Guru
Joined: 15/07/2006
Location: AustraliaPosts: 676
| Posted: 09:27am 26 Feb 2012 |
The 3.7v chargers have been taken out, a while ago.
The 14.8v chargers have been fitted, waiting for the Relativities Active Balancing circuits. Yes, we are going to test again in the EV Hilux! It has been a long time! Am I excited? Should be here soon. I did not bother trying to mount the 14.8v chargers, they are just in the battery box.
The idea is that the 14.8v chargers can assist in providing a better spread of power without the huge number of chargers used in single cell charging. It is at the end of charge that the biggest difference in cell voltage occurs, and that's where these 14.8v chargers will work. Only needed in the long series string of an EV. Not needed in a solar/wind RE system using a smaller number of cells in a series string.
Last weekend I had to manual balance the main pack again. I used several 3.7v chargers and a 12v auto light. Much quicker manual balancing than I have done in previous times. Though much longer time than when I had a 3.7v charger on every cell and every morning they were switched on.
The 12v block voltages were getting further apart. Peak difference this morning was 3.80v to 3.33v. I connected 4 of the 3.7v chargers to balance them. As said before, these cells (12v block cells) have not been balanced since I had the very first Relativities prototype on them. After a few hours the peak difference was 3.71v to 3.73v. Very Good. They will be right for a long time again.
Trev @ drivebynature.com