Search found 6 matches

by boatie
Sun, 11 Dec 2011, 17:59
Forum: Batteries, charging, management and monitoring
Topic: Cells Voltage Difference
Replies: 9
Views: 1348

Cells Voltage Difference

Hi, Thanks for all the information. It must be problem with the charger but I am not sure what it is as I tried another cell and the same thing happened. I think that the charger was designed for much smaller cells. Later I tried charging with 4.1V and had no trouble reaching 3.6V. Problem with the ...
by boatie
Tue, 06 Dec 2011, 19:11
Forum: Batteries, charging, management and monitoring
Topic: Cells Voltage Difference
Replies: 9
Views: 1348

Cells Voltage Difference

Thanks for the advice. I'll try charging with a bit higher voltage.
by boatie
Mon, 05 Dec 2011, 19:10
Forum: Batteries, charging, management and monitoring
Topic: Cells Voltage Difference
Replies: 9
Views: 1348

Cells Voltage Difference

Hi, I bought 8 90Ah cells. Unfortunately one was damaged in transport (leaked electrolyte) so I am waiting for a replacement cell. I charged bunch of 4 cells using Imax Duo charger that monitors individual cells with 4x3.6V = 14.4V voltage charge. For a long time voltage appears to be very close on ...
by boatie
Fri, 28 Oct 2011, 14:37
Forum: Batteries, charging, management and monitoring
Topic: LiFePO4 batteries for an electric boat
Replies: 16
Views: 3767

LiFePO4 batteries for an electric boat

I enquired about 12V batteries with EV Works. The answer: “The 12V cells are made up of four individual cells, they are moulded together from the factory. No BMS is installed in the pack so it is important they are not over discharged.” So no balancing of those 4 cells through the battery life - int...
by boatie
Wed, 26 Oct 2011, 18:30
Forum: Batteries, charging, management and monitoring
Topic: LiFePO4 batteries for an electric boat
Replies: 16
Views: 3767

LiFePO4 batteries for an electric boat

Thanks again for advice. Has anyone ordered batteries from EV Works? They seem to have a good range on their web site including 12V batteries. I wonder about individual cells in 12V battery. Do they have some sort of management system within these batteries? Link: http://www.evworks.com.au/index.php...
by boatie
Mon, 24 Oct 2011, 00:31
Forum: Batteries, charging, management and monitoring
Topic: LiFePO4 batteries for an electric boat
Replies: 16
Views: 3767

LiFePO4 batteries for an electric boat

My apologies for posting electric boat question on EV forum, but where else to ask the battery question? I have a 3.7m boat with 24V electric engine Torqeedo 801 and two 12V 55Ah Optima led acid batteries that I bought about year and half ago. The maximum power is 800W but boat goes well with around...