120V to 230V RV Conversions for Motorhomes & Caravans
Convert your imported American motorhome or caravan to New Zealand's 230V electrical system with expert installation, compliance certification, and safe integration at our Christchurch workshop.
If you've imported a motorhome or caravan from the USA or another 120V country, converting your RV to 230V is essential for safe and compliant use in New Zealand. RV Solutions specialises in professional 120V to 230V RV electrical conversions, upgrading American motorhomes and caravans to meet NZ standards while ensuring reliable, safe operation on local shore power systems.
Professional Electrical Conversion Requirements
Changing a caravan from 120V (typically North American standard) to 230V (standard in NZ, Australia, UK, Europe) is a significant electrical project that requires professional, licensed work to ensure safety and compliance with local standards (such as AS/NZS 3001:2022 in NZ/Australia). The process involves replacing or reconfiguring all high-voltage components, updating the inlet, and ensuring proper circuit protection.
Professional Electrician Required
All 230V wiring and installation must be performed by a qualified electrician, as it is generally illegal for unauthorized persons to do this work.
Replacement of Appliances & Components
Almost all 120V-specific items must be replaced with 230V-rated components, including inlet, outlets, appliances, and converter/charger.
Rewiring and Protection
RCD/MCB panel replacement, proper cable sizing (1.5mm to 2.5mm²), and double-pole switching for both live and neutral conductors.
Compliance and Certification
Upon completion, the caravan requires an Electrical Warrant of Fitness (EWOF) to confirm compliance with local safety standards.
What's Involved in a 120V to 230V RV Conversion?
Every RV is different, but a typical conversion may include:
Shore Power System Upgrade
Replace the 120V inlet with a standard 230V inlet and update all external connections:
- Replace 120V inlet with 230V inlet (e.g., blue 16-amp plug)
- Install NZ-compliant shore power cable
- RCD and circuit protection upgrades
- Correct earthing and bonding
Distribution Board & Circuit Modifications
Replace 120V circuit breaker panel with 230V RCD/MCB system:
- Install Residual Current Device (RCD)
- Install Miniature Circuit Breakers (MCB)
- Rewire with 1.5mm to 2.5mm² 7-stranded flexible cable
- Install double-pole switching for live and neutral conductors
Outlets & Internal Wiring
Replace all wall sockets and internal wiring:
- Replace all 120V outlets with local 230V double-pole switched outlets
- Upgrade wiring to meet 230V circuit requirements
- Ensure proper cable sizing for 16-amp circuits
- Install appropriate protective devices
Appliance & Component Replacement
Replace or upgrade all 120V appliances and converters:
- Microwave, toaster, and small appliances
- Air conditioner (if AC powered)
- Fridge (if 230V-capable, may only need modification)
- Replace 120V to 12V converter/charger with 230V to 12V unit
Summary of Components to Replace
A complete 120V to 230V conversion typically involves replacement or modification of the following components:
- Exterior 120V inlet (shore power connection)
- Interior power points (outlets)
- Circuit breaker box/RCD
- Microwave, toaster, fridge (if AC powered)
- Air conditioner
- 12V charger/converter
- Shore power cable and connectors
- All internal 230V wiring (where required)
Want to Learn More About RV Conversions?
Read our comprehensive guide covering everything you need to know about converting American RVs to New Zealand standards, including costs, timelines, and what to expect.
Read the Complete Conversion Guide →Benefits of Professional 120V to 230V Conversion
Full NZ Compliance
Meet all New Zealand electrical standards and regulations for safe, legal RV operation.
Shore Power Connection
Connect safely to any NZ campground, holiday park, or home power supply without adapters or risks.
Insurance Coverage
Maintain valid insurance with a compliant, professionally converted electrical system.
EWOF Certification
Obtain Electrical Warrant of Fitness for self-contained certification and freedom camping access.
Professional Workmanship
Expert installation by qualified electricians using quality components and proper techniques.
Resale Value
Properly converted RVs are more attractive to buyers and command better prices in the NZ market.
Frequently Asked Questions
While step-down transformers (230V to 120V) might seem like a cheaper solution, they have significant limitations:
• They add weight, take up valuable space, and consume power even when appliances aren't running
• Most transformers can't handle high-power appliances like air conditioners or microwaves
• They don't address circuit protection, earthing, or compliance issues
• Your RV still won't pass EWOF certification or meet NZ electrical standards
A proper conversion is a permanent, safe solution that eliminates these concerns.
The timeframe depends on your RV's complexity and the extent of conversion required. A basic conversion might take 3-5 days, while more comprehensive work involving multiple appliance replacements and extensive rewiring could take 1-2 weeks.
We provide accurate timeframes after inspecting your RV and understanding your specific requirements.
Not necessarily. Some appliances are dual-voltage (120V/230V) and will work fine after conversion. Others can be adapted with new transformers or power supplies.
Items that typically need replacement include:
• Microwaves (usually 120V-only)
• Air conditioners (often more economical to replace than convert)
• Battery chargers and converters
• Some entertainment systems
We assess each appliance during inspection and recommend the most cost-effective approach.
It depends on the inverter model. Some American inverter/chargers can be reconfigured for 230V input, while others need replacement.
If replacement is needed, we install a quality pure sine wave inverter/charger suitable for New Zealand's 230V supply. This often provides an opportunity to upgrade to a more efficient system with better battery charging capabilities.
Good news—your 12V DC system (lights, water pump, fans, etc.) doesn't need conversion. These components run on battery power and work the same regardless of shore power voltage.
The conversion focuses on the 120V AC side of your electrical system, including shore power input, distribution, and 120V appliances.
Yes, assuming all work is completed to NZ electrical standards. We provide EWOF (Electrical Warrant of Fitness) certification as part of our conversion service.
This certification is required if you want your motorhome or caravan certified as self-contained for freedom camping in New Zealand.
Costs vary significantly depending on your RV's size, complexity, and the extent of work required. A basic conversion might start around $3,000-$5,000, while comprehensive conversions with multiple appliance replacements and extensive rewiring could be $8,000-$15,000 or more.
Factors affecting cost include:
• Number and type of appliances requiring replacement
• Extent of rewiring needed
• Inverter/charger upgrade requirements
• Distribution board modifications
• Access difficulty and RV layout
Contact us for a detailed quote based on your specific RV and requirements.
Yes, we work on all makes and models of imported RVs including American motorhomes, fifth wheels, travel trailers, and caravans from any 120V country.
We've completed conversions on everything from compact Class B vans to large Class A motorhomes, and can handle the unique challenges each presents.
Ready to Convert Your American RV?
Our Christchurch workshop specialises in professional 120V to 230V conversions for imported motorhomes and caravans. Get expert advice, quality workmanship, and full EWOF certification for safe, compliant RV operation in New Zealand.