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Originally Posted by orange4boy
Exciting news!
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Hooked up my 50A switch mode battery charger to the 12V battery and set it to 50A. ~ 14.5V Codes and triangle remained. Cleared codes with Graham scanner  ... turned off car and started again... Ran fine, no codes, no triangle.
Running load showed a little less than 20 amps. I tried fans and lights and some other loads which added to that but not as much as my van. Apparently they have designed some pretty efficient electrics in the Prius. I will try to do a detailed study of the loads if there is no other reference.
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Excellent news!
If you get a chance, see what the Graham scanner reports for the traction battery current with and without the inverter 20 A. (14.5 * 20 = 290 W.) A detailed load study is an excellent idea. You wouldn't want the control computers to 'lose their mind' if someone flipped on a high current load, say window defrosters and windshield wipers, at the same time. Probably anything with a fuse greater than the 20 A. would be a good candidate and as well as the brakes (electric accumulator.) You are also in a position to see how low the 12 VDC system can go before obvious codes are throw.
Hummmm, 290/745 ~= ~.39 hp, nominal savings.
GOOD WORK!
LATE THOUGHT:
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. . . I may ultimately need a good 100A DC-DC converter for whichever battery pack I decide to use. Hopefully the voltage is the trigger in which case one simply must keep the supply above x-volts to keep the ECU happy. . . .
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This mode, where the deep discharge battery and charger provides the operating current provides a 'fail safe' with one risk ... over charging the existing AUX battery. I had a generator voltage regulator once fail and the 12 VDC battery got hot enough to emit acidic steam ... an interesting problem.
Bob Wilson