Can make a schemtic for me?

Hi James,

I only looked at about a minute of the video so I may not have fully understand the requirement : ( but if it's a portable 12V supply for a radio that you're looking for, a much cheaper way (rather than paying or trading for a design) is to consider using an off-the-shelf item like a Lithium Ion power pack (some provide 12V) or a car jump starter, since they can provide 12V from their output port, at high power. Here's an example one (but others are lower cost, and probably better): Energizer 50807 Car Jump Starter Half Review, Half Teardown  . Also, a good brand one should be safe. It will provide maybe 50Wh depending on the one you choose, so a couple of them are approaching the same amount of capacity as the one in the video (i.e. use them one after the other, not to be paralleled without additional circuitry), and are more flexible, phones can be charged from the 5V port too.

EDIT: Having said that, probably the car chargers can be paralleled with no issue. It would need to be tested though (measuring current through each of them, and only worth attempting on a good brand one with protection circuitry. So better to use them one at a time, or design an OR'ing circuit.

Thanks so much for looking at my request. From your answer, I see I need to add a few details. I am a newly licensed for Amature Radio. As my wife is in no way going to let me drill holes through the walls to run cables for an antenna, I have elected to do portable / mobile. With that, I have a few reasons why I want to make my own build. I have found only one place that seels what I'm after but they are about the coast of what I can make it for. The video I linked to the original email had this build as a 12v 10Ah 128 wh build.  The battery builds from that web site serves the purpose of sustaining the Amature radio operator in the field while also giving power to other items. Such as cell phone, computer or tablet. As safety is a major issue with me, these batteries are LifePo4 Lithium iron phosphate. Which all my research says are safer than the other batteries. In case you're a bit more interested here is the blog of the guy who makes these videos DIY Portable LiFePO4 battery power for ham radio – OH8STN.

Try and watch the complete video and look at his blog if you have time. I am most interested to know what you think then.

Again thanks so much for answering my question.

James KC3NVS 73

"I want to make a schematic for this video."

A schematic is already available in the earlier video:

https://youtu.be/Fdjn1nSrkkY?t=679

(11min 19secs into it)

The additional charge controller gets added between the solar panel(charger) and the BMS P+ / P- and the in-line voltmeter moved to its load output.

This earlier video also shows the wiring for the initialisation/reset switch (connected between P+ and B+ of the BMS) which wasn't well documented in the later video.

You can get a closer look at the BMS here:

https://shop.lipopower.de/bilder/produkte/gross/1680.jpg

If you want to colour the schematic in, then in the video

- the yellow wires to the batteries were connected to B1, B2, & B3

- the red wire to the batteries was connected to B+

- the black wire to the batteries was connected to B-

Dave,

Thanks for all your help.

James

I want to thank you all for your help. I had forgotten about a resource that can help me with my project. For those of you in the Philadelphia or Delaware area, this resource may help. It may even be able to help those of you who are both out of state and out of the US. The resource is a place called NextFab and the link is http://www.nextfab.com.

Thanks again.

James