12 volt differential controller [RE-wrenches]

Carl Emerson, Free Power Ltd. freepower at freepower.co.nz
Sun Oct 12 15:07:17 PDT 2003


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Kurt,

I would like to swap to this approach but I suspect that it would take 
some time to optimize the threshold or insolation level that the pump 
comes on at.... or do you not bother.

Also the pump will continue to run when the water is fully up to 
temperature unless there is a thermostat control as well.

Maybe a combination of the two is needed and would be more efficient.

Carl Emerson
Free Power Ltd.
Auckland. NZ

sunwise wrote:

>Greetings Mark,
>
>I'm not going to be much help regarding the 12 volt controller but I
>will mention a trend I see in the industry that does away with
>differential controllers completely.  Instead of using such a
>controller, a small (20 watt) solar panel is wired directly to a 12 volt
>circulating pump (typically a Hartel HEH10).  When the sun is shinning
>on the flat-plate collectors it is also on the pump panel, etc.  These
>systems work great, especially in off-grid homes.
>
>Kurt Nelson
>  
>

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