Re: Advice needed regarding circuit with SLA batt in tin shed

In article <43925798$1_1@xxxxxxxxxxxxxxxxxxx>,
Jason S <jst3712@xxxxxxxxxxxxxx> wrote:
>
>"Ken Smith" <kensmith@xxxxxxxxxxxxxxx> wrote in message
[...]
>> A "thermal diode" heat pipe may help in your situation. It is just a
>> copper tube partly filled with water and the rest is water vapor. When
>> the bottom is hotter than the top, the water boils in the bottom,
>> condences in the top and rains back down to the bottom. When the top is
>> hotter, noting happens. You can use this to connect and disconnect a top
>> mounted heatsink depending on which is better to do.
>>
>
>*** Hmm, I find this quite difficult to imagine.

http://www.thermocell.co.nz/heatpipes.html

>*** Shutting down the charger? My problem in doing this is I will then need
>to have a separate power supply to power up the main system.

You could have a MOSFET in the charging path to the SLA and shut it off.
This way, the SLA would be able to take over if the power failed but would
not draw charging current when things are hot.

Remember the MOSFET has a substrate diode.


From DC supply-------+-------- To load
!
!!-
-----!! P-MOSFET
!!---- To SLA

You could use an N-MOSFET if you add a higher voltage supply at pratically
zero current.

--
--
kensmith@xxxxxxxxx forging knowledge

.

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