Question about QB Driver draw

QeedFarmer · Feb 14, 2020

hi,

I bought a 2 boards (+ double heatsink + MW 240W driver) combo and since I only have 2 seedlings, I disconnected 1 board but when I cranking the brightness volume all the way the power meter says it draw about 280W

Questions:
1. Is my power meter off? Because there's no way a 240W can draw over 280W!?
2. Will running a single board at max (240W) damage the board?
3. Using same brightness setting, I connect the other board, and 2 boards now draw the same amount of power (as when I use a single board), what happens here?

Cheers
Q

Boatguy · Feb 14, 2020

QeedFarmer said:
hi,

I bought a 2 boards (+ double heatsink + MW 240W driver) combo and since I only have 2 seedlings, I disconnected 1 board but when I cranking the brightness volume all the way the power meter says it draw about 280W

Questions:
1. Is my power meter off? Because there's no way a 240W can draw over 280W!?
2. Will running a single board at max (240W) damage the board?
3. Using same brightness setting, I connect the other board, and 2 boards now draw the same amount of power (as when I use a single board), what happens here?

Cheers
Q

Some meanwell drivers draw more than advertised
Running two lights on a single driver, they share the available current. So ,for example, the single would be at 2amps by itself, two lights would be running at 1 amp each.

coreywebster · Feb 14, 2020

Don't try and run one board at 240w

My original v1 260w kits all pull 285w.

bigmikey86 · Feb 14, 2020

QeedFarmer said:
hi,

I bought a 2 boards (+ double heatsink + MW 240W driver) combo and since I only have 2 seedlings, I disconnected 1 board but when I cranking the brightness volume all the way the power meter says it draw about 280W

Questions:
1. Is my power meter off? Because there's no way a 240W can draw over 280W!?
2. Will running a single board at max (240W) damage the board?
3. Using same brightness setting, I connect the other board, and 2 boards now draw the same amount of power (as when I use a single board), what happens here?

Cheers
Q

Like Corey said, definitely do not want to drive a single board at 240w. When it comes to the drivers, there’s always an electrical loss from input wattage to output wattage. What series of Meanwell driver is it? I know the a HLG 240h 48ab driver has about a 9.3% efficiency loss meaning my wattage meter says max is 263w but the driver is only putting out 240w to the boards. If you look up the Meanwell spec sheet for your driver you can see the efficiency %.

QeedFarmer · Feb 14, 2020

All clear now, im still running one board, but use my watt meter to dial in, and the temp. is a few Celsius above T room, so I think I'm safe. thanks guys

coreywebster · Feb 14, 2020

QeedFarmer said:
All clear now, im still running one board, but use my watt meter to dial in, and the temp. is a few Celsius above T room, so I think I'm safe. thanks guys

I think max rated current on the HLG boards is 3amp but the Chinese clones may be different so try and find out the max rating so you don't fry your single board.

Rocket Soul · Feb 15, 2020

One board shouldnt be run at 240w. However ledgardener tried to destroy a board with a 600w. I recommend seeing the results for yourselves, youtube ledgardener qb torture, its a great watch. No spoiler but they can take a lot more than what you'd think.

Is your driver A version/internal dimming? Then its quite normal it goes up a bit further.

QeedFarmer · Feb 16, 2020

Rocket Soul said:
One board shouldnt be run at 240w. However ledgardener tried to destroy a board with a 600w. I recommend seeing the results for yourselves, youtube ledgardener qb torture, its a great watch. No spoiler but they can take a lot more than what you'd think.

Is your driver A version/internal dimming? Then its quite normal it goes up a bit further.

Mine came with an external dimming, the driver is HLG-240H-48AB to be precise

Rocket Soul · Feb 16, 2020

QeedFarmer said:
Mine came with an external dimming, the driver is HLG-240H-48AB to be precise

Dont know too much about those, generally the internal dimmer will take the driver up to 11 sort of, you can sometimes get the same from using 110 k ohm resistor instead of 100.

Airwalker16 · Feb 16, 2020

Rocket Soul said:
Dont know too much about those, generally the internal dimmer will take the driver up to 11 sort of, you can sometimes get the same from using 110 k ohm resistor instead of 100.

I thought you used a 10K ohm resistor on the potentiometer. That's what I've always used.

Rocket Soul · Feb 16, 2020

Airwalker16 said:
I thought you used a 10K ohm resistor on the potentiometer. That's what I've always used.

Cant quite remember now, i do remember that adding 10 to the standard would squeeze out those extra watts from the driver.

Airwalker16 · Feb 16, 2020

Rocket Soul said:
Cant quite remember now, i do remember that adding 10 to the standard would squeeze out those extra watts from the driver.

It's a 100K ohm Pot WITH a 10K ohm resistor.

Question about QB Driver draw

QeedFarmer

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Boatguy

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coreywebster

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bigmikey86

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QeedFarmer

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coreywebster

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Rocket Soul

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QeedFarmer

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Rocket Soul

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Airwalker16

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Rocket Soul

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Airwalker16

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