6th Annual BLF / Old Lumens Scratch Made Light Contest - FmC's Hand Made entry. Jack's Survival Sack!

Giveaways and Contests
24

Iā€™m not sure what happened to Captain Murdoch after the 80ā€™sā€¦ I heard he immigrated somewhere :disguised_face:

Lol - thatā€™s probably closer to the markā€¦. :smiley:

25

Very nice start FmC, glad that Jack is back on board on this yearā€™s build! That composite stuff is great, I have some in orange, a leftover from a building site. It is a pity you can not get it easy.

26

:+1: Cool!

27

Pics are good now, and everything looks like itā€™s coming together nicely, in spite of Jackā€™s help! :smiling_imp:

28

People here are so devilishly clever. Scary sometimes.

Great work, keep Barbie out of the picture or Jack will never finish in timeā€¦

29

Good luck with the build, Jack !

:beer:

30

Why use 219As? Iā€™ve never seen those emitters used in a light before. Granted, Iā€™ve only been in the hobby for a couple years. I think they were obsolete by the time I started.

31

perhaps they were already on hand??

32

Itā€™s what I had lying about, plus they are renowned for a nice Rosy tint, which Jack is fond ofā€¦

33

Nice progress wee man :smiley: :+1:

34

I find it amazing the sheer work that goes into setting up pics of Jack at work as compared to the work going into the project itself. Well done! So well thought out and an incredibly interesting way to go about it! :slight_smile:

35

What do you mean by setting up pictures of Jack? :person_facepalming:

36

You know, getting the pics without disturbing his work, tricky doing that. :wink: Most talented artists do NOT like having their photo taken at work. Disrupts the flow or something, they say.

37

:slight_smile:

38

Ok - a little more work shown in post#3, including The Artist at work :smiley:

39

So you have a 12 Volts Solar panel to charge 4x 3.7 Volts parallel batteries?
Yes, the panel will have higher Voltage when there is no load.
Once you start drawing current (load), the Voltage will drop.
Too much load and the Voltage will be lower than specified.

Maybe i missed it, but i assume you will be using a buck converter to go from 12 Volts to 4.2 Volts?

40

Iā€™m using these USB step down modules;

Hereā€™s the Panel Specs;

Maximum Power(Pmax): 10W
Maximum Power Current(Imp): 0.56A

Maximum Power Voltage(Vmp):
18.00V

Open Circuit Voltage(Voc):
21.5V

Short Circuit Current(Isc):
0.62A

At only ~10W, itā€™s not a powerhouse, but should provide adequate charge throughout the course of a day.

41

Okay, step down from panel to 5 Volts.
And after that? A charging circuit?
That will eat up some power too thoughā€¦
But it will work.
But i think you only need charging termination.
The current at 10 Watts to 4.2 Volts is only 2+ Amperes.
So thereā€™s no real need to regulate the charging current.
As long as it stops at 4.2 Volts.

42

You should be familliar with the charge module :slight_smile:

43

Jacks playin with ya. Thats why there isnā€™t enough current.