I measured typical running draw at 14A on the TSX some time ago. That would give me about 20 min before the alternator kicks on using my 5aH battery. That discharge curve looks just about right for the alternator to kick on. I'd want it to leave about 20% charge just to prolong battery longevity. I'll have to test this out and see how low my battery goes before the alternator kicks in. Unfortunately I expect to be running about 3C discharge.
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