Need advice for an inverter

Discussion about OutBack Inverters in RV Applications

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ericd012
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Need advice for an inverter

Post by ericd012 »

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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Mike Curran
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Re: Need advice for an inverter

Post by Mike Curran »

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.
https://ei.tigoenergy.com/p/pZXn7SZQyO45
https://enlighten.enphaseenergy.com/public/systems/Hctc107221
ericd012
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Re: Need advice for an inverter

Post by ericd012 »

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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Kurt Lundquist
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Re: Need advice for an inverter

Post by Kurt Lundquist »

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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Shadow_Storm56
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Re: Need advice for an inverter

Post by Shadow_Storm56 »

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.
raysun
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Re: Need advice for an inverter

Post by raysun »

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

Post by Violet Hill »

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
raysun
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Re: Need advice for an inverter

Post by raysun »

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 10:55 am, edited 1 time in total.
Violet Hill
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Re: Need advice for an inverter

Post by Violet Hill »

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.
raysun
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Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Need advice for an inverter

Post by raysun »

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?
Violet Hill
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Re: Need advice for an inverter

Post by Violet Hill »

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)
raysun
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Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Need advice for an inverter

Post by raysun »

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.
Violet Hill
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Location: New Plymouth New Zealand

Re: Need advice for an inverter

Post by Violet Hill »

Basically yes
Shadow_Storm56
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Re: Need advice for an inverter

Post by Shadow_Storm56 »

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.
pss
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Re: Need advice for an inverter

Post by pss »

Have you looked into buying a power conditioner?
daltonbourne
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Re: Need advice for an inverter

Post by daltonbourne »

I purchased an inverter AIMS POWER and installed it in my motor home and love it. This was version 2.0 of my generator's electrification project. I had first purchased a modified sine 3,500-watt inverter which I powered from 4 six volt golf cart batteries. The modified sine unit was good but my microwave and other electronics didn't like the square wave. Another problem is that the AC voltage declined all the way down to 85 volts as the batteries discharged. My Aims unit puts out 121-123 volts at 60 cps all the way down to low voltage cutoff.
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