When it comes to power inverters there are two different types to consider – Pure Sine Wave or Modified Sine Wave.
The difference between the two can be a little confusing, but it is important in understanding it in order to get the best power inverter for your needs.
Both modified and pure sine wave can be used in most off-grid power situations at home, in a car, truck, van, boat, or with solar panels.
When deciding between your preferred sine wave it’s key to know what types of devices you plan to run from the inverter.
With this in mind, let’s jump in!
Pure Sine Wave vs Modified Sine Wave
The main job of a power inverter is to convert Direct Current (DC) created by a battery into Alternating Current (AC) which you need to run home appliances and electronics. Alternating current is the type of electricity you get from mains power at home.
Essentially this means the current from a constant DC voltage is changed into something called a Sine Wave which varies in the flow of voltage. The Sine Wave output by the conversion is where we can get different variations.
Pure Sine Wave – This is a smooth flow of voltage in a nice wave. You can run even the most sensitive of devices with pure sine wave thanks to the smooth flow of current which leaves no drop or aggressive change in current.
Modified Sine Wave – This is a blocky change in voltage that ends up with power fluctuations similar to a step pattern. The blocky nature of modified sine wave means that current flow can be jumpy and unreliable which is not good for sensitive electronics that need a smooth flow.
Benefits of Pure Sine Wave
Pure sine wave inverters have the best overall performance enabling you to power a wider range of modern technology, including the most sensitive of devices. They are essential if you plan to run electronics needing a constant smooth flow of current such as LED TVs, high-end computers, medical equipment, laser printers, timers & clocks, digital radios, microwaves, plus anything motorized like power tools or blenders.
Adding to this it also has other big benefits such as:
- Quieter operation
- More efficient output
- No damage to devices
- Appliances last longer
- No buzzing or humming
I’ve also written an in-depth look at the pros and cons of a pure sine wave inverter for more information on this subject.
Benefits of Modified Sine Wave
So why would you go for a modified sine wave inverter I hear you ask?
Well, the big reason is price! If you don’t need to run anything sensitive and just need to power simple devices or charge items like phones, tablets, batteries, or lighting then you’ll be fine with modified. You’ll be able to get low-powered options for as little as $30 which is great if you just want something for your car or camping.
Modified sine wave inverters are also less efficient, especially when powering motors which will run 30% hotter and wear out quicker. Adding to this, the higher total harmonic distortion leads to a buzz or humming sound which can get annoying over time (or immediately if you’re easily annoyed!)
Which is the Best Sine Wave for Me?
If you’re still not sure which to choose then ask yourself some simple questions to help decide:
- Does my appliance use a motor? (e.g. power tool or blender)
- Is my device medical equipment? (e.g. CPAP)
- Does my device need a smooth constant flow of power? (e.g. LED TV or computer)
