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Old 09-29-2017, 05:41 PM   #241 (permalink)
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Great thread! And sorry for the resurrection.

I am looking at some honda CRZ's (from 2011-2012) and will inevitably run to the battery problems if i purchase the car.

Is the information in this thread still valid or have the solutions proven to be only temporary and not worth the time and expense.

For constant charging would something like this be any good?
Boost converter with 12v input and adjustable voltage output (200mA max)
High Voltage DC DC Boost Converter 8 32V 12V to +/ 45V 390V ZVS Capacitor Charging-in Inverters & Converters from Home Improvement on Aliexpress.com | Alibaba Group


Also if you install the leads, could you not stick more batteries in the trunk and have 160V with a diode and 10A max. Would this improve FE?

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Old 09-29-2017, 05:58 PM   #242 (permalink)
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Not sure. I know I've commented in this thread, but I can't say what's still valid and what's not. What I can say is that little, if any, applies to the CRZ.

CRZ and G2 Insight batteries are a different design than their predecessors (though not necessarily compatible with one another - maybe, but I don't know). They have had substantially better reliability.

If you could set the output of that device to about 118V, it would be useful for maintaining about 70-80% average SoC. I assume your goal is to charge the battery with a 12V source?

The fan is PWM controlled. You would need to make provisions for driving the fan while charging.

I can't envision your proposed "more batteries," 160V/diode/10A solution. The battery management system does not permit increases in voltage.

The FE gain from any modification associated with expanded battery capacity is unlikely to be advantageous due to the added weight.

Last edited by S Keith; 09-29-2017 at 06:03 PM..
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Old 09-30-2017, 08:25 AM   #243 (permalink)
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Yes, i would like to use 12V.

There is not really a high power need for the batteries if it is only 350mA. And this gizmo is able to supply 200mA.

6500 mAh / 200mA = 32.5 hours to full charge if battery is completely depleted. But in general i doubt that would be the case.
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Old 09-30-2017, 02:26 PM   #244 (permalink)
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Older Honda hybrid batteries (G1 Insight, HCH) die because they have insufficient cooling due to poor airflow and low fan duty cycle, and they operate in a wide SoC window instead of a narrow band.

The Panasonic cells Honda used are actually very good, they're just abused by the terrible BCM letting them work too hard and temperature fluctuations.
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Old 09-30-2017, 06:56 PM   #245 (permalink)
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Quote:
Originally Posted by teoman View Post
Yes, i would like to use 12V.

There is not really a high power need for the batteries if it is only 350mA. And this gizmo is able to supply 200mA.

6500 mAh / 200mA = 32.5 hours to full charge if battery is completely depleted. But in general i doubt that would be the case.
If your goal is to "grid charge" the battery w/200mA current off a 12V power source, then that device appears to be sufficient; however, you must provide PWM control of the battery fan during charging. 200mA may not seem like much, but it's enough to overheat cells in their insulated case even at 200mA.

If your goal is to somehow improve efficiency during driving by charging while driving, then no, it's not worthwhile.

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