I have no idea if OVMS has any part to play other than in reporting the issue, but I've posted a full description to speakev at https://speakev.com/threads/12v-battery-flat.2373/

Basically I hit a low voltage warning - OVMS notified me via text.

 - why at such a low threshold when it was too late

 - no idea yet if ovms may be causing more drain

the rest of the info is on the thread

nigel.
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Nigel Jones