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Batteries (again) - 2 Main Batts plus Tail Fin Batt wiring/switching
Hi,
Time to dust off a perennial topic I looked through the archives and read Darryl Ramm's battery presentation. Not an exhaustive search but I didn't find an answer to my question. At present we have two (fused) 12V 7Ah "main batteries" connected to the Master switch via an SPDT "changeover" switch. We are adding a smaller capacity tail fin battery as a "reserve". Without using diode switching and keeping it as simple as possible for multiple club pilots, I can see 3 possibilities that I've illustrated he http://www.avon-tech-solutions.co.nz...derBattery.pdf - select 1 of the three batteries using two SPDT "changeover" switches in "series" - separately isolate the tail battery in parallel to the currently selected master - separately isolate the tail battery in parallel to the master switch Each has its advantages and disadvantages. No doubt there are more possibilities. I expect to add the recommended Volkslogger "hold up" circuit separately (or power the logger and possibly a PDA from a dedicated battery, much like the self contained battery/logger systems previously discussed here on r.a.s.). What wiring / switching schemes are you using for this 3 battery arrangement? Thanks for your suggestions. Neil |
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Batteries (again) - 2 Main Batts plus Tail Fin Batt wiring/switching
Schleicher uses a rotary switch
Batt 1, Batt 2, Batt 3, Off. If you can get one of these, it reduces to one switch. -- Hartley Falbaum "Neil Allison" wrote in message ... Hi, Time to dust off a perennial topic I looked through the archives and read Darryl Ramm's battery presentation. Not an exhaustive search but I didn't find an answer to my question. At present we have two (fused) 12V 7Ah "main batteries" connected to the Master switch via an SPDT "changeover" switch. We are adding a smaller capacity tail fin battery as a "reserve". Without using diode switching and keeping it as simple as possible for multiple club pilots, I can see 3 possibilities that I've illustrated he http://www.avon-tech-solutions.co.nz...derBattery.pdf - select 1 of the three batteries using two SPDT "changeover" switches in "series" - separately isolate the tail battery in parallel to the currently selected master - separately isolate the tail battery in parallel to the master switch Each has its advantages and disadvantages. No doubt there are more possibilities. I expect to add the recommended Volkslogger "hold up" circuit separately (or power the logger and possibly a PDA from a dedicated battery, much like the self contained battery/logger systems previously discussed here on r.a.s.). What wiring / switching schemes are you using for this 3 battery arrangement? Thanks for your suggestions. Neil |
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Batteries (again) - 2 Main Batts plus Tail Fin Batt wiring/switching
HL Falbaum wrote:
Schleicher uses a rotary switch Batt 1, Batt 2, Batt 3, Off. If you can get one of these, it reduces to one switch. I just checked the Maplins online catalog (Maplins is the UK equivalent of Radio Shack) for their standard range of panel mount rotary switches. These are 1,2,3 and 4 pole types (12,6,4 and 3 positions). They have a movable stop so you can blank off unwanted positions. Something like these is available pretty much anywhere. They are rated at up to 5 amps, so should be OK in a glider panel. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
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