I've run a 3 Hp pump on a pair of VFX 3648s, but then the 2nd issue was
DC voltage sag from the batteries. We had a string of Rolls 5000s that
could not keep the voltage high enough below 70% SOC. Be sure to have
plenty of battery behind this system. Also you might look into the soft
start controllers, I've used some from Franklin that were a cheaper
option than a bigger inverter.
Ray Walters
Remote Solar
303 505-8760
On 7/26/19 7:32 AM, Jeff Clearwater wrote:
Thanks Ray and Jerry,
Great to hear from you both with your years of combined experience :)
So yes looking at the 5 sec has me switching back to a trusty Radian -
even then from what you are saying it may not work.
And you are right Ray - Outback is careful to rate the "overload
capability" in KVA rather than KW due most likely to voltage sag of
course.
So this 53 LRA 2 HP motor - if I can only trust the 5 second (50 A)
might not start - especially with other loads on the system?
RADIAN SURGE RATINGS:
Maximum Output Current
1 ms peak 100 Amps AC at 240 VAC, 200 Amps AC at 120 VAC
100 ms RMS 70.7 Amps AC at 240 VAC
Overload Capability
100 ms surge 16.97 kVa
5 seconds 12 kVa
30 minute 9 kVa
Other's experience with 2 HP sewage pump or well pump motors on a Radian?
Thanks!
Jeff
Ray wrote on 7/25/19 5:48 PM:
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 offgridso...@sti.net
<mailto:offgridso...@sti.net> text 209 813 0060*
On Mon, 22 Jul 2019 07:26:07 -0700, Jeff Clearwater
<je...@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 offgridso...@sti.net
<mailto:offgridso...@sti.net> text 209 813 0060*
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