I am working on figuring out a megatree and using the e681 or 2 e681's depending on pixel density using GECEs. I have 25 ct GECEs and the OEM adapter is rated at 1.2A out to the string. I have some PC power supplies that can output 30A at +5v.
For maximum usage of an e681, I am planning on using as close to 680 pixels as possible. This would come out to a maximum total of 27 sets of 25 pixels. 27 sets @ 1.2 A would total 32.4 A. Would a PC power supply rated at 30A work for this? I assume there is overhead built into the OEM GE adapter.
How easy is it to enclose the PC power supply since it has a fan? I don't know if moisture would be an issue - possibly have the enclosure open at the bottom?
When attaching GECE sets to lengthen the strand, is the end bulb pretty much useless since you cannot solder directly onto the PCB? Is there a maximum length or number of pixels per string that the signal or power degrades too much and causes dimmer or unresponsive bulbs? Is it possible to only splice the data wire at each break of 25 bulbs and solder in a power supply to power the next 25 bulbs? It looks like I will have a maximum of 42 pixels per string. There are other areas of my display where a continuous run would be beneficial resulting in about 100 pixels for a string if possible.