christopherjfrank
Posts: 6
Joined: Thu Mar 01, 2018 4:14 pm

Hurricane power?

Thu Sep 13, 2018 2:02 pm

Preparing for Florence and possible power outage:

SO if I plug my little inverter into the lighter to grind my coffee beans, etc., does it draw from the 12 volt or the main battery pack?

i3Houston
Posts: 58
Joined: Thu Jul 12, 2018 2:30 pm

Re: Hurricane power?

Thu Sep 13, 2018 2:40 pm

I think 12V
TM3 Reservation holder/ 2015 i3 Rex

CharonPDX
Posts: 20
Joined: Sat Jul 21, 2018 8:54 pm

Re: Hurricane power?

Thu Sep 13, 2018 3:30 pm

12V, but if you leave the car "on" it will keep 12V "topped off" from HV.

christopherjfrank
Posts: 6
Joined: Thu Mar 01, 2018 4:14 pm

Re: Hurricane power?

Thu Sep 13, 2018 5:50 pm

OK......so how can I leave the car on without sitting in it? It shuts off automatically if you get out.....

jadnashuanh
Posts: 4035
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Hurricane power?

Thu Sep 13, 2018 6:24 pm

The 12vdc socket isn't all that high powered. But, if you turn the car on and exit via the passenger's door, it doesn't shut down until the main battery dies. You could use it to recharge your phone.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

alohart
Posts: 1350
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: Hurricane power?

Thu Sep 13, 2018 8:57 pm

jadnashuanh wrote:But, if you turn the car on and exit via the passenger's door, it doesn't shut down until the main battery dies.

If you have the daytime running lights set to be on in iDrive, you might set them to be off to minimize the 12 V load.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

CharonPDX
Posts: 20
Joined: Sat Jul 21, 2018 8:54 pm

Re: Hurricane power?

Thu Sep 13, 2018 11:33 pm

Good suggestions from others - get out passengers' side, turn off DRLs.

One other is that the cigarette lighter outlet under the center armrest has the highest-power fuse, although it's still not a ton - 140 Watts total for all three 12V sockets.

You could also tap in to the 12V directly through the fusebox in the passenger footwell, or even directly to the battery in the frunk, which could get you up to 500W continuous power.

alohart
Posts: 1350
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: Hurricane power?

Fri Sep 14, 2018 1:24 pm

CharonPDX wrote:You could also tap in to the 12V directly through the fusebox in the passenger footwell, or even directly to the battery in the frunk, which could get you up to 500W continuous power.

Probably the best and easiest place to connect to the 12 V system directly is under the floor of the rear cargo compartment. These official instructions on charging the 12 V battery show the 12 V terminals. These terminals are almost certainly not protected by a fuse. One would need to limit the power consumed so that the output capacity of the DC-DC converter that charges the 12 V battery would not be exceeded. I don't know the output capacity.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

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