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by alohart
Sat Nov 29, 2014 12:04 pm
Forum: Technical BMW i3 Discussions
Topic: Where does the headlight power come from?
Replies: 42
Views: 22954

Re: Where does the headlight power come from?

The converter is far more complicated than "being turned on and off as necessary" or operating like an ICE car with a simple regulator circuit. There's a bunch of SW running in a controller in there, it'll be far more complex than you've described. Of course, but since none of us has the source cod...
by alohart
Sat Nov 29, 2014 2:34 am
Forum: Technical BMW i3 Discussions
Topic: Where does the headlight power come from?
Replies: 42
Views: 22954

Re: Where does the headlight power come from?

I think however that far more than 90% of 12V power comes directly from the DC-DC without touching the 12V battery. I would be surprised if this is true. Without a wiring diagram, I'm guessing that the 12 v. battery is always connected to the 12 v. circuit as in all cars. The DC-DC converter serves...
by alohart
Sat Nov 29, 2014 2:17 am
Forum: Technical BMW i3 Discussions
Topic: Where does the headlight power come from?
Replies: 42
Views: 22954

Re: Where does the headlight power come from?

The converter requires nothing on the low voltage side to operate. If true, then the connection from high voltage circuit through the DC-DC converter to the 12 v. circuit must be always exist which I doubt. If it works like my Honda hybrid, a 12 v. relay closes when the Start/Stop button is pressed...
by alohart
Fri Nov 28, 2014 7:27 pm
Forum: Technical BMW i3 Discussions
Topic: Where does the headlight power come from?
Replies: 42
Views: 22954

Re: Where does the headlight power come from?

The 12V battery is tiny in an i3, only 20 Ah AFAIK, much smaller than in an ICE. It would in principle be possible to eliminate the 12V battery altogether, but this is needed for some tasks like backup for emergency lighting in case of a 360V failure. In practice, it's probably not possible to elim...
by alohart
Thu Nov 27, 2014 2:03 pm
Forum: General / Main i3 Owners Forum
Topic: Pathetic charging of i3 compared to B Class Electric
Replies: 50
Views: 21806

Re: Pathetic charging of i3 compared to B Class Electric

I hope BMW will give us an option soon in the car and the app so we can do something like "charge to 80%", "only charge during these hours" and maybe more than one range of allowed charging times. Yes!! It will get old walking 200 feet and down 2 floors to reach our parking space so that I can begi...
by alohart
Thu Nov 27, 2014 1:46 pm
Forum: General / Main i3 Owners Forum
Topic: Range Indicator
Replies: 8
Views: 4772

Re: Range Indicator

I figured it might have also adapted to the driving style of people test driving it. This is why I was wondering if I could do some sort of a reset so I can gauge and practice efficient ev techniques. I doubt that we know the algorithm used to calculate remaining range, but it almost certainly incl...
by alohart
Tue Nov 25, 2014 4:44 pm
Forum: News and Main BMW i3 Forum Discussions
Topic: Wheel and Tire Replacement
Replies: 5
Views: 3407

Re: Wheel and Tire Replacement

BTW, a higher profile tire does not always mean a wider tire....... But on the same 19" diameter wheel, it would mean a larger tire diameter which would affect the speedometer/odometer accuracy. Although with the i3's speedometer/odometer reading a bit fast/far, a slightly larger tire diameter coul...
by alohart
Tue Nov 25, 2014 11:38 am
Forum: Modifications & Accessories
Topic: getting new wheels, looking for opinions
Replies: 19
Views: 12458

Re: getting new wheels, looking for opinions

I like the S|3 RSF1 shown in the upper right corner of the gallery . Its blue hardware and gloss black trim would complement the i3's blue trim and gloss black hood and hatch. However, 7.5" appears to be the narrowest wheel offered. The i3's tires must be too narrow for wheels that wide, so what tir...
by alohart
Sun Nov 23, 2014 5:52 pm
Forum: Problems / Troubleshooting
Topic: Low cost charging - not delaying
Replies: 5
Views: 3606

Re: Low cost charging - not delaying

Is it not possible to use the low cost charge window to limit the charging time regardless of the starting and ending charge levels? I.e., is it not possible to charge for only 3 hours total by setting a 3-hour low cost charge window? I don't want to routinely charge to 100%. I typically want to cha...
by alohart
Sun Nov 23, 2014 5:38 pm
Forum: General / Main i3 Owners Forum
Topic: Cold weather
Replies: 14
Views: 7864

Re: Cold weather

What I have realized is that close to 80 miles (w/e the car maxes out to) the charge slows down... also monitored the charge using Chargenow station/ app and graph kinda falls from actual usage to 10% value when battery reaches max charge (or so).... whats confusing me is the actual range appearing...

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