power inverter for garage
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  1. #1
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    Sep 2013
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    west texas
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    power inverter for garage

    Since running a generator in a garage isn't a good idea I saw a new 24v forklift battery at the scrap yard the other day.
    Thank the air force and their disregard for spending tax payer dollars on stuff with out checking that it will work first.
    So now I have a little 255ah, 560lb warehouse tug battery in my garage.
    I think I will pair it with a 24v 2,000w samlex pure sine inverter.
    But need to come up with something to recharge the battery.
    All I have is a 24v 7 amp floor scrubber battery charger and my 120v transformer tig to charge it.
    That will run just about any 120v appliance for a while with out making any noise or poisonous carbon monoxide.
    I can get 3kwh out of it no problem and up to 6 kwh if I run it down till the inverter shuts off.
    old Miller spectrum 625
    Lincoln SP-135 T, CO2+0.025 wire
    Miller model 250 and WP-18V torch
    Craftsman 100amp AC/DC and WP-17V torch
    Century 115-004 HF arc stabilizer
    Home made 4 transformer spot welder
    Home made alternator welder

  2. #2
    Join Date
    Apr 2006
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    Outside of Raleigh, NC
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    565

    Re: power inverter for garage

    What about placing the generator outside the garage? Seems to me that you will spend more$ for fuel to run your vehicle to recharge the battery, versus powering your 7KW generator to run the welder.

    I’m not sure that a 7A charger will charge the forklift battery very quickly. What type of AC power do you have available in the garage?
    Last edited by scsmith42; 09-07-2018 at 06:51 AM.
    Miller Trailblazer Pro 350D
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  3. #3
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    west texas
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    Re: power inverter for garage

    The garage has numerous 120 and 240v circuits.
    The battery and power inverter are for backup power.

    To wire the power inverter it will need to handle 180 amps at 22 volts for a 4,000w start up loads and 83 amps at 24 volts for 2,000w of rated load.
    I will probably wire up the inverter with 2 gauge cable.
    It will easy handle 83 amps.

    Later on this battery will probably end up out in the well house for 24v well power.
    old Miller spectrum 625
    Lincoln SP-135 T, CO2+0.025 wire
    Miller model 250 and WP-18V torch
    Craftsman 100amp AC/DC and WP-17V torch
    Century 115-004 HF arc stabilizer
    Home made 4 transformer spot welder
    Home made alternator welder

  4. #4
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    Apr 2006
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    Outside of Raleigh, NC
    Posts
    565

    Re: power inverter for garage

    Quote Originally Posted by mad welder 4 View Post
    The garage has numerous 120 and 240v circuits.
    The battery and power inverter are for backup power.

    To wire the power inverter it will need to handle 180 amps at 22 volts for a 4,000w start up loads and 83 amps at 24 volts for 2,000w of rated load.
    I will probably wire up the inverter with 2 gauge cable.
    It will easy handle 83 amps.

    Later on this battery will probably end up out in the well house for 24v well power.
    Are you totally off the grid and powering everything from the inverter?
    Miller Trailblazer Pro 350D
    Miller Suitcase MIG
    Miller Spectrum 2050
    Miller Syncrowave 250DX
    Lincoln 210MP

  5. #5
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    Sep 2013
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    west texas
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    Re: power inverter for garage

    Oh no I have a power just like everyone else.
    If I do go off grid it will be on a 48v system, I would probably use a hybrid radian 120/240 inverter powered by forklift batteries of 850 to 1,000ah at 48v. Which would be two 24v batteries that are each 3 to 4 times the size of this one.
    With about 7kw of solar panels.

    Yes I am trying to go off grid, I'm working on getting the well going, it's already dug just need to put pumps and plumbing in and got my wood furnace.

    I forgot to mention the 24v forklift battery and inverter will provide power for my wood furnace and it's blowers when the power goes out.
    Last edited by mad welder 4; 09-07-2018 at 08:47 AM.
    old Miller spectrum 625
    Lincoln SP-135 T, CO2+0.025 wire
    Miller model 250 and WP-18V torch
    Craftsman 100amp AC/DC and WP-17V torch
    Century 115-004 HF arc stabilizer
    Home made 4 transformer spot welder
    Home made alternator welder

  6. #6
    Join Date
    Apr 2018
    Posts
    46

    Re: power inverter for garage

    The cheapest thing to do would be having the DC power a universal motor which powers an induction motor to create your AC. It will be hard to plan out and build but dirt cheap.
    Help...an army of blobs took up guns

    ...and folks that is why we have gun control laws

    nicksgarageinc.blogspot.com NJ

  7. #7
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    Re: power inverter for garage

    Quote Originally Posted by n00b View Post
    The cheapest thing to do would be having the DC power a universal motor which powers an induction motor to create your AC. It will be hard to plan out and build but dirt cheap.
    Hysteresis and eddy current losses compound with a setup like this. The loss of efficiency through heating would deplete your storage battery charge faster then a newer digital inverter.
    Slob

    Purveyor of intimate unparalleled knowledge of nothing about everything.

    Oh yeah, also an unabashed internet "Troll" too.....

  8. #8
    Join Date
    May 2014
    Location
    Central Wa. state
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    Re: power inverter for garage

    Quote Originally Posted by Slob View Post
    Hysteresis and eddy current losses compound with a setup like this. The loss of efficiency through heating would deplete your storage battery charge faster then a newer digital inverter.
    Friction losses too.

  9. #9
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    Re: power inverter for garage

    Quote Originally Posted by 12V71 View Post
    Friction losses too.
    Yep. Bad deal any way it's looked at for efficiency.
    Slob

    Purveyor of intimate unparalleled knowledge of nothing about everything.

    Oh yeah, also an unabashed internet "Troll" too.....

  10. #10
    Join Date
    Sep 2013
    Location
    west texas
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    Re: power inverter for garage

    Quote Originally Posted by n00b View Post
    The cheapest thing to do would be having the DC power a universal motor which powers an induction motor to create your AC. It will be hard to plan out and build but dirt cheap.
    No it wont.
    Thestand by losses on the 24v inverter is something like 2 watts.
    The stand by losses on a 7kw radian should be less than 20 watts.
    The stand by losses on a rotory converter would be around 1,000 watts.
    Plus an induction motor won't produce hardly any power when spun.

    My stuff is actually going to work.
    old Miller spectrum 625
    Lincoln SP-135 T, CO2+0.025 wire
    Miller model 250 and WP-18V torch
    Craftsman 100amp AC/DC and WP-17V torch
    Century 115-004 HF arc stabilizer
    Home made 4 transformer spot welder
    Home made alternator welder

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