Well maybe I can help a little:
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Originally Posted by orange4boy
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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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They have a steeper drop-off but they are essentially a flat line on discharge.
Quote:
Originally Posted by orange4boy
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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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The traditional, off-the-shelf approach is an autotransformer but these can be a little pricy.
Perhaps see if the primary winding is exposed, taking off turns of the primary will increase the output voltage. Usually the secondary is the outer, exposed winding and though adding secondary windings increases output, there usually is not enough space. More of a hack, another approach is using Schottky diodes to cut the forward voltage drop by at least 0.5 V.
Another idea would be to see if the output of the transformer is center tapped with the outer ends feeding two diodes. Use a full-wave bridge fed by the outer windings. This will double the output voltage but risk over charging. Add a power choke to the primary winding to reduce the input voltage to reduce the primary voltage and/or use a light dimmer switch.
Just some ideas.
Bob Wilson