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

[jay peltz]

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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