Need help selecting an inverter [RE-wrenches]

[Greg Egan]

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Darryl,

I would use the Outback X-240 for balancing the legs.

You might also look for ways of getting the work done more efficiently. 
Maybe some of the equipment could use smaller or more efficient/higher 
power factor motors. Maybe there's some incandescent lights you can 
replace w/ FL's.

I'd sure try to find a way to keep from taking those heavy SW's off the 
wall : )

Best,

Greg Egan

-- 
Alaska Renewable Energy
981 Gold Mine Trail Fairbanks, Alaska 99712
Phone: 907-457-4299; Fax: 907-457-4290; Email: gegan at renewalaska.com
URL:  http://www.renewalaska.com



Darryl Thayer wrote:
> Hi everyone
> I have a system design problem.  
> 
> I have a system that needs 240 volt to start and run a
> 7-HP motor with full load current of 30 amps. And
> carry a 10-amp 240-volt motor load.   One leg of this
> also has to start a ¾ HP 9 amp 120-volt full load
> pump.  With miscellaneous loads such that one leg has
> 45 amps total and the other leg has 55 amps total. 
> The operation of the 7 HP motor is only for 2 to 3
> minutes then off for 20 minutes up to several hours. 
> However under extreame condition, it could run up to
> 30 % duty cycle.     
> 
> I tried two SW5548 and they seem to work but on start
> of the 7-HP motor will some times kick on overload.  
> What do more experienced people than I do in this
> case?  I have other use for the SW’s. I do not know if
> a soft start will work.  
> 
> Do you think two stacked sets of two FX3648 (or what
> ever the new vented Outback is numbered)  inverters
> would serve the purpose?  Should I use an
> auto-transformer to balance this load?  
> 
> What other inverters might work from a 48 volt battery
> set?  Can other inverters use the auto-transformer?
> 
> Daryl 
> 
> 
> 
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