3 Sharp 200W in series to MX60 [RE-wrenches]
Christopher Freitas --- OutBack Power
cfreitas at outbackpower.com
Wed Feb 8 13:23:26 PST 2006
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David Palumbo wrote:
> 135.75 Voc Temp Corrected. What do you think?
> The OutBack MX60 Manual now states that PV open circuit v
> maxes out at 150v. Operation is suspended at 135vdc.
The current MX60s actually suspend operation at 143 vdc and are fully
ETL / UL listed to withstand 150 vdc worse case with sufficient design
margin to be reliable. We do have reports of cold locations were
MX60s exceed the 150 vdc limit frequently without problems - but we do
not recommend it and is not code compliant.
The actual PV cell material heats up as soon as any significant sunlight
hits the PV module - so in the real world we have seen lower open
circuit voltages then the datasheets suggest. I have also heard that
the Maui Solar software will also predict lower maximum open circuit
voltage than the NEC code method - not sure of why however.
These Sharp 200 watt modules are actually a very nice match with the
MX60 and 48 vdc applications even in very cold locations. I say go for
it!
Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030
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