Roypow Lithium Review

[Sergio]

The RoyPow we are talking about is the 51V-105AH and according to the information below it uses 16S1P of LF105 cells:

http://www.roypowusa.com/?page_id=26...0specification

Those cells have a range of 2.5v-3.65v:

http://www.roypowtech.com/upload/201...0110502862.jpg

So the absolute maximum cutoffs are:

Low voltage = 2.5v x 16 = 40v

High Voltage = 3.65v x 16 = 58.4v

If You don't have a BMS the settings Alltrax recommends would likely cause damage to the cells.

If You have a BMS and it is properly configured, the settings Alltrax recommends will cause the BMS to shut off during Regen and it could shut off during drive and that can damage the controller.

I have no idea why they would recommend setting the Controller voltages in a way that would force the BMS to trigger, perhaps they think you are referring to Lead Acid batteries or they don't know you are talking about LiFePO4 chemistry.

[Zeusmotorworks]

I’m not smart enough to reason why, but we were specifically talking about this battery when he made the comment that the settings were fine. For yourself and others, I’m inclined to take your advice, because they are a controller company, at least not at this time a battery company if that makes sense to other readers.

[Haddixbros]

For all those concerned about battery output, I have a ginormous cart with a Plum quick high amp motor and an alltrax 600 amp controller. I have had zero issues with amp output. The battery has done just fine. I pop wheelies all day. And I have the 56AH pack. These packs will out perform what theyre spec sheets show. My graphs at the beginning of the forum will show that. They spike at 600 amps, and thats because my controller stops it there

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[fstop]

Originally Posted by Haddixbros

For all those concerned about battery output, I have a ginormous cart with a Plum quick high amp motor and an alltrax 600 amp controller. I have had zero issues with amp output. The battery has done just fine. I pop wheelies all day. And I have the 56AH pack. These packs will out perform what theyre spec sheets show. My graphs at the beginning of the forum will show that. They spike at 600 amps, and thats because my controller stops it there

Sent from my SM-N960U1 using Tapatalk

Glad to hear the pack is standing up to all that!

No issues with mine, but I'm easy on it though.

[Nolagt]

Originally Posted by Haddixbros

For all those concerned about battery output, I have a ginormous cart with a Plum quick high amp motor and an alltrax 600 amp controller. I have had zero issues with amp output. The battery has done just fine. I pop wheelies all day. And I have the 56AH pack. These packs will out perform what theyre spec sheets show. My graphs at the beginning of the forum will show that. They spike at 600 amps, and thats because my controller stops it there

Sent from my SM-N960U1 using Tapatalk

Thats good to hear. I have no idea if/when I would swap controller or motors...but id hate to be limited by the expensive lithium batter I got lol.

[astang70]

Originally Posted by Haddixbros

This has been a long awaited thread.... I recently purchased a Roypow Lithium 51V56AH battery pack. I spent $1411 total to have it shipped to my door (2 day shipping too!). That included the battery and mounting brackets (which haven't arrived yet, but I made a temporary install mount).

Here is the short story of this thread: If you are not desirous of doing a leaf kit build, this kit is ABSOLUTELY WORTH THE MONEY. However, I am a man of science and I am going to give specifics on why, including graphs and real data collected from my cart. These will be included in a google drive link, as I cant figure out how to add word or excel files on here.

To start off, I'll say the buying/shipping was a breeze. If you're on the east coast, call Mike at Lanier Carts and Outdoors in Oakwood, Georgia (470-252-5622), and tell him the Kentucky guy sent you. Packaging was strong and sturdy but easy to open.

The only downside thus far was the install. I have 1999 EZGO TXT series. The battery tray for this has two tabs designed to hold the battery hold downs. This made it impossible to lower the Roypow in. So I cut them off. I guess if I ever sell this thing and put in FLA batteries, I'll re-weld them on. However, thats a MINOR inconvenience for what I got out of this pack.

After hooking everything up and securing it to the cart, I began my testing (I did my FLA tests prior to this, obviously). My first impression was "WOW THIS THING IS TORQUEY". In fact, it was so torquey that it caused my cart to do a 1-2 inch wheelie. Which is even more impressive when you consider my cart has a chopper stance to it (pics will show that soon).

It pretty much performs exactly as I imagine a leaf kit would. My only concern (at first) with this pack was the amperage it could put out before the BMS shuts it down. From what I can tell, that limit it pretty high, as I put this cart through HELL. The graphs I attach will explain further. I have a REALLY steep hill (its gotta be close to a 45 degree incline) near me that I used to draw as much amps as possible. It climbed it with ease and only slowed down to like 2/3 top speed. It was amazing. Top speed also went up 3-4 mph. Im gonna credit that to the weight difference.


While I could type forever about the goodness of this pack, Im gonna just leave some graphs and tables attached, and let you guys ask some questions! Information on cart is provided on the table attached. Thanks so much!

*Also, for the file names, "FG" means "FLAT GROUND" and "CH" means "CEMETERY HILL"*

https://drive.google.com/open?id=1QK...CQinduapNSjvqF

How has the RoyPow been doing so far. Any complaints I’m fixing to purchase one for my CP. thanks.

[astang70]

Awesome!! I just picked up the RoyPow 160ah. Thanks for the reply.

[Zeusmotorworks]

Must say I'm happier by the day with my 51v 105ah... should have done it sooner! Don't track miles but use mine daily and charge maybe once a week... maybe.

[anpgator]

Really enjoying my 56ah pack in my mostly stock DS. If I had to nitpick I would say the discharge indicator bars drop a little more conservatively than what is probably true. After about 14 miles with 2 bars left I’m still over 52 volts.


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[Nolagt]

Originally Posted by anpgator

Really enjoying my 56ah pack in my mostly stock DS. If I had to nitpick I would say the discharge indicator bars drop a little more conservatively than what is probably true. After about 14 miles with 2 bars left I’m still over 52 volts.


Sent from my iPhone using Tapatalk

I could be wrong but I don’t think lithium’s drop volts like a led acid battery. I think it more falls off a cliff when it gets low. I’d like to keep my digital volt meter when I swap to lithium but I don’t know how accurate that will be. You can discharge lithium to 20%? Is that still 46.63v like a acid setup?