I haven't analyzed the circuit, but in general most power supplies
don't like it when there is voltage on the output and nothing on the
input side.

You might follow the step up circuit with a charging circuit, or
perhaps a simple diode would be sufficient if you don't want to do
charge control.

-Adam

On 8/14/08, Matthew Miller <namiller2@naxs.net> wrote:
> Hello,
>
> I posted about this a while back and this is a bit of an update. I have an
> electric golf cart that has solar panels mounted on top the canopy. The
> solar panels produce about 15V under load and the lead acid battery pack has
> a voltage of 48V. My problem is to raise the panel voltage in order to
> charge the batteries.
>
> My first attempt was to build a boost converter using the LT1680
> controller. I built the typical application circuit that is in the device's
> datasheet and under workbench tests it operated fine, with the exception of
> a bit of audible noise. The web page for the LT1680 is here:
> http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1042,C1031,C1115,P1597
>
> My trouble is that I connected the converter ground to the battery pack and
> then when I touched the positive wire to the battery terminal there was a
> big blue spark and now the converter is no longer working. :( I haven't
> repaired the converter yet, but I'm wondering if the converter design I used
> is appropriate for this application?
>
> I would appreciate any suggestions, insight, or questions.
>
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