SunFrost Voltage Upgrade question [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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I think all of the SunFrosts are 12/24 vdc compatible - it's a feature
of the Danfoss compressors the they use on them. 

You might give Larry at Sunfrost a call.

Christopher Freitas
OutBack Power Systems


-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Thursday, July 20, 2006 11:07 AM
To: New wrenches posting
Subject: SunFrost Voltage Upgrade question [RE-wrenches]

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Esteemed Wrenches,
We are upgrading the 12V PV power system of a 1995-era tire house, as
the
original U2512SB inverter has failed and Xantrex doesn't support it. We
are
raising nominal system voltage to 24V in order to accommodate future
system
expansion for new owners. The home includes a 12V DC Sun Frost RF16
fridge/freezer.

What has proven to be a reliable and simple means of running the Sun
Frost
off of 24V? I am assuming that I will use a Solar Converters 12/24 20A
converter, which has proven reliable in our experience for other
applications. I don't think we have ever used it on a Sun Frost, and I
am
looking for others' experiences. We have also never had a failure with
ICT
DC converters.

The batteries are currently to become a single string of L16s (the
former
owners brought in grid for backup charging), with eventual plans to
increase
battery capacity when these reach end-of-life. I could center-tap off
the
bank, as Steve Willey used to suggest, but have not done so, and this
will
be the only 12V load.

Your advice is much appreciated.

Allan at Positive Energy


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