One solution of several would be....
Bosch and Delco and probably a few others make a "Series Parallel" switch which would allow you to run your domestic batteries as 12 volt and switch to 24 for emerg start.
http://www.genr8.net.au/uploads/file/47.pdf
BCL and probably others make a 24 volt powered 12volt charger
http://www.gsl.com.au/tl_files/pdf-a...BC2412%27s.pdf




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