I'm starting by upgrading
the cars drive lead acid battery's with Nickel Metal
Hydride Batteries (NiMH)
that have been salvaged
from a Honda Insight Hybrid Car. There are normally 20
of these sticks in the Insight, initially I will be
using 48 of them. The battery's come in sticks made
up of 6 cells
and the nominal
7.2volts per stick. The cells have an advantage
that they can if required handle a load of up to 100
have two strings of 24 sticks, I have a potential
of 200amps at somewhere near 172volts. (that's the theory).
Pictured are the NiMH battery's,
there is a downside to these units, they don't hold
their charge for long and also the cells
have been in a discharged state for some time, essentially
the cells need to be brought back to life. My solution
is by charging them singly with hobby RC chargers,
then making a record of the discharge rates of each
battery over a period of 2 weeks. This process will
help identify any problematic sticks.
To make charging a
little easier I have now made a battery tray that you
just place the batteries
on to to charge. This saves a fair bit of time messing
around with crocodile clips etc.
To help with the reconditioning
or cycling of the battery's, Paul made this 4 way
discharge unit that does not allow the batteries to
per cell i.e. 6volts.