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<forehead SLAP>GOSH I wished I'd thought of that!!
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Collaborative solutions. That's why we are here.
I love it because it's plug and play. I was expecting a lot of wiring, relays switches and voltage monitoring. Now all I have to do is charge and go. It's partner friendly!
Incidentally this happened by accident. I was supposed to disconnect the DC-DC converter but I forgot. I realized later while we were driving. When I checked the 12V (for easy SCO reference) battery and it showed 11.5 volts under load, I kind of freaked because I thought I had fried the DC-DC with the 14.7 volts. I thought it should read 13.8V. I later tested it by disconnecting the 14V battery and everything worked fine. I then realized that the 12V battery would not read 13.8V with the DC-DC on because of the extra cell. WHEW!
What are the voltage / SOC numbers for those Prius modules? They have a tighter band don't they? I wonder what their SOC will be when they hit 13.8V.
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Your extra cell on the Pb battery is a brilliant solution.
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Thanks but it's half mine and half Darin who suggested tapping a battery with a screw to tap single cells. I then used this idea to charge one low cell on one of my 12v deep cycles which made me think of salvaging the broken one and tapping/adding one cell.
The one hitch here is the charging. I have a charger that will do the trick slowly but it may not have enough juice to really finish the charge. I still have to test this. Otherwise I will need a 14V battery charger. I wonder if there is any way to adjust an existing charger. Some have pots inside to trim the peak voltage. Hmmm.
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My only concern had been whether or not the inverter voltage control would 'suck' electrons out of a higher voltage battery. Have you tried using a current sense resistor to see if there is any reverse flow into the inverter? That will be my first test. <grins>
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No. Didn't check this. Don't have any simple way. I guess could install an ammeter. I guess a big diode would solve that if it was back feeding. I don't know enough about electronics to even guess.
I still have to test the FE savings but that will be a simple matter.