# Is HP BS for electric motors? **URL:** \ **Category:** GEM Forum\ **Created:** [July 31, 2024, 2:13am UTC](https://community.electricforum.com/t/is-hp-bs-for-electric-motors/28145 "2024-07-31T02:13:17Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![sunol](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/sunol/32/16102_2.png) [@sunol](https://community.electricforum.com/u/sunol)\ **Post date:** [July 31, 2024, 2:13am UTC](https://community.electricforum.com/t/is-hp-bs-for-electric-motors/28145/1 "2024-07-31T02:13:17Z")
Just upgraded my 2001 3.5HP motor to the D&D/R4F 7.5HP. Happy with it. That said, I was looking at electric motor specs across various golf carts and it seems like the HP ratings are kinda BS? I mean, you can drive an electric motor hard and get more HP for a short period of time, so are the HP ratings valid? Even at the same RPM, they might take more or less amps to get there and the torque curve might look different. Is there a better rating or do you really need to look across HP/Amps/RPM/Efficiency to get a feel for it? Or is HP stated to some standard and is actually valid? ---
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [July 31, 2024, 2:49am UTC](https://community.electricforum.com/t/is-hp-bs-for-electric-motors/28145/2 "2024-07-31T02:49:44Z")
In most cases it is a universal point in specs where the measure is drafted. Then others might be a little more creative on how and when their stick is measured. Then there are the guys in marketing. ---
**Author:** ![sunol](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/sunol/32/16102_2.png) [@sunol](https://community.electricforum.com/u/sunol)\ **Post date:** [July 31, 2024, 4:18am UTC](https://community.electricforum.com/t/is-hp-bs-for-electric-motors/28145/3 "2024-07-31T04:18:22Z")
I guess what caught my eye were the 10hp motors for Club Car, etc from the same company (D&D). They cost a little less, which is kinda understandable, I’m sure the volume is higher. However, when you compare the 48v curves (to keep things equal) of the two motors, they produce similar HP at a given amperage. Yet the Club Car is a 10hp motor when GEM is a 7.5hp. Just doesn’t seem like a helpful rating. (side note - with the same motor, Club Car can only go 22mph? Tiny wheels and gearing? Not enough available amperage to really use 10hp?) > **[Amazon.com: Club Car Series GolfCar Motor 22mph at 48 Volts 10.1 HP USA Made -...](https://www.amazon.com/Club-GolfCar-Motor-22mph-Volts/dp/B00J2AXSH6)** > > This is a Series Electric Golf Cart Motor Which Mounts to the Stock 10 Tooth Club Car Differential Spline. This 6.7 inch Diameter Blue Club Car Golf Cart Motor Has Increased Copper & Steel Content For Higher Thermal Capabilities. Can Be Used on 36V... ---
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [July 31, 2024, 2:17pm UTC](https://community.electricforum.com/t/is-hp-bs-for-electric-motors/28145/4 "2024-07-31T14:17:54Z")
You may find this topic from the archives an interesting read. > [@The BIG motor Shootout . Which of the high Hp Motors is the best?](https://community.electricforum.com/t/the-big-motor-shootout-which-of-the-high-hp-motors-is-the-best/16064/): > > I’m finishing my latest Gem project and need to decide which motor to run . The big 3 motors are the G.E 7hp , Advanced 7hp (8 brush) and the 7.5hp Rife 4 fun . I have ran all 3 motors but never in the same Gem or with the same battery pack . So i decided to do a comparison of all 3 in my new Gem . Into the parts closet I go . The Gem is a 2014 e4 with 1,000 miles on it . It has a 10.35 trans , 24.2" tall tires and a 27s Lifepo4 battery bank (about 92v) . With a 5hp GE motor it would easily g… ---
**Author:** ![LithiumGods](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/lithiumgods/32/672_2.png) [@LithiumGods](https://community.electricforum.com/u/LithiumGods)\ **Post date:** [July 31, 2024, 9:49pm UTC](https://community.electricforum.com/t/is-hp-bs-for-electric-motors/28145/5 "2024-07-31T21:49:26Z")
There are different ways to rate Electrical motors. If you google service factor you can learn about it. Basiclly it has to do with how much for how long and what parameters to use, The Ride4fun motor made by D&D is rated for 7.5hp, D&d makes a bigger motor that weighs way more but they show it at 7hp. One Big variable for Dc motors is voltage, the higher the voltage the higher the HP. Here is the same motor showing specs for 36v or 48v, same motor. 48 volt (11.4 horse power at 2300 rpm) or 36 volt (8 horse power at 1600rpm). Our Midvoltage battery with a 5hp factory motor will out perform a 7.5hp motor with lead batteries. We have run them at 96v and they are fast. Also motors can be designed for higher rpm or higher torque.