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by Joff
Thu Mar 26, 2020 7:44 am
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

I have the I8 modules ready to test, but no where I need to drive, with the covid 19 shelter in place/ quarantine situation. I'm looking into what to do about the bms. i don't want to spend $1200 on a orion system that can handle 96s. As long as I can keep all the cells balanced, I don't need to wor...
by Joff
Wed Mar 25, 2020 6:04 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

Yes, there is a ton, er, many a cubic foot of unused space! For now I would like to be able to toss it out of the car if it burst into flames, but the longer i play with it the safer it seems. I have not decided if I want to put some of them where the rex would have gone or put them all back further...
by Joff
Mon Mar 23, 2020 3:31 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

I typically can get 10 more miles range than it thinks I can. with a small auxiliary, it's hard to know how much of the range is due to frugal driving and how much is the weather and battery. It took me several days to use it up, doing mainly city driving. In fact, I gave up before running the batte...
by Joff
Mon Mar 23, 2020 3:15 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

Let me know if the link works please! This is the temporary battery that I am already done with https://photos.app.goo.gl/pbChZTe9JR4oZ8xf9
by Joff
Sat Mar 21, 2020 11:26 am
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

I forgot to answer all your questions Art. This 8Ah aux battery is just 40 pounds. temporary plywood frame that keeps the cell packets squoze the way they like. I just have it sitting behind the rear seats, it cant go far. No BMS for balancing for now. If I were to cycle this pack a lot, it would be...
by Joff
Sat Mar 21, 2020 7:39 am
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

I built the auxiliary 8ah 360v battery, wired it in with a fuse and a relay to connect and disconnect it. Couldn't see your photo because of a page not found error (404). Sounds like you made great progress! Are you concerned about your auxiliary battery pack cells overheating when the car requires...
by Joff
Fri Mar 20, 2020 8:39 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

I built the auxiliary 8ah 360v battery, wired it in with a fuse and a relay to connect and disconnect it. It didn't throw any codes. it showed 65 miles on the guessometer range to start with on a full charge. it traveled 82. I have a 2014 bev showing 13.4 kwh max kappa. There is no indication of ext...
by Joff
Wed Mar 18, 2020 1:40 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

I decided to make a quick battery out of cells i already have, just to see what happens, if it throws code, triggers turtle mode or somthing. I used 96 8ah packet cells in series, in two banks of 48 cells with a high amp switch in th middle. They are good for 200 amps but I'm using a 50 amp fuse.
by Joff
Mon Mar 16, 2020 4:34 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

Is the state of charge determined by amp flow? and if so, where is it measuring that? Is it measuring voltage to determine state of charge? I don't know the answer. However, the voltage jumps up and down with the propulsive and regenerative loads. The damped voltage wouldn't vary much with charge l...
by Joff
Mon Mar 16, 2020 3:58 pm
Forum: Technical BMW i3 Discussions
Topic: Parallel HV Battery for added range.
Replies: 17
Views: 1114

Re: Parallel HV Battery for added range.

"Fooling the electronics seems daunting. How would regen and battery pack charging work when the main battery pack has 4 times the capacity of the auxiliary battery pack?" Regardless of the auxiliary battery's capacity, it will follow the voltage of cables attached to the main battery. Although that...

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