What % grade would be an extreme climb for an electric?

SAcharlie

Given that a 100% grade would be a 45 degreee angle. Whats the steepist grade that ya made? And how many aboard?

BGW

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scottyb

% of grade is a formula of vertical rise over a given distance This is how grade slope is calculated. The rise in a 45*(degree) slope is equal to the lateral distance covered. 90* is vertical. The 45* slope is referred to as a 1:1 slope and it will pucker your butt going up or down. My 36v cart running on 48v will climb these and with a full charge spin the tires all the way up. On a 2:1 slope (22 1/2*) I can start down and make a U turn on the slope and come back up..... I don't know what a stock cart would do but it would have about 20 - 30% less power...hope this helped.

SAcharlie

So you can climb a 1 in 1 slope...how fast is your cart on level ground...what speed would you say you travel up the 1 in 1 slope. Not that I care about a fast cart...just wanting to get an idea as to speed on level and still able to climb.

BRS

I think anything over a 45 degree incline would be considered extreme, when considering cargo weight and distribution. I would be very careful with a rear seat climbing anything steeper...you could roll the cart backwards with a torque motor at any speed on that kind of incline. I've climbed plenty of 45 or better inclines...but I won't let anyone ride in the back and I don't have a torque motor, but my torque is still double that of stock, but I'm not spinning tires,...not even one.

scottyb

I think it went about 20mph on flat ground. I will have to GPS it when it comes out of the shop here shortly.....I was always too buzy hanging onto the wheel to GPS it on a big slope!

SAcharlie

I got a tiltmeter and went driving around some county roads along creek bottoms. I didn't find any over 20 degrees/~45% but they sure looked steeper.
I've been concerned with the high speed 10.31:1 H-12 diff I picked up. But seeing that some are climbing 45 degrees guess it won't be a problem. Looking at using a torque motor anyway.

Nate

As steep as you can go without flipping over. A torque motor will loose traction before stalling.

SAcharlie

Nate in case ya missed my post on another board Eric Dieroff at D&D gave me some rpms at amp draws I asked for on the StealthStalker 4:1 motor.
These are at 36v.
400amp/690rpm/7.95hp
500amp/540rpm/8.40hp

Thats some torque...ha.

Nate

Charlie, let me get this straight, if you load a StealthStalker to 690 RPM but maintain 36 volts it will produce 7.95 HP but draw 400 amps? Did they use batterie which would have a voltage sag or a power supply which can control curent? How long can the motor be run like this before it reaches a set temperature like 100C on the case and what was the start temp?

You have good numbers and I am not challenging you, I hope to educate others to know what questions to ask when they challenge a manufacturer, this way we will be able to truly compare motors and which type will fit our personal application.

SAcharlie

Nate no challenge taken. Just after all the info I can gather thru discussion. I emailed D&D asking at 36v what RPMs this motor turns when it pulls 400amps and 500amps. Now I wish I would have asked for 48v also. I wish we could get the mfgs to state info like that, which would match the available controllers; ya know like 300amps, 400amps, 500amps and so on. Thinking maybe D&D would be willing to do this if they ever read the forums.

As to power supply...didn't think to ask. But was just recently wondering about voltage sag. I realize that sag comes into play like say ya have a 48v pack and you pull huge amps...you don't see 48v but maybe 46v or something.

My ? is do you have a voltage sag if you have a 72v pack but are only throttling for 48v speed with huge amps.