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Q: How much does it cost to run an electric car compared to a gas car.

A:
1.

If you are getting 20 miles per gallon at $3 per gallon and you go 30,000 miles you will spend about $4,500 dollars for gas alone. If you average 30 miles a day at 60 cents per charge for three years about 30,000 miles about $600 and then have to change your batteries for $1800 dollars you will have spent $2,400. Figure in that electric motors are not running when you are at traffic lights or in traffic jams so you are not spending energy when standing still. You will not have to change oil or spark plugs every 5,000 miles and the electric motor can last ten times longer than a gas engine. So drive on to 150,000 miles about the life of your gas engine you will spend more than $22,500 in gas alone compared to less than $12,000 in electricity and batteries. This is enough to pay for your conversion and your electric motor is still good while your I.C.engine is junk.
Q: How much does it cost to convert a gas vehicle to electric?
A:
2.
It depends on the vehicle you are converting and the performance you need. Are you going AC or DC power, using new or used parts? At this time GREV is only working with DC. AC is just too cost prohibitive for us. The basic components are: Motor 48 to 350 volts $200 to $7,000, Controller 400 to 2000 amps $500 to $5,000, Batteries Lead Acid 6 or 12 volt or exotics in a 48 to 350 volt pack $200 to $20,000. Conversion Packages
This should give you an idea of just how varied this answer can be.
Q: What is the best vehicle for a conversion?
A:
3.
A manual transmission is best as an automatic requires that the motor run continuously and waists alot of power. We always have to ask what you need this vehicle to do in terms of speed and range. A rule of thumb is 500 to 1000 pounds of lead acid batteries will give you the range of a gallon of gas. Weight is a major factor, for more range and speed a light sturdy car or truck is best. You have to look at the spaces for batteries. Unless you are using one of the highly recommended Mike Brown kits for the Porsche 914 or VW Jetta it is pretty much a custom job that will require some engineering and machine work on somebody's part.
Q: Can I run my motor without it being hooked to the car?
A:
4.
Yes, its a good idea to test out the motor. Care must be taken not to "over rev" the motor. 24 volts could be over the limit. Electric motors run quiet; you will not hear its power. Know your motors capacity. Without a load on the drive train your motor could be throttled to high RPM beyond its capacity, upon acceleration the motor could break apart, throwing dangerous metal fragments at high speed in every direction. At 18 Volts the 9" will rev to about 3,000 rpm and will pull 50 amps. If the motor has advanced timing, you can check to make sure it is timed in the direction you want it to be by running it one way and then the other (switching the A terminal wires). It will run faster in the direction that it is advanced for.
Q: What type of batteries should I use?
A:
5.
The type of batteries you use will depend on the performance you want.
We use Lead Acid Batteries; they are affordable and readily available.
There are many ways to configure battery packs.
You will have many questions concerning batteries so in an attempt to answer most of them here we offer these comparisons.
We offer these three 12KW 120 volt battery packs as hypothetical examples for the same 3,500lb vehicle with the same motor and controller.
20 * 6 volt deep cycle golf cart batteries with water levels to be maintained; this pack might weigh about 1300lbs and cost about $1,800. If you keep the water levels up and don't over charge or go below % 50 discharges too often this would be averaging 20 to 30 an occasional 40 miles a day they should last 3 to 4 years.
25 * 12 volt AGM (Absorption Glass Mat) sealed maintenance free batteries also weigh about 1300lbs but cost about $4,800. You won't have to worry about fluid levels but you still have to be careful not to over charge or discharge to much and you should be able to get 3 to 4 years out of them. We do not suggest anyone purchase Lithium batteries unless you have money in your budget to risk on research and developement. Check out the: WFFC Battery Show Down

Battery Type

W*Hr/ Litre Watts/Kg Life (re-charge) US$ / Watts
PbO2/H2SO4 65 35 400 $0.16
NiCOH/KOH/Cd 150 60 500 $0.96
NiCOH/KOH/MH 170 70 1500 $2.00
LiCoO2 120 100 500 $1.35
LiMnO2/LiBF6/C 200 200 500 $1.09
LiFePO4 TS-LFP 330 720 1100 We will let you know
Q: How do you calculate how many batteries you need?

