What Size Inverter Do I Need for My Setup?

Choosing the right inverter is essential to ensure your solar or battery system runs smoothly and efficiently. An incorrectly sized inverter can lead to overloads, poor performance, or even damage to your appliances.

This guide will walk you through how to select the right inverter size based on your power needs.

⚡ What Does an Inverter Do?

An inverter converts DC (Direct Current) electricity from your battery or solar system into AC (Alternating Current) electricity — the same type used in standard household appliances.

If you're planning to run any 240V AC appliances from your off-grid or portable power setup, you’ll need an inverter.

? Step 1: List Your Appliances

Write down every appliance or device you plan to run simultaneously. For each item, note its wattage (W). You can usually find this on a label or in the product manual.

Total Load (if running at the same time): 60 + 90 + 40 + 1000 + 1200 = 2390W

? Step 2: Match to Inverter Size

Choose an inverter with a continuous power rating higher than your total appliance load.

• Continuous Rating: The max load your inverter can support continuously.

• Peak/Surge Rating: The short burst of higher wattage it can handle for a few seconds (for startup surges like fridges, pumps, or power tools).

? Example:

If your setup totals 2390W:

• Get at least a 2500W pure sine wave inverter (continuous rating)

• Ensure it has a surge capacity of at least 4000W for short peaks

⚙️ Step 3: Consider Pure Sine Wave vs Modified Sine Wave

• Pure Sine Wave Inverters – Safest for sensitive electronics, fridges, CPAP machines, power tools, etc.

• Modified Sine Wave Inverters – Cheaper, but may cause buzzing or overheating in some appliances.

We strongly recommend pure sine wave inverters for most off-grid and camping use.

? Bonus Tips

• Oversize slightly to give yourself buffer room.

• If you run high-demand items (e.g. air fryers, kettles, induction cookers), you’ll need a larger inverter and battery bank to match.

• Always check both wattage and voltage compatibility.