SWR2500U Some derating likely [RE-wrenches]

[Joel Davidson]

Mo,
Thanks for the solid feedback!
Joel Davidson

Mo Rousso wrote:

> I know Joel is looking for some hard data, but I can only offer my
> observations.
>
> We installed 24 BP MSX-120 (12VDC nom) on 1 SB 2500 on an open southern
> exposure roof with a pitch angle of 18 degrees.  The owner wanted to push
> the inverter to the max and we added a 25th panel to the string.
>
> The inverter is mounted on an interior south facing wall of the garage
> (please don't yell at me John!!!) in Fallbrook, CA.
>
> On those days when we had nice bright skies and cool temps the inverter
> would go into derate mode.  However, we added a fan to the heat sink and the
> derate issue has been completely eliminated.  The customer is getting every
> erg he can out of the set-up and is now a happy camper.
>
> I decided to add a fan to my SB to see what would happen.  My home has 20 BP
> 2150s modules with 10 modules per pole on DP&W TPM racks.  Both poles feed a
> single SB2500.  In the past, I would occasionally  see derates maybe 20
> times per year for a 1 to 2 hour period each.  The fans I mounted are DC and
> are powered by a 10W PV module that is oriented so that it powers up the
> fans around 10 AM until dark.  All deratings have ceased and I have actually
> seen my SB display post an output reading of 2507 watts.
>
> My goal is to build a small DAQ system and actively log my system
> performance so that I have hard data to analyze.  Until then, if derating is
> an issue, put on a fan - it works.
>
> Mo
> --
> Mo Rousso
> HelioPower
> Renewable Energy Systems
> Remote Power Solutions
> mrousso at heliopower
> www.heliopower.com
> 760.845.8843
>
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