I am wanting to run an additional line from an available 15V tap on my transformer to my backyard to illuminate 6 small trees. The run would be a little over 150 ft in total with three fixtures at around the 50 ft mark and the other three fixtures at the end around the 150 ft mark. I plan on using 2W bulbs for the fixtures. Would there be a noticeable voltage drop for the three fixtures at the end (key word here being noticeable). Also, what would be the minimum size cable that I could use? Thanks for the help!
More info needed. What size is your transformer, what’s the current total wattage being used, and what length are existing runs?
You should be good. In all, you’ll be using only a hair over a third of the 120W maximum you want to be using (in order to compensate for voltage drop) and your longest run will still be fairly modest. What I would do (to be on the safer side) is connect my new 50 ft run by sharing taps with one of the existing runs and then use the 15V for my 150 ft run. I think 14 gauge could work but there'd be little margin for error if you wanted to add more fixtures or bump up your wattage on that run. Hard to imagine you'd need 10 gauge. Twelve gauge should hit the sweet spot imo and give you plenty of wiggle room. If others don't chime in, I recommend you contact the pros at VOLT customer service for the most informed guidance. HTH
