SunFrost Voltage Upgrade question [RE-wrenches]

[Jeremy Rodriguez]

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I have used the Solar Converters product to power a Sunfrost from a 48v 
battery bank. Works great. On a side note, I tapped from two of the L16 
for about a month for temp power and had to replace those two batteries. 
I did not think it would damage them that quick.

Jeremy
All Solar

Ian Woofenden wrote:
> 
> 
> I've been using a Vanner equalizer to tap 12 V from our 24 V battery 
> for about 20 years. I wish I knew the efficiency. I do know that it 
> works, and that the equipment lasts.
> 
> Ian
> 
> 
> >Hi Allan.
> >
> >You mentioned a center tap. A long time ago, I helped set up a 
> >system for a local nonprofit that had 24 V batteries and 12 V loads. 
> >We used a Vanner Equalizer to tap 12 V off the bank. What it does is 
> >monitor the tapped 12 V side, and when it sees lower voltage on that 
> >side, transfers energy from the untapped side.
> >
> >I have not heard of these units in a long time, so checked and the 
> >web site and they are still there, www.vanner.com
> >
> >I suppose a DC-DC converter might be a more efficient, but the 20 A 
> >Equalizer advertises >92%, which is not horrible.
> >
> >Allan Sindelar wrote at 03:03 PM 07/20/2006:
> >
> >>Here is followup on the Danfoss compressors. I spoke with Larry at Sun
> >>Frost. Units built within the last 3 or 4 years have the switchable 
> >>voltage,
> >>12/24. Units built before this time are fixed voltage. Switching both
> >>compressor and power module would be required and would be very 
> >>expensive.
> >>So Larry recommends a DC converter. He further says worst case on a
> >>two-compressor RF16 would be one compressor starting (15A) and one 
> >>running
> >>(5A), thus requiring a converter of 20A capacity.
> >>
> >>So we are back to my original question (with appreciation for the good 
> >>new
> >>info so far): whose DC converter have you used with good success?
> >>
> >>Thanks again,
> >  >Allan @+E
> 
> 
> -- 
> 
> Ian Woofenden <ian.woofenden at homepower.com>, Senior Editor
> Home Power magazine; Subscriptions: $22.50 per year, PO Box 520, 
> Ashland, OR 97520 USA
> 800-707-6585 (US), 541-512-0220, or download free sample issue at 
> <http://www.homepower.com>


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