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What Size Generator to Run Lincoln 225 Welder

A generator comes in handy in a lot of ways. You can use it in running almost anything that requires alternating and direct current. That includes a Lincoln 225 Welder, a stick welder known to require a higher amount of power. But, what size generator is ideal for running a Lincoln 225 Welder?

Lincoln 225 Welder requires 230-volts input and 50A of power. That means it requires 11.5kW to weld at 90 amps. And since it’s a transformer stick welder, the running watts is a third of the starting watts. That means you need a generator delivering 11.5kW running power and triple the running watts, 23kW minimum starting power.

Even though it sounds simple, there are other factors you need to consider when sizing a generator to run a Lincoln 225 Welder. Fortunately, this post gives you everything you need to purchase a perfect generator for the welder.

How to Size a Generator to Run Lincoln 225 Welder

Sizing a generator starts by determining the load power requirements to know how much the generator must provide. The same applies when sizing a unit to run Lincoln 225 Welder. You want to make sure you’re buying a model that can deliver enough power to run the welder and not overload. So, where do you start?

You start by determining the amount of power Lincoln 225 Welder needs

To determine the amount of power the Lincoln 225 Welder needs, you need to know its amperage and voltage. Typically, the information is printed on its front underneath the amp selection controller.

What you’re looking for here are the rated voltage and amps. The Lincoln 225 Welder required a 230-volt single-phase system and 50 amps. Convert this information to the rated wattage by multiplying them.

50 amps x 230 volts = 11,500 watts.

Convert it to kilowatts by dividing it by 1000.

1000 watts = 1 kW (kilowatt). So,

11,500 watts / 1000 watts = 11.5 kW

That means the Lincoln 225 Welder requires 11.5 kW of power to deliver enough welding power at 90 amps considering its efficiency is around 50%.

The starting watts required to start up the welder is double the running watts. That means the ideal size generator to run Lincoln 225 Welder must deliver 23kW surge power.

Keeping in mind that you have to factor in a 20% allowance for the generator to prevent the engine from overworking, the ideal generator for running a Lincoln 225 Welder would be a 15kW AC generator.

If you search the internet, you will see some success stories of some users using a small as a 5000-watt 230 VAC generator to run an AC Lincoln 225 Welder with a 1/8 inch diameter E6010 rode. However, the arc isn’t smooth, and most of them experience hard-to-strike moments or the electrode keep sticking.

It could work with a small project when working with amperage under 90 amps, but there might not be enough heat input for the welding. That will result in a low-quality weld with poor fusion and a poor bead appearance.

How to Choose a Generator to Run Lincoln 225 Welder

Now that you have sized your generator, you haven’t successfully picked a unit to run your Lincoln 225 Welder. You still need to narrow down your selection by considering the following factors.

1. Rated Output Voltage (volts)

The required output voltage of the generator will factor in when considering the type of generator to buy. You want to make sure your generator can provide 230 volts of power, which is the system required to run the welder.

2. Running amperage

The running amperage is essential because it allows an estimation of whether or not a generator can power the welder. Check the generator outlets to make sure there is at least one delivering 50 amps.

3. Fuel Type

Your fuel type is determined by how readily available it is and what cost per hour is associated with each type of fuel. Gasoline generators are generally less expensive, but they require regular upkeep, which increases running costs significantly. Natural gas or propane generators have higher initial costs but are more economical to run.

4. Sound Level

The noise level of the generator will be affected by the engine used in each specific model. If you plan to use your generator indoors, consider purchasing a generator with a sound enclosure to reduce noise levels and protect equipment from fumes that might come off the exhaust.

5. Portability

Where will you be using the Lincoln 225 Welder? At home, a job site or off-grid? Knowing where you plan to use the welder will help you determine if you need a portable generator or if a standby model will work just fine.

Even though the welder is pretty portable, a generator ideal for running it might not. A 15kW generator is a massive unit, even if it’s a mobile model. Luckily, today you can get a standby generator with wheels. However, it might be a bit expensive.

6. Runtime

How much time will be spent running the generator? If you plan on welding for extended periods, consider buying a model with an extended runtime feature.

7. Generator Type: Portable or Standby?

Portable generators are smaller and generally cost less money. However, it is not always possible to have them near the welding area. They may also be insufficient for a bigger welder or a higher wattage.

Standby generators should be chosen if the power supply is needed in a specific area where it is hard to bring a portable generator. The price of standby generators tend to be more expensive than that of portable ones, but they provide a constant power supply.

In the case of a welding application, a standby generator might be the best choice as it provides a constant power supply.

How to Safely Run Lincoln 225 Welder on a Generator?

The Lincoln 225 welder is a powerful machine capable of producing up to 200 amps at a 20% duty cycle for welding purposes. This machine will provide you with high-quality results but needs to be operated under certain conditions. Here are some tips to make sure you run it safely with a generator:

1. Avoid Overloading Generator

Be sure that your generator is capable of handling all the electrical loads from your 225 welders. When a generator does not have enough capacity, it will overload and stop or become unstable, damaging appliances or the power outlet itself.

2. Use Heavy Duty Cable

For safety reasons, don’t use an extension cord with a 225 welder. The welding current must flow through heavy-duty cable directly to avoid overheating due to resistance. Typically, the recommended is 10-G, but I would recommend a 6-G since you’re working with a 230-volt single-phase unit.

3. Run the Generator Outdoors

You must never run your generator indoors. When using a generator to run the welder, make sure you’ve placed it 5-feet away from all the windows, doors, and air vents to the house. This helps avoid carbon poisoning.

4. Prevent the generator and the 225 welder from getting wet

A small amount of water on the machine may not harm anything, but continuous rain might cause corrosion, affecting performance and creating sparks between electrodes.

What’s more, water increases the risk of getting shocked when dealing with electricity and lots of it when welding. Protect the generator and the welder from rain by always keeping the generator under a cover or canopy and the welder away from the rain.

5. Use a Dedicated breaker or outlet

Use a dedicated outlet to power the Lincoln 225 welder. If you hook the welder directly to the generator, make sure the outlet is compatible; it has to provide 230 volts, 50 amps at 60 Hz.

Never plug this machine into a shared outlet or circuit because it will overload the circuit and trip the breaker. When connecting the generator to the breaker, make sure you use a transfer switch or an interlock device. Avoid plugging it in to the sockets as that can back feed the power line causing injuries or even death.

6. Start and Shut Down the Generator Properly

Start the generator and allow the engine to run for some minutes before hooking up your Lincoln 225 welder and switching it on. Turn off the breaker when you are done welding, unhook it and then shut down the generator.

7. Read the User Manual

Make sure that you read the instructions manual before you understand all safety precautions required by the manufacturer of both the generator and the welder itself.

Read more about how to use a generator safely here.

Related Questions

What is a stick welder?

A stick welder is an electric welder that uses metal rods, often made of steel or stainless steel, and calcium silicate in the form of an electrode holder and coated with flux at one end. The different metals in the electrodes can produce various sized weld puddles for different thicknesses of material. It can create arcs between 1” to 12” away from the welding surface.

How many amps is a Lincoln 225 Welder?

Lincoln 225 Welder requires 50 amps AC input. Its AC amperage output ranges from 40 amps to 225 amps giving you a range of options depending on the task at hand and the size of your electrode.

About the author

Sharif Gen

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