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[Gregski]

So I spent the last umpteen months waiting on an affordable Alltrax AXE7245 450a 24-72v controller to show up on eBay and it finally did, for $275 (including shipping) = score!

So my new (used) controller arrived yesterday. 

I found out you use the same 3A diode for 200A and up contactors so we are good there, however I am using a 470 ohm 10W resistor now and I need the 1000 Ohm 10W for the 72 volt system.  Does that mean I don’t need to change until I add two more batteries?  Right now I just want to try the new controller with my existing four 12 volt lead acid batteries, ie 48 volt system.

[Gregski]

Monday was Martin Luther King Jr. holiday so I tinkered with the bike, and swapped out the 300 amp controller with the new(er) 450 am controller, and I am pleasantly pleased.  First of all the 450 is about 2 inches longer so I had to mount it vertically instead of horizontally, but that's neither here nor there.  The important thing is that even with only 4 lead acid batteries (48 volts) the bike is much quicker and I can get up to just shy of 40 mph.  I weigh 200lbs so that is pretty darn good.  I can't wait to add the other two batteries for my ultimate 72 volt goal / system... stay tuned.