As the car removes most of its mechanical parts (e.g motor), there are less parts under the hood, so I don’t want to keep the battery over there, it’s heavy anyway. Also, there is no generator so the battery is not charged over time and I don’t want to remove it or attach the external charger from time to time. I decided to find a way to power up the car without the battery.

The engineer said that, the power supply with 12V and somehow 50A is very expensive and the car  can draw upto 50A when it starts, so I should think about the charging method. I don’t think so. I decided to get a Cooler Master power supply (for your computer, yes it is) the V1200 which can provide upto 100A in 12V rails. It’s far than enough.

However, when I connected to the car and start the car, the power supply shutdown immediately (because of the overload, I guess). So, the car draws much more than just 100A or maybe because there is no load on 5V rails [1], so it’s unbalanced and shutdown. But hey, that PS is Haswell ready, so we don’t need to have load on 5V rails to get it working. There are guys showed that they can even start their cars by a much worse PS with 500W [2], so I believe that there should be a way. To power up the PS without a mainboard, it’s very easy, just jump the PS_ON line to any of GND line. However, with this modular CM V1200, you need a bit more, see below.

I think again and try to connect both battery and power supply to the car, start the car, then remove the battery and let’s the power supply power up the car for normal use because I don’t think that the normal use of the car can draw more than 100A. Yeah, it works like that.

Now, I need a jump start helper, I think about the battery bank like the Anker one [3]. If it works good, then I can connect the 5V rails to the input of Anker so it is always full of charge and can be used to start up the car. It’s a light weigh solution and I can just only connect the power cable to the power supply. I will come back here when the Anker come.

To make the cable short, I don’t want to plug in the long thick cables that comes to mainboard, I want a short jumper. Look on the mainboard cable, there are 3 important pair rails that connected together, it is 12V, 5V and 3.3V. Looks for those pairs on the PS and short jump it. Just connect them and yeah!

[1] http://reprap.org/wiki/PC_Power_Supply

[2] https://www.youtube.com/watch?v=jNbBKD61lf8

[3] https://www.amazon.de/Anker-Starthilfe-Spitzenstrom-Sicherheitsschutz-Taschenlampe/dp/B011KI510Y/ref=sr_1_1?ie=UTF8&qid=1481877891&sr=8-1-spons&keywords=anker+starthilfe&psc=1