I was thinking solar plus LiFePO4 plus 4 of these:
EV-Power | Cell Balancing Module (3.60V- 1.7A)
That (top balancing the cells) should keep it in check. As a bonus, it will also top balance the cells when the alternator is running 
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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