Tagged Questions

1
vote
1answer
75 views

Spec'ing an always-on alarm/tracker for a car battery

What is the specification of a standard car battery (e.g. of a 2008 Jetta)? Say, I want to connect an always-on alarm or a tracker to the electrical system of the car. Is it likely to deplete the ...
2
votes
2answers
141 views

What is the proper name or part number of a 12V DC female car adapter with leads?

I've searched hobby sites like SparkFun, Digikey, BGMicro, and Jameco. I'm starting to wonder if I'm calling this item by the wrong name. What I'm looking for, exactly, is a 12V female car adapter ...
2
votes
1answer
178 views

How to measure the car battery charge with good precision

My goal is to replace the analog battery gauge in the dashboard - with a more accurate, digital gauge. My first idea was to look for a specialized IC. I'm familiar with battery gauges for LiPo ...
2
votes
1answer
1k views

Why is there risk of overvoltage when jump-starting a vehicle?

Ford Focus C-Max manual describes jump-starting procedure as follows: shut off everything, connect the jump cables, start the donor vehicle engine and let it run for a while, turn the ignition key on ...
-1
votes
1answer
129 views

I am thinking of designing an electric car and am wondering about the best way to drive the wheels

I'm thinking of a light cart - barely enough room for one person and the batteries. What do you think would give me the best battery life? I am thinking a (brushless?) motor with the input voltage ...
5
votes
2answers
249 views

what does “70A moy/arit 90A eff” on a high-current automotive lead-acid battery charger mean?

I have a huge (28 kg mass) automotive high-current battery charger, and its current delivering capabilities are described like that: 70A moy/arit 90A eff What do ...
10
votes
3answers
1k views

Extra negative battery cable when charging outside car?

If you go to: http://www.battery-chargers.com/charging_instructions.htm ...Under "Operating Instructions" part "B: Charging battery outside of vehicle", it says you have to attach an extra jumper ...