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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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