How to Calculate Inverter Size for Your Needs

CALCULATE THE INVERTER'S REQUIRED CAPACITY Recall, the total power consumed by your home (total wattage) – 460W. Therefore, required VA rating of inverter = (460/0.8) = 575VA . This is approximately a 0.6kVA (600VA).

When it comes to off-grid systems, choosing the right inverter size is crucial to ensure that your appliances function properly without damaging your batteries. The size of the inverter you need depends on the number and type of appliances you want to use, as well as the battery size.

For small items such as laptops, TVs, and lights, a small-sized inverter in the 300-600 watt range is often enough. However, many people wonder if they can run power-hungry items such as air conditioning, kettles, toasters, and coffee machines. The short answer is yes, but there are a few key considerations.

While you can run heavy users on a larger off-grid system, they require a substantial inverter, as well as batteries that can hold enough stored energy to power the appliances. In a caravan or camping situation, the battery storage is often limited to size and space, and the system is also 12-volt, which further limits the amount of current available to be drawn.

Large power users like a kettle can draw 200 amps over a short period of time. To do this safely without causing damage to your batteries, you need at least a 300-amp power bank. In general, the big power users are any appliances that heat or cool, and the best tip is to use gas wherever possible with these items.

A 12-volt 2500-watt inverter will run most pod coffee machines and microwaves, but we recommend at least a 12-volt 250-amp hour battery bank. Additionally, it is always best to have the batteries as close to full as possible before running power-heavy items.

If you need help working out what you need, feel free to give us a call and talk to one of our experts. Choosing the right inverter size is crucial to ensure that your off-grid system functions properly.


How do I know what size power inverter I need?
You can easily estimate the size inverter you'll need by adding up the largest number of watts you'll be using at a given time and adding 20%. For example, let's say you need 1,500 watts to run your computer and microwave at the same time. Take 1,500 + 300 (which is 20% of 1,500) = 1,800 watts.
What size should my inverter be?
As a general rule of thumb, the size of your inverter should be similar to the DC rating of your solar panel system, if you are installing a 6 kilowatt (kW) system, you can expect the proposed inverter to be around 6000 W, plus or minus a small percentage.
What can a 5000w inverter run?
Available 5000w.Can run the following continuously: 20 x LED(5w) = +-100w/hour. LED 42 inch TV +-80w/hour. DSTV +-50w/hour. Fridge +-350l 200w/hour. Alarm system +-50w. ... Can run the following 1 at a time: Electric gate +-300w. Microwave +- 1300w. Kettle +- 1500w. Toaster +- 1000w.= 6 – 8 Hours run time.
What can a 3000W inverter run?
Refrigerator: 350 - 780 watts.Microwave: 1500 - 2000 watts.Coffee machine: 800 - 1200 watts.Fluorescent light bulb: 25 watts.Incandescent light bulb: 100 watts.Cell phone: 50 watts.Laptop: 25 -150 watts.Ceiling fan: 75 - 120 watts.More items...•