Sayo HIP Modules with MX60 [RE-wrenches]

[Jeremy Rodriguez]

Thanks Guys!

Ryan Mayfield wrote:
> 
> Jeremy,
> 
> To determine the adjusted Voc use the formula:
>  
> Vadj = Voc + ((Tcell - Tstc) * temp coefficient)
> 
> Note the temperatures are in degrees C with Tstc = 25C. 
> 
> Also, you should use coldest temperature, not coldest daytime ambient 
> temperature. Your modules will go to Voc early in the morning before the 
> sun strikes the modules and produce any current. It is generally 
> recommended to use record low temperature for that calculation, that way 
> you should never exceed voltage limits. OutBack has some protection to 
> compensate for over voltage conditions but a good design practice would 
> be to avoid that situation altogether, especially if you can find 
> yourself exceeding 150Voc on a regular basis.
> 
> That said I think you are in a tough spot. If you put two modules in 
> series you will exceed the 150Voc limit but if you don't the voltage 
> loss due to heat in the summer will drop you below your battery charging 
> voltage. In that case, I think the MX60 would hold your array at the 
> necessary voltage to charge your batteries but it will have to come at 
> the cost of the current.
> 
> Seems to me like these aren't the best panels for your situation.
> 
> Ryan
> 
> 
> 
> -----Original Message-----
> >From: Darren Emmons <darren at solarhacker.com>
> >Sent: Nov 1, 2006 9:48 PM
> >To: RE-wrenches at topica.com
> >Subject: Re: Sayo HIP Modules with MX60 [RE-wrenches]
> >
> >
> >Jeremy,
> >
> >See Outback Forum for postings on MX60 and Sanyo modules.
> >
> >http://www.outbackpower.com/forum/viewtopic.php?t=1481
> >
> >
> >Darren
> >Solar Hacker Software
> >North Bend, WA
> >
> >
> >Jeremy Rodriguez wrote:
> >> Wrenches, 
> >> I have a customer with HIP 195's to connect to an MX60. Battery voltage 
> >> is 48. The VOC nameplate rating is 68.1 each module. I'm not sure how to 
> >> 
> >> compute the Temp Coefficient of -0.170 (V/degC). The coldest ambient 
> >> daytime temp could be 10F here in Colorado. Any help or advise would be 
> >> appreciated.
> >>
> >> Jeremy
> >> All Solar
> >> Penrose, CO
> >>
> >>
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