This is the last of our articles on the LED strips and their power supplies. This is because, as far as we’re concerned, we’ve nailed it.
Ladies and gentlemen, we present to you the final word in battery power for portable LED strip lighting applications. This pair of bad boys are the ultimate in getting every single last Coulomb out of a ‘D’ cell into the LEDs of a flexible LED lighting strip.
The user simply needs to pop in four ‘D’ cells, throw the switch, and away it goes; happily suppling the LEDs with 9 Volts until the cells reach about 2.7 Volts in total.
The miniature circuitry in the small black box to the side takes whatever input voltage – below 9 Volts – and makes it 9 Volts.
It is exactly the same circuit as used in the ‘stand alone’ unit previously featured with the ‘AA’ cells in their separate holder, but this time, there is no need for the extra unit -it is already built-in to the side of the battery holder.
As you can see, the power switch is located on the outside of the smaller black case, very near to the power output lead.
This output lead is connected to a standard 2.1mm power socket, so is fully compatible with the existing flying sockets wired onto the LED strips themselves.
All the user needs to do is literally plug the unit in, switch it on, then forget about it.
This unit will last nearly seven times longer than the unit powered by ‘AA’ cells.
Then the final word in battery-powered LED strips is this bad boy.
Having 8 cells, it means with new batteries, it will in theory supply 12 Volts, but with the controller mounted in the smaller black box, will actually buck the input voltage down to 9 Volts whilst the batteries are still fresh and new, but as soon as they drop below 9 Volts, the boost circuit seamlessly engages, thereby squeezing almost every last electron out of the batteries before they die.
We believe the first ‘D’ cell circuit will last for about 100 hours of continuous use with Alkaline batteries, but this last circuit we think will easily last in excess of 250 hours before the batteries finally die. We are currently awaiting the results of our lab tests for the final numbers.
Whilst we were designing and prototyping this circuit, we were in doubt as to whether we should have chosen rechargeable lead-acid batteries, but after working through the maths, then a little research on lead-acid, we came to the firm conclusion that ‘D’ cells actually have a greater storage capacity than a small/medium sized lead-acid battery, and in the long run, it actually works out cheaper to use rechargeable ‘D’ cells than using lead-acid.
As with the previous unit, this one has the ‘standard’ 2.1mm output plug to connect directly to an LED strip.
These units will be available within a couple of weeks, with a lead-time of two weeks, in multiples of 100 per order. Stickers for the units will also be available to whatever design the customer may choose.
For costings, please call us on the number above to discuss, or send an email to the address in the header.