Battery connectors in Schleicher gliders

Thanks for that, Larry: caused me to go and do some reading, and most
interesting it was too.

It looks like the type I quoted would be fine for our purposes (in
series with a 7 AH 12v gel cell). Its a general purpose type. The
hold current is 5 amps at 20C reducing to 2.4 A at 85C. Minimum trip
level 8.5 amps at 20C, trip time 2 secs at 25 A. Untripped resistance
0.017 ohms. This type would appear to be suitable for the type of load
we apply in a glider.

It also looks like the temperature environment is fine if we mount the
device on the battery and install the combination in the cockpit.


On Tue, 03 Aug 2004 03:27:15 GMT, Larry Goddard
wrote:

These resettable fuses are good devices. I use them in the ::Goddard:: power
supply units that we manufacture.

Look closely at the specs because they have an ambiguous range in their
behavior. You will normally find two specifications rather than one such as "5
amp" on fuses. These units will have 'guaranteed break' and 'guaranteed hold'
ratings. For instance, the guaranteed break point might be 5 amps, but the
guaranteed hold would be only 3 amps. In between these two points the condition
is ambiguous... might be "on" and might be "off". So pick a device where the
"guaranteed hold" rating is a somewhat above the minimum required. then you
should be fine.

Larry Goddard
"01" Zero One
USA



Martin Gregorie wrote:

On Mon, 02 Aug 2004 21:26:57 +1000, Graeme Cant
wrote:

Martin Gregorie wrote:

Put spade connectors on the battery connected to the XLR inline socket
by a short length of mains cable and while you're on the job fit a
self-resetting fuse in the positive line. These are inexpensive solid
state devices that go open circuit if overloaded and turn back on
after 30 seconds or so.

My batteries are set up as you describe but I use spade connector auto
fuses. Can you give a make/model or URL for those self-resetting fuses
you mention?

RS Components Cat No 283-8784. This is rated for 5A fuse and 16v, cost
£0.854 each. Orders must be multiples of 5.

I'm actually using a blue rectangular unit with the part number
AN2-5A. These were fitted when I bought the glider. I've run web
searches, but can't identify the brand or a source for them. I believe
they have a similar rating to the RS part.


--
martin@ : Martin Gregorie
gregorie : Harlow, UK
demon :
co : Zappa fan & glider pilot
uk :

--
martin@ : Martin Gregorie
gregorie : Harlow, UK
demon :
co : Zappa fan & glider pilot
uk :