It has been suggested to me by more than one knowledgeable EV builder that
it's often best to pick your batteries first, then design the rest of the
EV around them. Would you like to go far or fast? Your battery choice will
determine how much energy (range) and power (acceleration) you have
available. It will also allow you to determine what type of vehicle would
be appropriate for a given battery pack size (cost).
Unfortunately, the only two readily available options are flooded
lead-acid and sealed lead-acid. Neither would perform particularly well
for 100km range. Especially with hills or in cold weather.
I have a VW Cabriolet using 19x 6V Trojan T-105 batteries. According to
the "rules of thumb", I should have a range of about 75 miles at 30-45MPH.
In reality, I live in a hilly area and can manage about 30 miles IN THE
SUMMER. When temps drop below 35F at night my range decreases to 15-20
Average current draw @ 30MPH: 60A
On a slight grade: 125A
On a moderate grade: 200A
On a steep grade: 300A+
While my batteries would last over two hours at 60A, that time drops to
about 40 minutes at 150A and 13 minutes at 300A. It's pushing the 3,400
pounds of car up the hills that eats into my range.
Look at the EV Album (www.evalbum.com) and search for trucks/pickups.
You'll see what typical conversions are capable of. And remember that
completely draining a battery will greatly shorten its life
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