Need help selecting an inverter [RE-wrenches]

[Darryl Thayer]

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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