I had that crazy idea in my mind for last few days and i decided to go forward with that.
When i choose dthe projector case, i knew that i would add things and that i would need some room left inside.
The case is from goldenstarlaser and is the H-RGB1800 with rounded sides
The integrated added features are:
-11Ah 13.2V Lithium Phosphate diy battery with BMS
-150W inverter and 120V outlet for powering things like laptop or other low power show acessories
-a stereo 160W amplifier powewred by the battery too ( the inverter too is )
So i'll be able to make some great show projections indoor or outdoor and will only need to cary the projector and a laptop.. or even a smarthphone !
I have made the battery with dissassembled Dewalt 18V Li-Ion battery ( 4 groups of 10x 1.1Ah cells in parallel each ( same 18650 format as the laptop)and then all connected in serie. These cells can deliver up to 60 times their rated capacity in current ( 11Ah = 660A for short term and 330A continuous).. Yes 330A!.. but the choice of these cells was not for their power, but for their large tolerance at low temperature and for long period storage and also their stable and safe chemistry. I'm using a 30A 4s BMS that equalize them and protect them.
The 150W inverter is small enough to fit under the top cover, just like the battery are and is connected to the battery. The inverter output is divided in two, one for psu of the 3 lasers, dac and galvo and another for the 120V outlet on the back panel ( for connecting the laptop)
There is a DPDT switch on the back panel that will select wich 120V power is supplying the laser show components ( the inverter output or the main oem 120V input of the projector)
The amplifier is an ultra compact dual 80W class D high efficiency circuit that require about 35V DC to operate. I added a 150W Boost converter to raise the 12V voltage of battery to get 35V DC to supply the ampifier input. It's a single rail.
I will also add a 1/8 stereo jack on the back panel for the audio signal from the laptop hearphone output and 4 banana plug for the speaker signal output.
The OEM sensivity knob of the audio mic is useless for me so i will replace it by a stereo pot to adjust the amplifier level rater than have to play with the unprecise touchpad of my laptop.
The goal of all that advanture is to be able to cary that great projector everywhere i want to be able to quickly make a laser show with music. and have fun with friends, familly or for the public during party occasions.
I have 2 great compact 2way outdoor speakers from Northen Audio that have great dispersion.
I measured the power consumption o fthe laser projector and it's about 40W average at the inverter 12V input with the galvo at 30K and 3 lasers and the amplifier should draw average 80W so i should be able to get about 1hour of non stop show with music or 3 hours without the built i audio used.
I have couples of holes to drill and file on the back panel for the switch and wiring to finish and i should be able to get it 100% completed for the weekend.
I will post pics as well !
Update 3 Feb 2013
Doc