Diy help pls
- Thread starter iliriano6
- Start date
oreo57
Well-known member
BEST to keep under 70V total. Voltage adds in series, so any # of LED's that add to 70V total AT 300mA will work.
1W or 3W makes no difference (within reason) except for how bright and how much heat is generated..You could do 21 ind. LED's at 3.2v..
ect.
IF you are referring to something like this:
http://www.banggood.com/3W-High-Pow...ed-gadget-US&gclid=COvLq-7H5sQCFRSUfgodr4wA2g
70/11 V = 6.36chips in series or 6 easily, 7 OK (11x 7= 77V) , 8 (11 x 8= 88V) is pushing your power supply.
It is normally NOT a good idea to max out a power supply.
ABOVE based on these parameters:
Oh and you need at least 5 to go above the 50V minimum..
Thks
Also I must point out that DC voltage over 50 volts gets into the range where dangerous shock hazard becomes a real issue, especially in a DIY near water, like a turf scrubber. If you use a driver capable of more than 50 volts be absolutely sure you never touch the board or wires or heatsinks when powered up and be equally sure everything is safely wired and sealed up so you can't accidentally touch it, short it to the heatsink, get it wet, etc.........safety first.......
A better driver choice would be using the plain old Meanwell ELN-48 driver (or comparable) and then run your LEDs in serries parrellel. 3 strings of 3 COB LED arrays. Set the driver to output around 600 to 750mA.
You should run those COB arrays at currents below their rated 300mA anyway as they look to be 3 rows of diodes wired in parallel internally, so pushing them to max is asking for them to burn out........
A better driver choice would be using the plain old Meanwell ELN-48 driver (or comparable) and then run your LEDs in serries parrellel. 3 strings of 3 COB LED arrays. Set the driver to output around 600 to 750mA.
You should run those COB arrays at currents below their rated 300mA anyway as they look to be 3 rows of diodes wired in parallel internally, so pushing them to max is asking for them to burn out........
karimwassef
Active member
+1 on the DC voltage risk. Don't go above 50V unless you're super confident in your design and implementation abilities. So, only 5 LEDs on a string at 10V each.
The higher the voltage, the greater the potential for a ground fault due to dirt, salt, water or any other contaminants from the peak voltage to ground. Assuming you're properly grounded, it would trip your GFCI (good for you) and cause more headaches.
The higher the voltage, the greater the potential for a ground fault due to dirt, salt, water or any other contaminants from the peak voltage to ground. Assuming you're properly grounded, it would trip your GFCI (good for you) and cause more headaches.
I've been told by a few electritians that the DC side of drivers and PSU's are isolated from the wall outlet and AC mains and more than likely will just keep on shocking you and not trip the GFCI. Thus one of the reasons for much higher risk with DC voltage supplies over 50 volts. 50 volts can't do much harm to you in most cases (could still stop your heart under the right conditions just not likely). but higher than 50 volts gets potentially very dangerous.
karimwassef
Active member
The LEDs are isolated, but I always ground my fixtures.
