Question 1

Will the 300 watt power supply be enough to power 7 of the one meter 144 led ws2812b or ws2813b led strips?

Accepted Answer

Yes ,it is enough . But you have to know this .
We recommend you don't light up full white light.

The LEDs at the far end of the strip might be dimmer because of the added resistance and voltage drop that occurs as the current flows to that end of the strip.This is a normal physical phenomenon, and all the LED strip cannot avoid this problem.

The factors that affect brightness are：
1.Length . If your project is too long , the voltage drops .
2.Power supply . Make sure the power is enough for the project .
3.Lighting effect . Full white lighting effect will consume a lot of energy .When you Light up 1 color（red or green or blue or pure white) 0.1W/LED . Light up 2 colors (red+green) 0.2W/LED , Light up 3 colors (red+green+blue=mixed white) 0.3W/LED .Light up 4 colors (red+green+blue+pure white),0.4W/LED
4.Brightness. The brighter the brightness, the more the consumption
5.LED quantity .  More LEDs ,need more power .

Solution：
1.Adding voltage every 1 meters (3.28ft) .
2.Lower brightness
3.Enough power
4.Avoid full white lighting effect . 
5.Using DC12V or DC24V LED strip.
6.Use 30LEDs/m to instead of 60LEDs/m or 144LEDs/m
support@btf-lighting.com

Question 2

For the output, can i combine any + and any - ? i connected my barrel connector to power led controller and the wires got super hot

Accepted Answer

Yeah, I ended up returning all of the power supplies. They were super hot and some ended up burning out, just to power up 12 feet of led strip. Very disappointing.

Question 3

How to change the input voltage setting?

Accepted Answer

you will see the buttion  on the side

Question 4

On the 40a, what are the positions of the voltage switch?  Left is what?  Right is what?

Accepted Answer

You can take a look for the label , the left is 110V   the right is 220V

ASIN	B01D8FLZV6
Best Sellers Rank	#152,566 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #243 in Lighting Low Voltage Transformers
Brand	BTF-LIGHTING
Brand Name	BTF-LIGHTING
Current Rating	60 A
Customer Reviews	4.4 out of 5 stars 155 Reviews
EU Spare Part Availability Duration	1 years
Item Dimensions D x W x H	4.53"D x 8.46"W x 1.97"H
Manufacturer	BTF-LIGHTING Technology Co., Limited
Maximum Frequency	60 hertz
Minimum Frequency	50 hertz
Model	A5V60A
Mounting Type	Panel Mount
Number of Items	1
Part Number	A5V60A
Power Source	AC
Product Dimensions	4.53"D x 8.46"W x 1.97"H
Specification Met	CE, FCC
UPC	602938069816

BTF-LIGHTING AC100-240V to DC5V60A Max300W Switching Power Supply Device Transformer Adapter Converter for LED Strip/String/LED Matrix,CCTV Camera,Security System,Radio,Cats

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