Earth Day Plans? [RE-wrenches]

Mon Aug 10 12:45:57 EDT 2026

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Hi Wally 
 
At 09:21 AM 02/29/2000 -0800, you wrote: 
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<blockquote type=cite cite>I am planning on taking&nbsp; my Solar energy trailer to the Earth Day event in downtown San Luis Obispo for show and tell, as well as powering up the stage. 
 
The catch is I am still working on it and not sure which inverter to go with as far as avoiding audio buzz goes.&nbsp; I am sitting on a&nbsp; U2512 ( a buzz box ) and a 24v XP1100.&nbsp; So I am torn between&nbsp; capacity and sine wave quality. I am willing to install a SW in it but curious if it is noise free in ALL sound systems.&nbsp; Any negative encounters out there with the SW and stage equipment?</blockquote> 
I have used and seen used the SW series several times for small sound stages. First two times got a heck of a buzz which was corrected by sinking a ground rod and attaching it to the SW ground lug. Now I sink the ground rod as a matter of course, with nary a problem. 
 
The solar crew used SWs (two 5548s and two 4024s) at the Hog Farm's Pignic for several years, but switched over to an 12 kw Exeltech MX (and a 20 ton truck nearly full of batteries). The SWs performed well, but were too big to haul around and install easily, and the Exeltech gave us power that was cleaner. 
 
One thing to be prepared for: generally sound people do not trust RE, they are afraid it will hurt their equipment and sound bad. You may have to prove to them that the power quality and voltage level is sufficient for what they want to do. For that reason, avoid anything that will buzz, and be very careful to over-size the inverter a bit. 
 
<blockquote type=cite cite>I suspect the Prosine would be the best for capacity and waveform but want to become more intimate with the day to day reality of the SW as it is most prevalent. 
 
One idea is for you to put together a small rolling&nbsp; system on a cart, wheelbarrow, or pickup truck and let folks see how easy (hee hee) it is to turn sunlight into 120 volts.</blockquote> 
We built such a little wagon for the Oregon Country Fair's Energy Park, and used it to power an electric band one night. Northern Tools has a great &quot;Big Red Wagon&quot; that we used, it will easily handle the weight of 6-8 T105s and a big inverter. Heart donated the mod sine inverter, and it worked great --as long as the band kept playing and didn't take a break, you could not hear the buzz. Mostly the cart was used for construction at the fair, and not powering electronics.</html>