PROJECTION BOMBING

Step 6 ALT. SET UP: MORE LUMENS / MORE POWER

If you have access to a digital projector with more than 2500 lumens you will need a more powerful AC power inverter. The system shown here uses a 2000 Watt AC power inverter with a 4000 lumen digital projector. This is the projection setup used for Graffiti Analysis, and the projections done by the Graffiti Research Lab.

The only major difference of projecting with more powerful equipment is that you 1) will need more power from your battery and inverter and 2) the connection mechanism between the battery and inverter needs to provide a more reliable connection with a larger surface contact area than an alligator clip. Most auto shops and places that sell car batteries will sell cables made specifically to be hardwired onto car battery terminals (see image below). This allows for a tighter more permanent connection to the battery.

Because I was using rental cars for my projections and did not want to have to continually hardwire connections to the battery I purchased a secondary battery. This battery sits on the floor of the passenger seat and is connected via jumper cables to the cars battery. This makes possible quick on location connections to the battery under the hood while still maintaining a reliable connection from the inverter to the secondary battery. It also allows for more minutes of projection time since you are running two batteries in parralel.This set-up also allows for projection from a moving car.

Disclaimer:
This is the system I use most often and it has worked well for me on every occasion but there are inherent dangers to hooking up a battery. Connecting multiple batteries in parallel can increase this danger and add other complications. Doing so inside a car could cause injury or even death if the battery were to leak, explode or make the NYPD think you are terrorists and shoot you 40 times. Any thoughts on the dangers associated with this process or alternatives are welcome and encouraged.

Step 1:
Place the secondary car battery on the floor in the passenger seat. Put the 2000 Watt inverter on the floor next to the battery. Turn on the car and pop the hood.

Step 2:
Make sure the inverter is turned off and nothing is plugged in. Connect the inverter to the car battery in the front seat. It's the same process as in the previous page only now instead of clipping the connection on you will need to use a 13mm socket wrench to tighten the connection bolts. First connect the positive terminals and then connect the negative. If this was done properly and there is still some charge left in the battery you should get a green light when you power on the inverter. After testing make sure to leave the inverter in the off position.

Step 3:
Use the jumper cables to connect the cars battery to the battery on the floor in the passenger seat. Make the connections in the same order as you would to jump a dead car battery:

• Connect the red-handled/positive jumper cable clip to the positive terminal (the one with the plus sign) of the cars battery.
• Connect the other red-handled clip to the positive terminal of the battery in the passenger seat.
• Connect the neighboring black/negative clip to the negative terminal of the battery in the passenger seat (the one with the minus sign).
• Connect the black/negative clip to the negative terminal of the battery. You could also try to connect the negative alligator clip to the chasis ground of the car, this may also work and can cut-down on the risks associated with arching caused by connecting batteries.

Step 4:
Turn the power switch of the inverter to the on position, if it shows a green light then plug in the digital projector and you should be good to go. All the setup and warnings from the previous page apply here in the same way.