SunFrost Voltage Upgrade question [RE-wrenches]

[Ian Woofenden, Home Power]

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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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