing & certification — 1–2 days for thorough testing and EWOF.
Total — usually 3–6 weeks from first contact to completion.
Why You Can't DIY the 230V Work
Some owners with electrical experience are tempted to tackle this themselves. In New Zealand the 230V
portion isn't something you can legally do yourself:
Mains (230V) electrical work is restricted to registered electricians.
Unauthorised 230V work is unlawful and won't be covered by insurance.
You can't obtain an EWOF without a registered professional's sign-off.
230V systems carry serious shock and fire risk if wrongly installed — and RVs add vibration, moisture and tight spaces.
What You Can Help With
Removing old appliances (with guidance).
Researching and sourcing replacement appliances.
Providing access and preparing the workspace.
Cosmetic work once the electrical install is complete.
Choosing the Right Installer
Not every electrician does RV conversions. Look for:
Registered electrician — properly authorised for the work.
RV / caravan experience — familiar with mobile installs and AS/NZS 3001.2:2022.
EWOF capability — able to arrange or issue the Electrical Warrant of Fitness.
References & examples — previous conversion work.
Clear quoting — a transparent breakdown of scope and cost.
Good parts supply — access to quality RV-specific components.
After Conversion: Staying Compliant
EWOF renewal — an EWOF is generally valid up to 4 years.
Regular checks — visual inspection of outlets, cables and connections.
RCD testing — press the test button periodically to confirm it trips.
Professional servicing — get the system checked if anything seems off.
Keep your paperwork — retain certification for insurance and resale.
Alternative: Buy an Already-230V RV
If conversion feels daunting or costly, consider:
An already-converted American RV in NZ — confirm it was done professionally with a valid EWOF.
A European or Australian RV — 230V from the factory (though may still need an EWOF for NZ).
A New Zealand-built motorhome — designed for local conditions from the start.
Always ask for documentation of electrical work and current EWOF when buying any used RV.
Need a 120V to 230V Conversion?
RV Solutions converts American RVs to New Zealand electrical standards at our Christchurch workshop, with EWOF certification. Tell us about your vehicle and we'll give you an honest assessment and quote.
This article is general information to help you plan, not specific electrical or legal advice for
your vehicle. Standards, costs and compliance obligations change and vary by installation —
always have 230V conversion work designed, carried out and certified by a registered professional.
