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  #11  
Old 03-23-2009, 05:27 AM
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I'm happy with the Xantrex so far but I haven't really loaded it up yet. I think the most power I've pulled through it has been about 300 watts.
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  #12  
Old 03-23-2009, 01:19 PM
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You can check out these guys, they carry a full range:
www.invertersrus.com

I understand not buying crap but even Dave admitted that the high-end full sine wave stuff is overkill for intermittant use. For me there is no way I can justify the extra expense.

I know what I plan to run and accept the limitations so I bought a 1200 watt modified-sine Vector. I won't need more than 7-800 watts and hope running below max means longer life.
I realize it is likely built overseas but they are owned by Black and Decker (as is Dewalt) so I feel reasonably confident about the quality (as a much as I can on a "low-end" unit) or at least know the 2 yr warranty has a large company behind it.
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  #13  
Old 03-23-2009, 05:10 PM
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Quote:
Originally Posted by treerootCO View Post
Why would an inverter list a, "Max operating altitude 15,000 (4570 m)"?
Air is an insulator. Thin air isn't as good an insulator as sea-level air. No air allow electrons to travel about freely. Avionic and space qualified electronic hardware needs to be coated with conformal insulation to prevent excessive leakage current, or in worst cases, arcing.
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  #14  
Old 03-23-2009, 08:21 PM
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Quote:
Originally Posted by Rzeppa View Post
Air is an insulator. Thin air isn't as good an insulator as sea-level air. No air allow electrons to travel about freely. Avionic and space qualified electronic hardware needs to be coated with conformal insulation to prevent excessive leakage current, or in worst cases, arcing.
In this case it's a cooling issue rather than requirement for conformal coating. Thin air is less efficient for cooling than sea level because lower density air provides less convective cooling. The military has experimented with compressed air at high altitude to cool electronics to alleviate overheating. We conformal coat space electronics more to prevent tin and zinc whisker and lead dendrite growth, not so much direct ionization. The whisker growth does lead to shorting, arcing and plasma creation, which can definitely cause headaches and failures.
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  #15  
Old 03-23-2009, 09:38 PM
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Quote:
Originally Posted by DaveInDenver View Post
In this case it's a cooling issue rather than requirement for conformal coating. Thin air is less efficient for cooling than sea level because lower density air provides less convective cooling. The military has experimented with compressed air at high altitude to cool electronics to alleviate overheating. We conformal coat space electronics more to prevent tin and zinc whisker and lead dendrite growth, not so much direct ionization. The whisker growth does lead to shorting, arcing and plasma creation, which can definitely cause headaches and failures.
That's an excellent point, especially considering most inverters operate with forced air cooling. When I designed power supplies we were more concerned with leakage current on the control side messing up the feedback and with arcing on the output side. Thermal considerations are always a concern in higher power applications though - among the designs I used to do were multi kW units to run high power lasers, and of course audio amps for my own use. But the really high voltage units (ion generators, cow prods, mass spectrometers, etc.) were the most fun - 10kV and higher. Then you really get into cool arcing. In a mass spectrometer, when you pump out the air and get into high vacuum situations the electrons pretty much run free and you have to control everything with magnetic fields and insulation.
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  #16  
Old 03-27-2009, 07:50 AM
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Quote:
Originally Posted by treerootCO View Post
Why would an inverter list a, "Max operating altitude 15,000 (4570 m)"?

http://www.westmarine.com/webapp/wcs...9&classNum=678

Heat dissipation
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  #17  
Old 05-06-2010, 11:25 AM
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just bought one of these:

http://www.tripplite.com/en/products...xtModelID=2905

from here:

http://www.shopblt.com/cgi-bin/shop/...er_id=!ORDERID!

We'll see how it works!
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  #18  
Old 04-03-2011, 09:13 PM
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I picked up a Tripp Lite on ebay a couple weeks ago, got it hooked up to the 80 today. I like it so far, the fan doesn't run continuous which is a nice upgrade. So far so good...

here's a similar one if anyone else needs one http://cgi.ebay.com/Tripp-Lite-1800-...item43a62fa37a
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  #19  
Old 04-03-2011, 09:24 PM
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Sweet Tim!

FWIW, I ended up cancelling the order I placed with the store that I posted and got mine from Ebay too.

I like mine, and so far it has worked fine...

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  #20  
Old 04-03-2011, 11:26 PM
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Hey did you connect anything to the ground that's below that plug on the right? Should I jumper a wire from there over to the big ground on the back side?
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