tag:blogger.com,1999:blog-2270124316233555550.post4505372911374099548..comments2023-01-26T20:59:29.216-08:00Comments on Porsche 914 EV Conversion: Initial CCPower SchematicTimKhttp://www.blogger.com/profile/09059780797709299125noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-2270124316233555550.post-24463009823487716062007-09-06T21:33:00.000-07:002007-09-06T21:33:00.000-07:00Thanks for all your suggestions. I've given the s...Thanks for all your suggestions. I've given the schematic to several power-supply designers at work to look at and think about. They were most helpful in suggesting things to look at.<BR/><BR/>I also sent an e-mail to CCPower earlier today, so perhaps they'll respond by the morning (they're in the UK)<BR/><BR/>The standard-plate lead-acid batteries I'm using sag quite a bit under heavy acceleration and return to their initial voltage after coasting a bit. I'll have to contact Viktor about the ultra-capacitor. The car drives OK now, especially with the pack getting more broken in. I just don't like having a blown DC-DC. Ideally, I should be able to short the DC-DC out and it should current limit without dying...TimKhttps://www.blogger.com/profile/09059780797709299125noreply@blogger.comtag:blogger.com,1999:blog-2270124316233555550.post-5206330540815476902007-09-06T21:13:00.000-07:002007-09-06T21:13:00.000-07:00Hi Tim,I remember that you said the Battery Pack v...Hi Tim,<BR/>I remember that you said the Battery Pack voltage sags under load.<BR/> The DC-DC converter has an ideal ratio of Pack Voltage to Low Voltage of ~ 10 : 1<BR/> You also commented that you had to adjust the inverter parameters because of the Battery Pack voltage sag.<BR/> When you add the reduced Battery Pack voltage supplied to the DC-DC converter to a possible voltage sag at the Low voltage side then, when the headlights come on, it seems to me that you don't have much run-time left in your car. At least, not with the CC Power converter.<BR/> I would suggest contacting Viktor and see if his idea about putting an ultra capacitor bank in parallel with the Battery Pack might give you more run-time between charges.Bobhttps://www.blogger.com/profile/12820257765010692619noreply@blogger.comtag:blogger.com,1999:blog-2270124316233555550.post-28977466196976034542007-09-06T02:34:00.000-07:002007-09-06T02:34:00.000-07:00What does the manufacturer say?What does the manufacturer say?pjorghttps://www.blogger.com/profile/05718551762425737475noreply@blogger.comtag:blogger.com,1999:blog-2270124316233555550.post-74591784701578979962007-09-05T11:12:00.000-07:002007-09-05T11:12:00.000-07:00Tim, if you haven't done so already, why don't you...Tim, if you haven't done so already, why don't you post this on the EV discussion list. There are some pretty deep thinkers there.<BR/>/rogerRoger Daisleyhttps://www.blogger.com/profile/10752698755981213856noreply@blogger.com