Help w/large o-t-g inverter! [RE-wrenches]

[Darryl Thayer]

Hello
I have a motor with 130 amps starting surge on the
grid, and I start this load with 4 outback VFX3648s. 
I do not know the starting current with the outbacks
but I think it must be less.  The outback might sort
of soft start the motor.  

Please note that not all motors are the same.  B type
induction motors start withcurrent and less torque
than say D type.  Submersible pumps have a higher
starting surge per hp than other motors.  Also
submersible motors have a bearing than must be
presurized very soon after start and therefore do not
like to be soft started.  

Darryl

--- Ray Walters <ray at solarray.com> wrote:
> I've got 2 Outback related questions while were at:
> 1) Can you stack three inverters with a transformer
> for 3 wire single phase 
> 220? ( a customer wanted to save some money)
> 2) What is the maximum pump HP that can be run with
> a pair of Outback VFX 
> 3648s. I have two customers each with deep well 3 Hp
> submersibles.
> My Franklin motor book shows for a 3 HP pump a
> maximum current of 17Amps 
> (230v) but a locked rotor current of 83 amps,
> meanwhile their suggested 
> breaker size is 40 amps. The Outback 1Ms surge is 70
> amps, the 100Ms surge 
> is 50 amps, the 5 sec surge is 41.6 amps. Sure seems
> like a pair of the 
> Outbacks would run a 3 Hp pump, but could overload
> occasionally with other 
> loads on.
> I've run a 2 Hp pump with a single DR 3624 and T240
> transformer, although I 
> advised the customer to use it for emergencies only.
> Any real experience with Outbacks out there?
> 
> Thanks beforehand,
> 
> Ray Walters 


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