DIY Vero 29 and BBxWW veg

Halfandhalf

Well-Known Member
So I finally got my light completed, well mostly anyway. I'm still ironing out a few things but I thought i'd share. (it's running alongside two platinum p150's and four 18 watt led flood lights around the edge)

PICTURES

Details

[3xVero 29se 3500k @ ~51v

HLG 240h-c1400b

APV-12-12

3xICELED Xtra Ultra - Had to add a thin sheet of metal under these because the air was blowing straight through on to the plants and it wasn't a light breeze. These are also complete overkill but oh well. The xtra 550 would have been enough from the same company.

Aluminum angle 3/4"x3/4"x1/8"x8ft cut to twenty inch bars.

a few other items... junction box, 100k potentiometer with 10k resistor, 22 awg wire, ac digital display multimeter, probably forgetting some stuff

Set out to build this last week and finally came together. Pretty happy with the results except that something is wrong with either the multimeter output or the amount of power the system is using. Each cob should be running at about ~51 volts at 1.4 amps which is 71.4 watts each and 214.2 watts total. The multimeter only reads 204 watts top though so something funny is going on. I read that the polarity on some small devices might matter even in ac so I'm gonna switch around the load wires to see if that affects it (when I get around to it). Im also wondering if the resistor I added is messing with the power as well, but I'm not sure how it could be since it's on the minus side and the minimum is stopping at 10% of power like it should. Actually I don't remember if I connected the fans to the multimeter or not, if they are it's 20 watts below what it should be total. Looking at the amps, it's measuring above 1.4 so I think it is measuring the fans but even then the fans are .23 each or .69 total so the total amps of the system should be 2.09 not the 1.7 it's showing... not sure what's going on. I was planning on switching to 18 awg wire eventually but I don't think that would fix this. Any suggestions/insight on this would be appreciated.

The plants are white widow x big bud and I'm in the process of manifolding them. Temps look high atm but I had a mars 300 right before taking the pictures and this light runs cooler so it should go down. I accidentally cut off one node on the right plant that was going to be two of eight nodes so I had to compensate with 4 on the other side and hoping it equals out with some lst. Thinking about going up to 16 to fill out the tent a bit more but then again my yields are almost always overkill for what I use and I'm mostly trying to get quality over quantity so we'll see. Again, comments and suggestions appreciated!

Have a great day :)
 
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Halfandhalf

Well-Known Member
Still won't let me post links even though I exceed requirements.. Oh well.. sneaky link. On imgur /a/owLDY
 

Halfandhalf

Well-Known Member
Turns out without the pot I get 236 watts. Using another pot gives me a max of 222 watts but slowly was falling. The original pot settled at about 199 watts. What is going on here? Do I have bad pots? Got them from ebay 5 for $5, b100k linear pots.
 

Jimmyclone42

Well-Known Member
Check the resistance of each pot.. You will find it pretty difficult to find one at 100k.. I think china believes anywhere between 80-95k is good enough...
 

GBAUTO

Well-Known Member
Check the resistance of each pot.. You will find it pretty difficult to find one at 100k.. I think china believes anywhere between 80-95k is good enough...
This¥¥¥-
Or you could splice in a 10K in series and call it a day.
 

Jimmyclone42

Well-Known Member
You should already have a 10k resistor in series with the 100k pot, to not allow dimming below 10%. This will not add the resistance to your pot, it will make sure there is always 10k ohms of resistance in your circuit to not damage the cobs by going below 10% power. If anything you could buy a 125k pot, add your 10k resistor, and be sure your getting full pull on your driver, the only downside is you will have some extra play in the knob.. Not a big deal..
Cheers
 

GBAUTO

Well-Known Member
Proofreading was never my strong point...
Simple problem- the dimmer circuit isn't seeing enough resistance between the leads to run full power.
Add more resistance
 

Halfandhalf

Well-Known Member
Add more resistance to the max/+ side? Or buy a 125k pot? Not sure if that first way works, was gonna try it.
 
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