Correct,
Adding batteries will always increase the amount of
energy that you are carrying and it is the energy that
gives you range.
You can easily see that from the reasoning that Joe used:
Adding batteries in series will not give more Ah, so he
drew the (false) conclusion that the range will not
increase when the Ah stay the same and only the voltage
increases. But if you look at how a controller works then
you see that the controller will perform a task called
"current multiplication" when the output voltage is
lower than the input voltage, (almost) equal to the
rate between the two.
Eaxmple: 120V and 100A input from the battery pack can
result in 60V and (almost) 200A output into the motor,
to maintain a certain driving speed.
Both are (almost) the same amount of power: 12kW.
Now if two batteries are added to the pack, the same
power is delivered at 144V when the batteries deliver
approx 80A.
This means that each battery delivers less power and
this means that it can deliver the required power for
a longer period, because the total energy contained
in the pack is increased by adding batteries.
Hope this clarifies,
Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
Email:
[email protected] Private: http://www.cvandewater.com
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-----Original Message-----
From:
[email protected] [mailto:xxx
[email protected]] On Behalf Of damon henry
Sent: Saturday, August 18, 2007 8:19 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] battery help
Joseph,
You've been working too hard this summer. Adding batteries and leaving everything else the same will always add range. In fact in the case of lead acid batteries the range can be determined almost exclusively by how much weight in batteries you are carrying. Whether they are in series or parallel makes very little difference.
BTW - I should be down at the track watching the Nedra guys run right now, but it's looking like a possible rain out tonight. I called Wayland about a half hour ago and they had cars lined up on the track trying to keep it dry hoping the rain will pass.
damon> Wait a minute, guys - as has been stated before, adding batteries
damon> will NOT > necessarily give you more range! It will give you
damon> somewhat better > performance, all else being equal. The
damon> amp-hours remains the same for any > number of batteries
damon> connected in series, and the additional weight will > negate most
damon> of the benefit beyond a certain point.> > Batteries connected in
damon> parallel will give more range, batteries connected in > series
damon> will boost performance.> > Joseph H. Strubhar>
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