A:
6.
You have to give your acceleration, range performance and budget requirements first.Let's start with the voltage of your system. This would be determined by the controller you use; check the nominal voltage. Higher the voltage and amperage the more power the vehicle will have. Then divide the nominal voltage by the size battery you will use; 6 volt, 8 volt or 12 volt. This is the number of batteries you will run in series. The higher the amp hours the greater the range. If you want to double the number of batteries then you would buddy up two in parallel and then run the pairs in series. You also have to consider space available and the weight that your motor, controller and suspension can handle.

Q: How do I hook up the air conditioner ?
A:
7.
Steve usually puts a pulley on the end shaft but if you don't have a end shaft or enough room you will need to fit a small electric motor to operate the compressor.
Q: Can Grassroots Electric Vehicle Company be “commissioned” to do a conversion for me?
A:
8.
We do help people get conversions done. See our Grassroots Electric Vehicle Conversion Shops Directory. Professionals experienced in converting gas vehicles to electric, willing to help you. Shops get $25 to $250 dollars per hour depending on the caliber of your project. Experienced technitions get a consultation fee of $25 per half hour.
If you would like to schedule a tech to call you back to help with his undivided attention call Jon at:702 277-7544
Q: What voltage motor do I need?
A:
9.
I would have to ask you; what kind of load are you going to put on the motor, and at what RPM will it be running? Then I could tell you what voltage controller you should use. The controller correctly matched to the motor will give it the right voltage. The weight of the motor magnets and size of its brushes determine the power and torque.The rpm rating for the 9" and 11" motors is 5000rpm and they are happy to spin this fast; so that if you hook them up direct to your differencial and you have enough power at 5000rpm you would go over 100mph; 60kilowatts
Q: So, what voltage would you recommend for a normal car?
What controller would you use?
A:
10.
In general; I put as many batteries in as possible. The Zilla controllers are the best dc controllers on the market and they come in 3 voltages 156v, 300v and 348v at 1000 or 2000 amps. As distance is related to weight of batteries, golf cart batteries give lots of weight at 65lbs each. You get the most for the money but it is hard to get the voltage high when you need 20 of them, just to get 120 volts. Of course 12v AGMs give you twice the voltage for the same number of batteries and they come in smaller sizes so with them your voltage can be much higher, all the way up to 348 volts as the controller is rated it will smartly give the motor as much voltage as it can take. AGM batteries are also happier delivering hi amps and can put out 5 times the hp per pound. Their higher price, usually more than double that of the 6 volt golf cart batteries is what keeps them from being the all-around winner.
Q: What Horse Power is my electric motor?
A:
11.
Peak Horse Power is mostly a marketing gimmick used for IC Engines
it should not be used in reality since it is much higher than "true continuous HP"
Voltage:
Full Load Amps:
Efficiency:
 
True continuous Watts:
True continuous HP rating:
Q: Were do you plug your EV in?
A:
12.

This depends on your vehicle and charger. You want to plug in when ever possible at the nearest available outlet. At home you should have a 240 volt outlet like for the dryer or air conditioner, you can have one put in a convenient location. You want to draw as many amps as safely possible, 50 amps would be great.The PCF20, PCF30 and PCF50 are Extremely versatile battery chargers, designed to charge any battery pack from 12 volts to 360 You should be able to plug into 110 at remote locations without drawing to hot of amperage or you will trip your friends breaker. Most 110 outlets will let you draw about 10 amps, but not all. Before you plug in, you should let you friends know you might trip the breaker to find out if this would be a problem if they have to reset the breaker. When you own an electric vehicle every trip must be planned so that you will have enough time and juice to get to your next charge.

Q: What is an electric vehicle contactor? and do you think I need one?
A:
13.
The contactor is like a big relay , it disconnects the power from the batteries to the controller , and can handle all the power that comes from the batteries . If there is any problem opening this will disconnect power from controller and motor . It runs from the 12v supply battery
Q: Why won't a generator on the wheel work in an electric vehicle?
A:
14.
A generator takes more power to turn because of electromatic flux, friction and extra wieght then the power it generates; otherwise it would be perpetual motion. Regenerative braking; utilizes the motor by converting the motor into a generator and utilizing the electromatic flux for braking.

Grassroots
Electric Vehicles

Fort Pierce Florida

Grassroots
Electric Vehicles

Las Vegas Nevada
Ph#:772 971-0533 Ph#:702 277-7544