Cell balancing pcb’s are connected in parallel to the arduino BMS controller shield (comming soon, check out my Danish version of this site to follow the developing process, first 09beta version running now)

Functions in RC1 cell balancing PCB:

1. Detects Vlow (ca. 2,85 volt) and opto coupler patch info to the arduino based BMS controller
2. Detects Vhighhigh (4,2 volt) and opto coupler patch info to the arduino BMS controller
3. Balancing the cell at Vhigh with a load resistor, switched on with a Darlington transistor

This cell module can be used for electric vehicles with LiFePo4 batteris, just by changing some configuration in the arduino sketch, and a few components on the arduino BMS controller shield.

My inspiration for this project came from the raising amount of standard 18650 LiIon cells, i salvage from defect labtop batteries, and other LiIon driven electronic.

I simply hate to trough out things that works. Also i have a electic bicycle, cleaning robots and dream about making a eletric outboud boat motor, using salvaged cells, so i decided to make my own BMS, and use other components i had on the shelf doing nothing.

I had some transistors, power resistors, optocouplers, resistors and more, so thats why this first version is with analog leaded components.

This cell module can be modified to fit the new LTO battetry cell.

the cell module can NOT by it self disable the charger or turn of the load at Vlow. The cell module are not for standalone, they work together with the arduino BMS controller shield.

The picture above show the cell module with the 18650 LiIon cell from a dead labtop.

Often more cells in the labtop battery are in fully working condition, or the original cell pcb is defect. It is possible to get hånds of a lot of free LiIon cells for fully working DIY battery packs.

schematic for BMS cell pcb version RC1:

component placement Version RC1 of BMS cell pcb

Printlayout RC1 BMS cell pcb:

Bms Diy Arduino 08b

This picture show a salvaged Pentium 4 cooling plate with fan mounted on top of it.

The complete MPPT solar charger is mounted to the cooling plate, using a aluminium U profile, where the MOSFETs and voltage regulator are placed.

The picture above shows the aluminium U profile, as You can se it is a few millimeters to wide..

To complete the mppt solar charger project, i still need to do some work with a plastic cabinet, and also i will make some kind of temperature controlled PWM speed adjustment for the fan.

The next experiment will be a slightly larger model of aluminum and mounted on the shaft / bearing from a scrapped ceiling fans. There must then find some neodymium magnets and wound some coils which must then be made ​​into a simple administrator.

A model of my small offgrid DIY VAWT wind turbine of cardboard and debris from two cdrom boxes.

The video above demonstrates that VAWT wind turbine rotor blades operate with air from a fan heater.

It has been tested in steady wind outdoors too, and it works.

Inspiration to experiment with VAWT wind turbine found here 

A scrapped ceiling fan contains bearings, shaft and casing for a generator. Counting on it can be made of some neodymium magnets and some self-wound coils.

Alternatively, a place Smooth-running motor is used as a bearing for a mini VAWT wind turbine.

It could make a lot of small VAWT turbines which are connected to a local smart grid that distributes power around your house with a DOS power rail. It would be a good addition to photovoltaics in the winter. The question is whether municipal, laws and regulations may prevent one set eg 10 mini VAWT wind turbines?

Links and ressourcess to VAWT small wind turbine

VAWT windmill 12V 50W Telescopic Vertical Axis Wind Turbine

Helix Wind design airfoils for VAWT windmill

strator design tobrushless permanent magnet generator

Video show the Helix Wind’s airfoils

 Links and ressourcer to more VAWT diy

 Strator, neudym magnets and other parts for VAWT windmill