The Complete Buyers Guide To Caravan Inverters

An inverter converts the 12V DC power stored in your caravan batteries into 240V AC power, the same as a household power point. This lets you run appliances like laptops, coffee machines, hair dryers, power tools, and blenders without being plugged into mains power. For some Big Lappers, an inverter is the difference between a functional mobile office and a glorified tent.

The catch: inverters consume battery power rapidly. Running a 1,000W appliance for an hour draws roughly 85Ah from your 12V battery. If you haven’t sized your battery bank to support your inverter use, you’ll flatten your batteries before lunch. This guide covers how inverters work, how to size one correctly, and which ones are worth buying.

How Inverters Work (And Why Size Matters)

Your caravan’s 12V system and your household appliances speak different electrical languages. The battery stores DC (direct current) at 12 volts. Household appliances need AC (alternating current) at 240 volts. The inverter translates between them.

The conversion isn’t free. Inverters lose roughly 10 to 15% of energy in the conversion process (as heat). So a 1,000W appliance actually draws around 1,100 to 1,150W from your batteries. This matters when calculating how long your batteries will last under inverter load.

Sizing rule of thumb: Your inverter’s continuous power rating should be at least 20% higher than the maximum wattage of the appliance you want to run. A 1,000W coffee machine needs at least a 1,200W inverter. A 1,500W hair dryer needs at least a 1,800W inverter. Some appliances (particularly those with motors, like blenders and power tools) have startup surges that can be two to three times their rated wattage, so check the inverter’s peak/surge rating as well.

Pure Sine Wave vs Modified Sine Wave

Pure sine wave inverters produce a smooth electrical waveform identical to mains power. All appliances work correctly, electronics are protected, and motors run quietly and efficiently. These are more expensive but are the only type you should consider for a caravan.

Modified sine wave inverters produce a stepped approximation of a sine wave. They’re cheaper but can cause problems with sensitive electronics (laptops, chargers, TVs), make motors run hotter and louder, and can damage some appliances over time. The small price saving isn’t worth the risk. Avoid them.

Inverter Sizes: What Do You Actually Need?

Small (300 to 600W): $100 to $250. Handles laptop charging, phone charging via standard chargers, LED TV, small fans, and basic electronics. Ideal if you just want to charge devices without a 240V power point. Draws modestly from your batteries. Good for caravanners who don’t need to run large appliances off-grid.

Medium (1,000 to 1,500W): $300 to $700. Handles everything above plus a coffee machine (briefly), blender, small power tools, hair straightener, and slow cooker. This is the sweet spot for most Big Lappers. It covers the common “nice to have” appliances without requiring an enormous battery bank. A 1,200W inverter running a coffee machine for 5 minutes uses roughly 8Ah, which is manageable for most systems.

Large (2,000 to 3,000W): $700 to $1,500. Handles everything above plus a microwave, hair dryer, air conditioner (some models), induction cooktop, and heavy power tools. The battery draw is substantial: running a 2,000W appliance for 30 minutes draws around 85Ah. You need a large lithium battery bank (300Ah+) and substantial solar to sustain this kind of use. Only worthwhile if your power system is built to support it.

Product Recommendations

Victron Phoenix 1200VA (1,000W continuous)

A premium pure sine wave inverter from one of the most respected brands in off-grid power. Excellent build quality, very low idle consumption (8W), and high efficiency (93%). The Victron integrates with the Victron ecosystem (SmartShunt, solar controllers, GX devices) for comprehensive monitoring and control via the Victron Connect app. Around $500 to $650. This is the inverter most 12V specialists recommend for quality caravan installations.

Enerdrive ePOWER 2000W

A popular choice for Big Lappers who want to run larger appliances. 2,000W continuous with a 4,000W surge rating handles coffee machines, microwaves, and even some air conditioners. Pure sine wave, good efficiency, and an Australian brand with solid support. Around $800 to $1,100. Pairs well with Enerdrive batteries and chargers.

Redarc 1000W Pure Sine Wave

Redarc’s inverter offering is compact, efficient, and well-built. 1,000W continuous with a 2,000W surge. Integrates with Redarc’s RedVision monitoring system. A good mid-range choice, particularly for Redarc-based power systems. Around $450 to $600.

Giandel 1000W Pure Sine Wave

A budget-friendly pure sine wave inverter that punches above its price. 1,000W continuous with a 2,000W surge. It doesn’t have the brand pedigree of Victron or Enerdrive, but reviews from the caravan community are consistently positive. Includes a remote on/off switch, which is useful when the inverter is mounted in an awkward location. Around $200 to $300. The best value option if budget is a priority.

Installation Considerations

Location: Mount your inverter as close to the batteries as possible. Longer cable runs between battery and inverter create voltage drop and energy loss. The inverter needs ventilation; it generates heat under load and must not be enclosed in a sealed compartment.

Wiring: Inverters draw high current from the 12V battery. A 2,000W inverter running at full load pulls roughly 170 amps at 12V, which requires thick cable (50mm² or larger for short runs) and quality terminations. Undersized wiring is a fire risk. This is one area where professional installation is worth the cost if you’re not confident with high-current 12V wiring.

Fusing: An appropriately rated fuse or circuit breaker between the battery and inverter is mandatory. This protects against short circuits and wiring faults.

Remote switch: An inverter uses a small amount of power even when nothing is plugged in (idle draw, typically 5 to 15W). A remote on/off switch lets you turn the inverter off when not in use, saving that standby power. Some inverters include a remote switch; for those that don’t, it’s a worthwhile addition.