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by Joff
Sun Sep 22, 2019 7:40 pm
Forum: Technical BMW i3 Discussions
Topic: DIY HV Battery upgrade
Replies: 23
Views: 4585

Re: DIY HV Battery upgrade

The main reason I was lookin into this, was that there was a 94ah HV battery for $5000 for sale Another seller was selling the individual 48v modules for 800$ each , which is still less than the 7 to 9k these used 60 ah and 94ah batteries are listed at on ebay. They don't seem to be actually selling...
by Joff
Sat Aug 31, 2019 1:53 pm
Forum: Technical BMW i3 Discussions
Topic: DIY HV Battery upgrade
Replies: 23
Views: 4585

Re: DIY HV Battery upgrade

I figure time to full charge and distance to go are calculated, as those numbers will change as battery holds less Ah over time. I would be ok if got the extra range but it told me I have the standard range. It might trigger some sort of error if the charging system registers a given number of kwh g...
by Joff
Thu Aug 29, 2019 6:54 pm
Forum: Technical BMW i3 Discussions
Topic: DIY HV Battery upgrade
Replies: 23
Views: 4585

Re: DIY HV Battery upgrade

My understanding of a typical lithium bms is that overcharging is prevented by limiting the cell max voltage and tapering off the charge current as full charge is approached. It shouldn't have to keep track of how many watt hours have gone in as long as the voltage and temperature remains within spe...
by Joff
Mon Aug 26, 2019 2:38 pm
Forum: Technical BMW i3 Discussions
Topic: DIY HV Battery upgrade
Replies: 23
Views: 4585

DIY HV Battery upgrade

We know BMW can swap out a 60ah pack for a 92 ah pack and make it work. There is a lot more to it than just removing one and installing the other. The vin number of the new part has to be entered, among other things. As far as I can tell, no one has done it without BMW help. What you you think would...
by Joff
Sun Aug 25, 2019 7:28 pm
Forum: Technical BMW i3 Discussions
Topic: Tire pressure and miles per Kwh
Replies: 9
Views: 2915

Re: Tire pressure and miles per Kwh

an impact puts more stress on the wheel and suspension if the pressure is higher. Well that sounds reasonable, but it is only true if the tire never "bottoms out" Hit a big enough pothole, and low profile tires absolutely will. All photos of i3 rim and tire damage from potholes that I have seen, sh...
by Joff
Wed May 15, 2019 5:12 pm
Forum: Suggestions for BMW
Topic: Make REX start optional .
Replies: 5
Views: 5267

Re: Make REX start optional .

Seems like a reasonable request that wouldn't be hard for BMW to fulfill. a BEV will let you drive down to 0 miles range, no reason a rex could not. The person who paid for the car should get some say in the matter. Sometimes they are not idiots and they happen to know more about where that car is g...
by Joff
Wed Apr 24, 2019 5:50 pm
Forum: BMW i3 Rex Specific Discussions
Topic: REX output
Replies: 8
Views: 3765

Re: REX output

I am curious what the output of the rex generator is. AC? DC? Does it match the voltage of the battery or is it converted somewhere else? The I01 High-voltage Components manual describes the REx operation and its specs. Wow! What a huge in depth source of info, That will keep me learning for a long...
by Joff
Tue Apr 23, 2019 7:59 pm
Forum: BMW i3 Rex Specific Discussions
Topic: REX output
Replies: 8
Views: 3765

Re: REX output

I am curious what the output of the rex generator is. AC? DC? Does it match the voltage of the battery or is it converted somewhere else?
by Joff
Fri Apr 05, 2019 2:50 pm
Forum: Technical BMW i3 Discussions
Topic: Tire pressure and miles per Kwh
Replies: 9
Views: 2915

Re: Tire pressure and miles per Kwh

I raised my tire pressure up 10 psi higher than the spec. I haven't done the most scientific of comparisons yet, but I have gotten the highest miles per Kwh that I ever got. 9.3 mi/kwh according the bmw connected app. I think around 6 was my best before and my average (not trying to conserve amps) i...
by Joff
Tue Apr 02, 2019 7:01 pm
Forum: Technical BMW i3 Discussions
Topic: Management of Battery Life
Replies: 16
Views: 3963

Re: Management of Battery Life

"Cycling the battery in the middle, avoiding too high or too low voltage, significantly improves longevity of li-ion batteries." Absolutely ! That is why BMW has set up the i3 to neither fully charge, nor fully deplete it's battery. when your i3 tells you the battery is at 100% the cells in the batt...

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