When I bought the Vectrix, I knew it had a nearly end of life battery. Well, that nearly is gone and I need to replace it.
I know someone is going to jump straight to "Leaf" battery. It's my fall back plan, but my primary plan is to use 30AH Lithium Titanate.
There are several reasons:
1. LTO have incredibly long lives. 10,000 cycles if you do a 80% DOD, 20,000 if you do 60% DOD. 30 year shelf life.
2. LTO performs well in cold weather. I've noticed even NMC Lithium sags a lot more than it did in summer
3. LTO has an incredible genuine C rate - These "cheapies" can do 10C (300A), but the genuine Toshiba SCiBs have something like 280C rates - Almost supercapacitor.
4. I've already sunk 1/4 of the cost playing around with these.
Anyway, to get 150v, I need 60S. They are 66mm x 160mm, but the trick is, since they are cylindrical, you nest the next layer between the gap made by the previous layer. As such, the first layer is 66mm (as expected). The next layer only adds 55mm. Hard to explain, easy to show in a photo:
Doing this of course makes the battery wider because of the overhang, but only by 35mm.
So by my maths:
Width = easy - 160mm + length of bolts = 210mm Fits
Length = 10 x 66mm +35mm overhang = 695mm - Very close - Box will have to be thin.
Height 66mm + (54mm x 5) = 336mm - apparently the max is 340mm, and I haven't even considered the thickness of the box.
Is there any way I can make this work?