I've run a 3 HP well pump off a pair of Outbacks, but make sure you have
plenty of battery behind it. We had shut downs from low voltage, when
the batteries were at 50% charge from the starting surge.
My experience with Magnum has been good, and they have even more surge
current than the Outbacks.
Yet another thing to consider is changing the load. That saw might work
just fine with a 2 Hp motor.
Ray
On 10/14/2012 6:54 AM, d...@foxfire-energy.com wrote:
I like Outback because I can rebuild them on the wall. I'd be eying
two VFX3648 (Or VFX7248 is what they used to call them).I suspect
Magnum is similar, but I really haven't seen that many around. As for
starting motor loads, NEC article 430 has gobs of info on projecting
starting currents and sizing conductors (Check out the tables toward
the end of the article). Keep in mind much has to do with conductors
sizing.I'd be shooting for a max loss of 3% at full current draw..
especially in the low voltage conductors.As for installation, I like
set ups where the inverters are inclosed in a closet and set up so
that the main fresh inlet air to the building washes thru the closet
(Powered by gravity - no fans). Good luck. db
Dan Brown
Foxfire Energy Corp.
Renewable Energy Systems
(802)-483-2564
www.Foxfire-Energy.com <http://www.Foxfire-Energy.com>
NABCEP #092907-44
-------- Original Message --------
Subject: Re: [RE-wrenches] Off-grid 1nverter replacement for 3 HP
From: "bob ellison" <reelli...@gmail.com <mailto:reelli...@gmail.com>>
Date: Sat, October 13, 2012 7:01 pm
To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org
<mailto:re-wrenches@lists.re-wrenches.org>>
I have had inverters ruined by drywall dust, it literally filled
them within a couple years as the owner worked on his house. Next
thing I am getting a call that it would not work....
I doubt that sawdust would be any different.
Later,
Bob Ellison
*From:*re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of
*jay peltz
*Sent:* Saturday, October 13, 2012 5:28 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Off-grid 1nverter replacement for 3 HP
HI Hilton,
Before you go anywhere you need to know what the draw on this
motor is.
I've seen 3 hp motors not be able to start on a 15kw genny.
Why? Just horrible motors thats all.
jay
peltz power
On Oct 13, 2012, at 11:16 AM, Hilton Dier III wrote:
I have an off-grid client who is having trouble with his aging
Xantrex SW4024 inverter and is considering an upgrade. I need some
advice.
One of his problems with his present system is that he can't run
his 3 HP 240VAC table saw on the 4024. He'd be content to run his
generator for any long sessions of sawing, but he'd like the
capability to do a cut or two without firing it up.
I was thinking about stacking a couple of Outbacks. I'd like to
know people's real-world experiences with the relationship between
motor HP, rated inverter watts, and surge watts. How much wattage
does he need to actually do the job? That is, without flailing the
inverter(s) into a shortened life span.
Also, how do Outbacks compare with Magnums or whatever? I have
been using Outbacks for a while with good results, but I have been
hearing murmurs and grumbling since they were bought out. I
haven't used Xantrex/Schneider for a while and I have no
experience with Magnums. I notice that the Magnums offer split
phase 240.
I should note that he has his inverter setup in his wood shop. I
am theorizing that some of his inverter trouble could be from a
tree's worth of sawdust in the case. He presently has a 24V
system, but he is considering a battery replacement, which would
be an opportunity to switch to 48V if necessary. The sawdust issue
makes me lean towards the sealed Outbacks, but he does have a
partially finished box for the inverter with filters and a fan.
Opinions?
Many thanks.
Hilton
--
Hilton Dier III
Renewable Energy Design
Partner, Solar Gain LLC
453 East Hill Rd.
Middlesex, VT 05602
Tel: 802-223-6652
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