[RE-wrenches] Off-grid 1nverter replacement for 3 HP

[bob ellison]

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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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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