Battery/inverter power for small 115v machines/tools?

[catalytic]

Many of my machine tools are in storage for the next 15 months or so until I finish moving, including my milling machines, grinders, saws, etc.

I would really love a battery-powered way to run at least the small ones (1/3hp, 7amps 115v) for just ~7 minutes or so. This would be enough time to knock out a couple small things on one of my small milling machines that have been holding up restorations and other projects.

Let's assume there's very little starting load. Is there a reasonable setup that can power a 1/3hp 7amps 115v motor for just a few minutes from something like a car battery? I don't want to hurt my motors, if that's a concern. It's indoors, so a generator also won't work.

 

[infinkc]

lets say you get a battery with 90amp hours.

an inverter will draw more wattage from the battery than what the device is rated for (100 watts will draw probably around 150w from the batt)

7 amps @ 115 = 805w, so say 900 watts

You will need at least a 1000w inverter for this.

This will use about 90 amps/hr

So if you had a fully charged 90ah battery it should last you 1 hour till its completely dead.

 

[nadogail]

An alternator coupled to either a motor or small engine will improve your prospects. Look at Epicenter dot com for ideas.

 

[Northislander]

Milwaukee MX Power supply largest load I've had on mine was a Milwaukee coring machine cored a 10" hole thru concrete no problem.

 

[a_whale]

<deleted>

 

[catalytic]

Thanks for the replies.

From what I'm reading, I need a "true sine wave" inverter to avoid harm to my machine motors---does this sound right? Can a true sine inverter still hurt/overheat my motors? Also, any quality brands to look out for?

 

[WisJim]

My shop has been run on a"pure sine wave" inverter for 20 years with no problems. But it's a 4kw inverter and a top quality American made unit. Don't ignore the starting surge of your motors.

 

[theoldwizard1]

Thanks for the replies.

From what I'm reading, I need a "true sine wave" inverter to avoid harm to my machine motors---does this sound right? Can a true sine inverter still hurt/overheat my motors?

On the contrary, sine wave inverters will allow motors to run cooler than modified sine wave.

Also, any quality brands to look out for?

Many to choose from !

 

[Viper98912]

Going back to the generator, have you considered buying a small generator and simply running a really long extension cord outside? Are you sure 7 minutes is truly enough?

 

[RPH]

Look into jackery systems. I just bought the 1000 watt system for the property up north. They now have a larger system available. Bit pricey but the silence is golden. Main purpose for me is to charge batteries for tools, music, and keeping portable freezer going for ice. The 1kw will do all the above easily. Light weight, 22 pounds for inverter and 9 pounds per solar cell.
https://www.jackery.com/

 

[JJN]

Many of my machine tools are in storage for the next 15 months or so until I finish moving, including my milling machines, grinders, saws, etc.

I would really love a battery-powered way to run at least the small ones (1/3hp, 7amps 115v) for just ~7 minutes or so. This would be enough time to knock out a couple small things on one of my small milling machines that have been holding up restorations and other projects.

Let's assume there's very little starting load. Is there a reasonable setup that can power a 1/3hp 7amps 115v motor for just a few minutes from something like a car battery? I don't want to hurt my motors, if that's a concern. It's indoors, so a generator also won't work.

I bought a 1600/2000 watt inverter generator, very portable, a few years ago do to all the power outages in California. It could power the 25 cu ft fridge, 70 inch Sony, Dish DVR, computer and an led light lamp ALL at the same time. Although never the intention when originally purchased, the inv gen has also been used to power tools in different locations of my 5.5 acres.