Roypow S51105 Lithium Battery Review

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  #1  
Old 12-07-2020, 05:37 PM
Footer Footer is offline
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Default Roypow S51105 Lithium Battery Review

I have a 2011 EZGO RXV. 3 years ago it came with 4x12V Trojan batteries. I was down to 15 miles range (from 20 when new) so I had a Roypow lithium battery installed 4 weeks ago. S51105 - 51V, 105 Ah, 5.3 kwh.

I heard about Roypow from the Buggiesgonewild forum. Tried to find a dealer, and finally connected with STM Golf Carts in Ocala. They have installed quite a few of the 56AH batteries, which are fine for the smaller communities but not good enough for The Villages. The Roypow website says 20-30 miles for the 56AH battery and 40-50 for the 105AH battery.

The 56AH battery is 19 pounds lighter and $600 cheaper. Anyone in The Villages needs to get the 105AH battery.

I had a speedometer installed by Jack, the guy who advertises every Monday in the paper, so I have a really accurate odometer.

The battery beeps 10 times when it reaches 20% capacity. Both times I had gone 53 miles, which works out to 66 mile range. Currently I'm at 44 miles with 4 bars showing which means I am between 30 and 40% capacity. The battery meter is reasonably uniform. I go from 6.5-7.1 miles before it drops 1 bar.

I have not gone more than 56 miles yet. Haven't had the opportunity. Battery will beep 10 times about a mile after it's down to 20%, then again in 2 miles.

Installation kits are available for the popular carts, which consist of the support tray and the power connector to the cart, which you can see in the pictures below. STM always has the small batteries available. Mine was only the 2nd 105AH battery they installed. Both the power cord and the cord to the cart are 9½' long.

The Villages Golf Carts offer a 120AH lithium battery for the EZGO carts and expect 50-55 miles range. I haven't read any reviews with actual range. Earlier this year it was a $4000 upgrade for lithium. Cart World charged a $2000 premium for a small lithium battery in Club Cars.

I have a previous post on the Evolution with a larger battery. It just goes to show you can't judge a battery by the Amp rating alone.

I took 4 hours to bring the battery up to full charge after going 56 miles. The charger output is 1300 watts so the input is probably 1500 watts. 1500 watts x 4 hours x $0.11 /kwh = 66 cents to go 56 miles, or 1.2 cents/mile. (1.5 if you use over 1000 kwh a month). By comparison, the power cost for my Tesla is 3.7 cents/mile.

Cost for my battery was about $2550 all in - battery, charger, and battery meter installed.

I can tell a difference in braking with 300 pounds of battery weight removed. I think the suspension works a little better too. Acceleration is quicker but top end didn't change, since that is set not to exceed 20 mph or so.

Bottom line: I am very pleased with the battery and also STM Golf Carts.
Attached Thumbnails
roypow-s51105-battery-jpg   battery-indicator-jpg   charger-jpg   charger-back-jpg  
  #2  
Old 12-07-2020, 09:43 PM
Robbie0723 Robbie0723 is online now
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Nice!
  #3  
Old 12-09-2020, 06:34 AM
MorTech MorTech is offline
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1.58 ah per mile. Very efficient. 230A motor controller?
  #4  
Old 12-09-2020, 06:41 AM
Garwood1 Garwood1 is offline
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Interesting, I have a new prototype solar unit on my cart that is in testing but is showing almost 100 watts produced an hour which leads me to think with those batteries and that unit I could have extremely good range
  #5  
Old 12-09-2020, 06:46 AM
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Arctic Fox Arctic Fox is offline
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Thank you, Footer

What length warranty comes with the battery?
  #6  
Old 12-09-2020, 07:25 AM
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Quote:
Originally Posted by Arctic Fox View Post
Thank you, Footer

What length warranty comes with the battery?
5 years.
  #7  
Old 12-09-2020, 07:49 AM
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Quote:
Originally Posted by MorTech View Post
1.58 ah per mile. Very efficient. 230A motor controller?
Bought the cart from TV golf carts in January 2018. Looks like a stock controller but I can't find the label.

Another comment I should have made is the acceleration, even with the old batteries, is better than the new EZGO carts with lithium batteries. Test drove one at TVGC. Maybe they just adjust the speed controllers for slow acceleration.
  #8  
Old 12-10-2020, 02:49 AM
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Maybe EZGO limits the acceleration in their lithium carts to limit current in order to extend range...Or maybe the Samsung SDI pack has limited max discharge current.

Taking 300 lbs of battery out of a cart helps efficiency...The EZGO RXV has an efficient AC motor and controller. I use 2.0 ah per mile with AC carts as a guess. Mine is about 2.2 ah per mile but I have it set for 0-20 MPH in just under 5 seconds which sucks a lot of current, even with the AC motor. Me likey immediate throttle response over range.

Thanks for the review.
  #9  
Old 12-13-2020, 08:37 AM
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A small update. On my last tank I went 55 miles before reaching 20%, translating to 69 mile range. I charged the battery for 3 hours and 15 minutes before I had to unplug it to go somewhere. Lights were still flashing like it was charging but when I unplugged the battery was full, so it seems that they will keep flashing for a while even after the battery is fully charged.

So the new math is 58 volts x 22 amps x 3.25 hours = 4.15 kwh, which is 78% of the 5.3 kwh battery, so that makes sense. Input power to the charger was probably 4.6 kwh or about 51 cents. Less than a penny a mile.

Charging adds 17 miles each hour.
  #10  
Old 02-01-2021, 07:45 AM
pafinkel pafinkel is offline
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did they have to unhook the computer and did you get a postive and a negative cables in kit
  #11  
Old 02-02-2021, 08:00 AM
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Sorry. Don't know what came in the kit and what STM supplied extra. I don't believe they did anything with the speed controller. The cart reaches the same maximum speed as before, just a bit faster.
  #12  
Old 02-15-2021, 09:13 AM
Tyrone Shoelaces Tyrone Shoelaces is offline
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Thanks for this information.
IMO. In 5 years there will be more electric than gas carts.
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