best Battery for electric car
We were looking at a electric car and it has regular lead acid batterys is there any better battery out there that offers more with out the cost of lithum ones ? what about nickle cadmium , small package seem to work well with battery tools and the price is down there. This thing has 8, 6 volt batterys but only has a 20 mile range.
Specs are 14 hp peak hp
four wheel drive (can be switched out when not needed)
It does have rather large tires (wide) and rolls hard
Would like to get 40 miles to the charge
( does not climb hills very fast )
It the old problem.
Pick any 2
We use alot of GNB brand sealed batteries at work. They might make something that would work.If you check their website.
best soloution all gas engine
+1.....more cylinders = better...
Originally Posted by airsmith282
I have done business with the auto makers for 21 years. The word I am hearing is they are keeping the price low so people will buy the cars. If they put expensive batteries in the cars the cars won't sell.
My cousin bought an electric car and he loves it. I have no idea what he bought he lives 800 miles from me and he never told me which car he bought. He said, I am retired and I can't take the money with me so I am going to spend every penny before I go and I am going to have fun spending it all.
Last edited by gary350; 10-18-2010 at 08:45 PM.
What car are we looking at?
While you could replace the batteries with another type, you'd also need to reconfigure the charging system to match.
Since the 14 HP engine pulls about 10Kw, you are pulling approximately 875 watts per battery, or about 145 amps. Those figures are not exact, since there are many factors that come into play.
Changing to higher voltage batteries will require changing the motor and/or controller, but might give a slightly longer range due to lower losses both inside the batteries and the cables.
To double the range you will need to go to higher energy density batteries or physically bigger batteries. If you look at the charts on http://www.allaboutbatteries.com/Battery-Energy.html you will see that Li-Ion batteries the same physical size as your current batteries will provide 2.3 times the range. The problem lies in balancing the charging and discharging of hundreds or even thousands of Li-Ion cells arranged in a combination serial/parallel battery pack.
The good news about a small battery pack is that it will recharge quickly. 20 miles range is actually enough for MY non-commute driving.
The lead acid battery is not the best, but it is still likely the best combination of price and capacity for most non-custom engineered vehicles.
it's actually a darn good battery, with far fewer downsides in terms of spectacular failure modes, etc, than most others. Tough, easily maintained, easily recharged, etc.
It's heavy, but many other types are not so light..... and have far more troublesome restriction on charging, etc.
As for the system, at 14 HP and 48V DC, it is bound to be limited. Someone mentioned 145A...... with 8 6V batteries, the system is nominally 48V, and 10,000W / 48V = 208 A.
Virtually every electric vehicle these days will have some sort of switching controller to operate the motor. But they do vary in efficiency.
Starting torque is from current, and a good switching controller will reduce the battery current a lot and start the motor with a high current at low voltage.....
The battery losses are related to current squared. At 200A, there are lots of losses all over. Wire, motor, even in the battery pack.
At a higher voltage, the current-related losses can be much less, and it is possible that a different setup could operate the same motor in a more efficient manner and get more miles out of the same total stored power if it were available at a higher voltage/less ampere hours.
A friends neighbor
A friend of mine has a neighbor that has a coverted electric car. If I happen to see him I will ask what he uses. "Does not climb hills very fast". I once had a Rolls Kanardly, (rolls down one hill, can ardly make it up the next) Jan