DC-DC's for Deep Well Pumps[RE-wrenches]

[John Raynes]

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At 02:54 PM 5/16/02 -0600, you wrote:
>Please make the results available to the Wrenches, John.
>48-12V 5 to 20A output;
>48-24V 5 to 20A output;
>24-48V 5 to 10A output;
>and 24-? to serve as power supply for the SQ flex?
>Thanks, Allan


Allan (and whoever else is interested),

OK, I'll do a little digging when I'm back in the office over the 
weekend.  Got a couple more questions first:

Do you want to use them on PV direct as well as battery?  It affects the 
input voltage range.  For battery bank connection, I normally assume the 
DC-DC input voltage should work up to 1.5 X nominal voltage.  For PV 
Direct, I would assume 2X.

What do you feel is the maximum acceptable idle power draw for the 
converter?  Like inverters, most of these devices will draw some current at 
no load.  To get around this, a lot of models have soft-start lines that 
can be wired up to a control contact, like on an LCB.  But others don't 
have this option, so it's probably best to look at it both ways.

I took a quick look at some sites selling Wilmore converters.  The ones I 
saw look like full-fledged instruments, not components.  Really nice, but 
you're probably paying for a lot more product than you need.  I think we 
can dig up some better options among fully UL-listed components.  Most will 
need to be part of some larger system enclosure,  preferably metal for heat 
sinking. And they'll need their own fusing and/or disconnect.  But that 
shouldn't be a problem if it's designed in to a system.

Regards,

John Raynes
Principal Engineer
Raynes Engineering, Inc./RE Solar
Sandy, UT

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