I am looking to drive 32 strings 12v @ 50 nodes each (1600 total 12v nodes) megatree from one F16v3 board. My plan was to use 2 strings (total 100 nodes) per port for 16 ports total. For now, let's assume worst-case scenario of 100% brightness/white which leaves me with a power requirement of 1152 total watts and 96 amps per the megatree calculator. My plan was to power this from 4 350W Meanwells OR 2 750 HP server PSUs.

The F16v3 is only rated for 30amps per bank (8 ports per bank) so 60amps total.

My realization is that I must power inject to remove the load from the board. So I have inadvertently designed the opposite of what I wanted to do :)

Assuming no changes to the design or brightness and not using another expansion board - is the best approach to send data only from 16 ports on the F16v3 and drive power to the 16 strings through 4 F8-Distro power distribution boards? The F8s are rated at 30 amps each. So 4 F8-Distro gives me 120amp total (I can't use 2 or 3 boards because I would exceed the 30 amp per board limit and not give me the 96 amps I need). I would run 4x, 100-node strings from each of the 4 F8-Distro boards at 6amps per string gives me 24amps per F8-distro board.

Is this the best approach or is there a more elegant solution?

If this is the recommended approach would I just bring the data line from the 16 F16v3 ports to each of the strings? Do I need to worry about making a circuit or loop for data or does this not matter? ]]>

I'm trying to add parallel catenary lines of medium-base bistro lights under my 9' x 21' patio, that during part of the year will have clear bulbs and at Christmas time will be colored.

I need about 100' of medium-base bulk cable, which I found on a site. However due to the spacing between the parallel lines of lights I likely need to vary the spacing.

Is it advisable to splice other wire between the parallel lines of lights, such that all 11 lines are electrically in parallel? Are there preferred ways of doing this to make sure it is water resistant? (I have done some house wiring before but am not sure what the norms are for this type of installation).

Thanks for any suggestions you can provide!

Shawn ]]>

One-way wire length: 30'

Amps: 3A

Wire: 16AWG

http://wiresizecalculator.net/calcul...oltagedrop.htm

Voltage Drop:0.9V

https://www.calculator.net/voltage-d...feet&eres=3

Voltage Drop: 0.72V

It seems the first link is using the formula:

2 * K * L * I / Cm

K = ohms-cmil per ft - 12.9 for copper

I = current (or amperes) of load

L = length of conductor in ft. (one-way)

cmil = circular mil area of the conductor

https://www.rpc.com.au/pdf/Wire_Chart.pdf

Whereas the second is using: 2 * L * I * R / A

L = one-way length

I = amps

R = resistance of cable - 0.017 for copper

A = cross sectional area of cable in (mm˛)

http://www.adamselectric.coop/wp-con...ltage-Drop.pdf

What formula is correct in the context of pixels and this hobby?

Thanks,

- pc ]]>