Vectrix Lithium conversion kit V2 - with some CALB 70AH shoe horned in
Hi Guys,
I'm finally getting ready to sell the much anticipated 70AH conversion kit
here's a picture of a nearly finnished product:
And modification charger to charge 70ah?
Looks a bit awkward to ride :)
Looks a bit awkward to ride :)
^^^forget that...only first photo showed up initially!
just as I'm thinking about this,
THe fuel guage with The version of firmware that allos charging of the 70Ah cells does not yet work, however, the voltage is shown while riding
at least one of the people who have purchase this new kit is planning on relying on that and not installing a cycle analyst
While I don't recommend riding with no Ah count, keeping an eye on pack voltage only may work ok
The risk is the bike won't stop you from overdischarging the cells, but the voltage sagging below 120v while riding is where you would stop
Matt
Sounds easy to monitor.
I am using The Lairds software for a while now and I never look at the fuel gauge anymore. I only look at the voltage readout now. At 130V I go into conservative mode and at 120V I consider it empty tank.
It made me think that the fuel gauge might as well be used as Voltage gauge also the same way it does when the charger fails.
I am using The Lairds software for a while now and I never look at the fuel gauge anymore. I only look at the voltage readout now. At 130V I go into conservative mode and at 120V I consider it empty tank.
It made me think that the fuel gauge might as well be used as Voltage gauge also the same way it does when the charger fails.
So full discharge is ??? 102v?
that sorta works, except most of the capacity in a good pack will be between 125 and 130vdc
on the fuel guage when working as a volt guage, that represents 2 bars - not really enough to be meaningful
full discharge is between 115v and 125v - the reason I say between is you should stop when the first cell is depleted, but you can't tell from pack voltage alone as a single cell reversing only causes a voltage drop of 1.5v
best practice is to measure the capacity of the smallest cell and scale the fuel guage AH count to that amount
The problem is actually worse with the lithium kit, as the voltage stays the same for most of the discharge.
So the voltage readout will give you an idea when you should stop, but no prior warning that an AH based fuel would
That's why I recommend the cycle analyst
Matt
If you ever get an agent who can do this conversion in Melbourne, let me know. It might just be the arm twist I need to do it.
Looking at the pictures again I see only 20 CALB cells in the top layer. Are there 22 in the bottom layer?
Also, would another stacking method work for cells with more than 115mm width but less depth?
I was just looking at those 100Ah cells from the other thread and they might fit 5x3 laying and 3 high gives 45 cells.
Crazy idea or possible?
Looking at the pictures again I see only 20 CALB cells in the top layer. Are there 22 in the bottom layer?
Yes, thats correct
Also, would another stacking method work for cells with more than 115mm width but less depth?
I was just looking at those 100Ah cells from the other thread and they might fit 5x3 laying and 3 high gives 45 cells.
Crazy idea or possible?
That could work, as long as those cells don't mind being on their sides
The same approach could be used for WINA 100Ah cells
CALB would appear to no longer make the SE 70Ah cells, which is a shame.
I have found this cell that has the same dimensions though: http://www.ev-power.eu/WINA-30Ah-100Ah/WINA-LiFePO4-Power-3-2V-72Ah-aluminium-case.html
72Ah so even a slight increase in capacity.
Matt
Oops, I mean this is the kit nearly finnished installation on a Vectrix:
This is how the kit will look as shipped (with the old nimh battery container as a packing material):
