Need advice for an inverter

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Need advice for an inverter

Postby ericd012 on Sat Jan 05, 2019 3:35 pm

Hi everyone,

I'm not sure if I did post in the right section, Im currently building a mobile unity for road service reparations. Current setup is 3 battery automotive 8d 1500cca, a generator of 15% thd 9000watt. I got a 220v 1phase air compressor to run, tig and mig welders that needs a thd lower than 5%. My problem right now is I canno't run my devices with the thd too high, I would like to find an inverter able to take the output from my generator and "purify" it by passing the current in the inverter. With this inverter with low current devices like grinder, drill, sometime air compressor I would run it with the battery, but when more power needed with the inverter I would just start-up the generator. At the end of the day I would charge my batteries to get them back at 100% with the inverter.


I don't know mutch with inverters, hope you guys can help me find a solution.

Thanks,
-Eric
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Re: Need advice for an inverter

Postby Mike Curran on Mon Jan 07, 2019 9:41 am

Outback's inverters won't "purify" any AC fed in to them. Any AC in is simply passed through to the AC loads without modificatioon.

They can use somewhat dirty AC to charge a battery, then later invert the battery DC to AC for your AC loads. You'd need a lot more battery for this scenario to work for your sizable AC loads, though.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
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Re: Need advice for an inverter

Postby ericd012 on Fri Jan 11, 2019 12:27 am

Is there a way to purify it? I heard that some people say's to put a steady 100watt on it, I'm looking something more effective if possible. Because on the other half a generator that has a good wave/low thd will give less power, wich is problematic in my case.


thanks,
-eric
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Re: Need advice for an inverter

Postby Kurt Lundquist on Fri Jan 11, 2019 2:55 pm

Hi Eric,

I think your money would be best spent by getting a generator that is rated for 5% THD or less. Look at inverter generators like the Honda EU series. Your 8D batteries are not going to last long supporting 2 welders and an air compressor even if an inverter could clean up the power. The other options for cleaning up the power output (UPS or Ferroresonant transformer) will probably cost as much or more than the generator and they decrease efficiency.

-Kurt
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Re: Need advice for an inverter

Postby Shadow_Storm56 on Wed Feb 20, 2019 7:06 pm

You could get like 3 8048a radians and a separate huge charger so that it took the ac from the gen and put it to DC...then the inverters take it back to ac.
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Re: Need advice for an inverter

Postby raysun on Wed Feb 20, 2019 10:26 pm

Kurt is giving sage advice. For clean power, and lots of it, a quality inverter generator is the best way to go. My Honda EU7000is can accommodate 5kW loads with clean power.

To provide 5kW with a battery/inverter would take a buttload of battery power.

Way easier to carry around 5 gallons of gas for a fuel injected engine/inverter combo, than it is 500 lbs of battery for the battery/inverter combo.
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Re: Need advice for an inverter

Postby Violet Hill on Thu Feb 21, 2019 11:34 am

The Honda EU7000is is not a good welding generator as the welder can overload it I have 15amp 230v Plasma Cutter it need a min of 11kw generator so it will overload Eu7000is
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Re: Need advice for an inverter

Postby raysun on Thu Feb 21, 2019 11:43 am

FWIW, we run a 220V arc welder from our EU7000is all the time with no problems.
Last edited by raysun on Thu Feb 21, 2019 11:55 am, edited 1 time in total.
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Re: Need advice for an inverter

Postby Violet Hill on Thu Feb 21, 2019 11:55 am

Yes you need to ask the makers of welder (E.g. my BOC Smoothcut 40 Plasma cutter I ask BOC for the spec for to use a generator and it was 11kw it will be on the spec sheet and yes it will max load, but Eu7000is is lots $$$ to overload and kill it.
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Re: Need advice for an inverter

Postby raysun on Thu Feb 21, 2019 11:58 am

Violet Hill wrote:Yes you need to ask the makers of welder (E.g. my BOC Smoothcut 40 Plasma cutter I ask BOC for the spec for to use a generator and it was 11kw it will be on the spec sheet and yes it will max load, but Eu7000is is lots $$$ to overload and kill it.


I'm still confused. Are you saying your experience with this one highly reactive cutter is applicable to all welders on the market? There isn't any welding equipment a 5kW generator will power?
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Re: Need advice for an inverter

Postby Violet Hill on Thu Feb 21, 2019 12:10 pm

Yes need to ask the maker of each welder, DC welder is not same as AC welder (a DC welder generator is made to welder first then to supply a little extra of power but AC generator (EU7000is is made power)
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Re: Need advice for an inverter

Postby raysun on Thu Feb 21, 2019 12:25 pm

So you are saying match the tool to a proper power source? That certainly makes sense.

We run a lot of tools off our EU7000is. I guess we did our homework.
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Re: Need advice for an inverter

Postby Violet Hill on Thu Feb 21, 2019 1:08 pm

Basically yes
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Re: Need advice for an inverter

Postby Shadow_Storm56 on Sat Feb 23, 2019 3:27 pm

An inverter will not purify the power, but in support mode it will help the main source so it may help the voltage be more stable. The only way to purify the power is to charge the batteries and discharge them with the inverter.
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Re: Need advice for an inverter

Postby pss on Sat Feb 23, 2019 6:19 pm

Have you looked into buying a power conditioner?
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