Tag Archive: technology


In an attempt to get my new venture and my books in order, I ordered a new shed to use as an office. Getting electricity out to it is a nightmare, to get over this issue I chose to fit a solar panel and use Nicds as the storage medium (something I can get for nothing!). On my workbench, I have enough 3V6 1500mah batteries to make a 12v (actually around 15v fully charged) 10.5ah pack but I came to an issue after building my first 12v 1500mah pack, How do I balance charge this and how do I get a 3V6 tap that won’t cause issues.

To this end, I came up with designs for the following sub-packs.

Screen Shot 2017-10-28 at 21.10.14

As you can see, the above pack designs are of a different supply voltage.

Why 2 different voltages?

My lighting is supplied from 3V6 recycled Led lighting (ignoring the 240V side) but I also need 12V for the charge controller and inverter required for none 12V equipment!

One of my dilemmas comes from the 12V side. Do I build the packs as 12v packs which are easier to upgrade by adding more packs or, do I build the packs as 3V6 which require me to add cells to all the packs at the same time. The second dilemma comes from keeping them balanced charged.

If anyone knows the answer to this, please tell me which is the best construction method!

PSP 110 Battery Revive.

PSP 110 Battery Revive.

Well After a bit of soldering and electronics jiggery pokery my PSP 110 battery is charging.

The internals of the PSP 110 battery

No wonder it failed when it was soldered like that.

 

This picture showing the internals of the battery including the Charge control and monitor board. By my guess the way the B+ terminal was soldered may have been responsible for it failing. I disconnected the battery from the pcb and checked the terminals to find they were reading 0.2 ish volts showing a dead cell. After cobbling a batter charger together to charge at 2.3v with very little milliamp’s and leaving it on for 11 hrs, I checked the cell voltage a various times to find it slowly climbing until it reached 2.3v.

Fearing it left on over night I disconnected the battery and charge and left it. The next morning I checked the voltage to find it still holding 2.3 v (2.34 v to be exact). I re-soldered the contacts (properly this time) popped it into my spare PSP 1003 to charge and now the charge light is on.

The only problem with this method is the pcb now no longer reads the charge rate properly! I hope that after continual charging and discharging it will recalibrate it’s self or I may have to find a way to reset the regulator board.

I hope others with this issue find it useful.

つづく