Need help selecting an inverter [RE-wrenches]

[Doug Pratt]

Hi Daryl,

  Outback is your salvation for this on-again, off-again widely variable
situation. A multi-inverter stacked set with auto transformers will deal
easily with your unbalanced start-ups, and the really cool part is that
it will only turn on as many inverters as are needed at the moment.
During the quiet periods only a single inverter will be "on". Contact
the folks at Outback for help properly putting it together.

  The SW5548 inverter is a poor choice for surge loads. The software was
written "tight", and won't allow very much AC voltage sag before
tripping off. The SW4048 is actually much better at surge loads, and the
lowly SW4024 is better yet. With each generation of SW inverter
developed, the AC voltage allowance got written tighter and tighter.
It'd be really nice if the Xantrex folks actually told us this kinda
stuff. I think there was some discussion on the list about this a couple
years ago.

Cheers,
Doug Pratt

-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com] 
Sent: Saturday, August 23, 2003 6:25 PM
To: re Wrenches
Subject: Need help selecting an inverter [RE-wrenches]

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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