Ok, so we all know that you couldn't possibly be using all that power that your 5.4L Truck, or your 5.9L Van is making, but then where is it going? And how can we reclaim some of it? In this Instructable I will show you how to save electricity, and also be ready in case of an emergency.
Step 1: Supplies
Ok now we will need supplies
-Truck, car, van, riding lawnmower (no, I'm not kidding, some of them actually have 12v sockets!), etc.
-Battery jump starter/ battery booster pack/ rechargeable 12v battery thing (with cable to charge in car)
-12vdc to 120vac power inverter (mine is only 200watts)
-Lights, chargers, other things that use power (must total less that inverter's output, watts=volts x amps)
Total cost should be about $25,000, or only about $15-40 for inverter and jump starter.
Step 2: Charge it up
Next time you go out in your car take the jump starter and plug it in to charge. This is only effective if your commute is over 10 minutes long. When you get somewhere or turn off the engine UNPLUG IT!!! Most cars don't turn off the 12v cigarette-lighter port until it is too late and your battery is dead. If it is, then use the jump starter to start your car, but if you do it will drain it, making all of your efforts wasted.