Guru
Joined: 15/07/2006
Location: AustraliaPosts: 640
| Posted: 01:15am 11 Aug 2013 |
The new pack is bigger, much bigger. Compare………..
Old pack originally was 45 cells x 3.2v = 144v x 200ah = 28800 Whrs or 28.8kWhrs
Later lost one and added 8 more to make it 52 cells x 3.2v = 166.4v x 200ah = 33280 Whrs or 33.28 kWhrs
New pack 52 cells x 3.2v = 166.4 x 260ah = 43264 Whrs or 43.264 kWhrs
Taking data from http://www.thebackshed.com/forum/forum_posts.asp?TID=902&PN= 3&TPN=2 , this new pack should give 116km / 25kWhrs (3 kWhrs spare) x 40 kWhrs (3 kWhrs spare) = 186 km driving at 100km/hr.
I don’t intend to be making any range testing, I am sure that every deep discharge some cycles are lost. Cost of the new pack at current retail $1.40/ah x 260ah x 52 cells = $18928
Here are some pictures of the new alloy battery box. It has been changed to alloy so that the box can still be sealed, keeping out dust, water and mud, but is a massive heat sink, letting out any heat generated. So far the highest temperature I have seen is 26 degrees C. The box is made from 3mm alloy checker plate. The hydraulic pan brake I used did not have a deep throat so some sections had to be bent by hand with steel clamped near the bend lines. The box was made up in 4 sections and TIG welded together. Apologies for the poor quality pictures.
Trev @ drivebynature.com