[RE-wrenches] 100ms for Locked Rotor Amps?

[Ray]

I only look at the 5 sec and 30 sec surge ratings to get an idea what an 
inverter can really do in the real world.  All those millisecond 
ratings/ in rush current specs won't get a pump or motor started, and 
will basically just get you into trouble.  The reason they have those 
ratings in amps and not watts, is that the voltage craters during that 
100mS surge.

I can't tell you how many times we tried to start a pump, compressor, or 
large table saw, and the inverter just shut off, even though the "in 
rush current" was within the theoretical inverter capacity.  Actual 
Wrench list testimonials are much more valuable than those arcane specs.

Ray Walters
Remote Solar
303 505-8760

On 7/25/19 5:15 PM, Jeff Clearwater wrote:
> Hey There Wrenches,
>
> So be advised that after a little research the SW dual stack will NOT 
> double the surge ratings of a single SW.
>
> But that brings me to my second question:
>
> What inverter surge rating should one refer to when looking at maximum 
> Inrush or LRA - 1ms?  100ms?  1 sec?
>
> Yourengineering wisdom welcomed!
>
> Thanks,
>
> Jeff
>
>
>
> Jeff Clearwater wrote on 7/23/19 8:27 PM:
>
>> Thanks for the tip!  I'll check the firmware.
>>
>> Dave Angelini Offgrid Solar wrote on 7/22/19 9:11 AM:
>>
>>> Hi Jeff,
>>>
>>> I am not going to guess if this will work, it should.  I use XW's 
>>> because they start anything I have come across.
>>>
>>> If you do this, make sure but SW's have the latest and same 
>>> firmware. There were problems with stacked SW's early on in their 
>>> development.
>>>
>>> *Dave Angelini Offgrid Solar "we go where powerlines don't" 
>>> http://members.sti.net/offgridsolar/ e-mail offgridsolar at sti.net 
>>> <mailto:offgridsolar at sti.net> text 209 813 0060*
>>>
>>> On Mon, 22 Jul 2019 07:26:07 -0700, Jeff Clearwater 
>>> <jeffc at villagepowerdesign.com> wrote:
>>>
>>>> Hey Esteemed Wrenches,
>>>>
>>>> So I recently built a power trailer with a single 4 KW (4048) 
>>>> Schneider SW for a client with a moderate cabin lifestyle.
>>>>
>>>> But he lives on a high hill and even though his 2 HP Macerator is 
>>>> only rated at 15 amps continuous that baby starts up with a 
>>>> whopping kick - probably close to or at it's 53 Amps Locked Rotor 
>>>> rating.
>>>>
>>>> The SW has the following surge capability:
>>>>
>>>> SW 4048 Rated@ 240 Volts:
>>>> Continuous - 15.2 Amps 3700 Watts
>>>> 30 Minutes - 18.3 Amps 4400 Watts
>>>> 5 Secs - 29.2 Amps 7000 Watts
>>>> Max (100ms?) - 41 Amps - 9840 Watts
>>>>
>>>> Can I be confidant that 2 stacked SWs will start this baby?
>>>>
>>>> Any experience with similar macerators - or simply educated guesses?
>>>>
>>>> Thanks!
>>>>
>>>> Jeff
>>>>
>>> -- 
>>>   
>>> *Dave Angelini Offgrid Solar "we go where powerlines don't" 
>>> http://members.sti.net/offgridsolar/ e-mail offgridsolar at sti.net 
>>> <mailto:offgridsolar at sti.net> text 209 813 0060*
>>
>>
>>
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