01-06-2020, 09:54 AM | #11 |
Gone Wild
Join Date: Jul 2018
Posts: 213
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Re: Anyone tried RoyPow lithium kit yet?
I'm looking at these vs Allied. Comparisons between the 2 and where the Roypow can be purchased would be appreciated. Cart is 2008 CC DS 48v. Used mainly for 1 round of golf in Mtns of NC. Currently US Battery S8VGC (170 amp 8v) which get me easily through 18 holes (when new, now 4 years old barely get home)
Thanks from a newbie who needs "drop ins" |
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01-09-2020, 12:20 PM | #12 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Anyone tried RoyPow lithium kit yet?
Quote:
Maybe I'm missing something, but it sounds like unless you have some hills with some decent grade, or heavy people, or a trailer you're pulling, or huge tires, or a crazy high draw DC motor / Controller - that you might not trigger the current over-limit cut off? I've got the 5KW Navitas and 23" tires, but I also need practical range most of the time, so wheelies and 35mph is pretty much out in that scenario anyway. I just wonder if this battery might be a good "real world" choice -vs- building a leaf pack (which I've already started getting a few parts to do...) Apparently the Leaf pack's advantage (14 module) would be discharge current potential - maybe the only advantage? Seems like most Leaf modules available are used / re-claimed or whatever, and they seem to specify 70% or so of "capacity". I'm not sure if this is # of cycles or AH of a fully charged pack, but if it is AH of a charged pack, and 14 new Leaf modules are in theory 120ah, then 70% of that is only 84AH of storage capacity. The smaller RoyPow is listed as 105AH, and appears to be lighter than 14 Leaf modules (95lbs -vs- around 115lbs I think). A 5 year warranty (if it is actionable by the buyer in a year or two - who knows...) is certainly something to consider as well. The cost of a DIY Leaf with active BMS and all accompanying parts could possibly get north of 1,800 (which as I understand it is the cost, minus installation of the RoyPow 105Ah). |
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01-10-2020, 09:28 AM | #13 |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Anyone tried RoyPow lithium kit yet?
Can't seem to edit my post but the up to or north of $1,800 figure I'm stating for a 14 Leaf DIY pack assumes around $300 in there for a new / fast charger - not one of the $100 ones which will work but might be slower, may not be adjustable (easily) for "full" voltage level etc....
So if the RoyPow needs a new charger also (would assume so...) that would bring the price of the Leaf DIY down a bit in comparison. The other thing I'm unclear on (like there is only one other thing I'm unclear on ...) is max. discharge of the Leaf modules. I realize people here are using them under pretty heavy discharge conditions, and they are working and apparently not exploding, but it seems their rating isn't all that high (if I'm reading the specs right?). I wonder though what high discharge rates are doing to the life or longer term stability of the Leaf modules? The RoyPow apparently has a simple circuit breaker or something (self resetting I guess) that disconnects at some load point, and then presumably reconnects when the condition is not present. Clearly they have set that level for cell protection and to limit future warranty exposure. As the Leaf modules don't have any such protection (and to my knowledge nobody is building anything in other than 400amp fuses in the event of a short) I just wonder if the Leaf modules SHOULD be used with the higher discharge rates (even though they'll do it)? I know very little regarding lithium but it's very interesting to be at this point and getting away from the 100 year old lead-acid battery tech. If anybody can clarify what constitutes acceptable / safe current draw on a 14 module Leaf pack I'd be appreciative for the info. |
01-10-2020, 09:39 AM | #14 |
Gone Wild
Join Date: Jul 2017
Location: West Columbia Texas
Posts: 1,036
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Re: Anyone tried RoyPow lithium kit yet?
I think what has you confused is sustained discharge rates versus short bursts. A 400-800amp surge for 2 milliseconds isn't going to hurt anything. The roypow has proven to put out 400amps in quick millisecond bursts without tripping the built in breaker. This is all the more that's needed to pop wheelies and such. The motor once turning would be very hard pressed to draw more than 250amps. A sustained discharge rate at or over 250amps will definitely trip it. A golfcart under most circumstances will not be able to sustain an amp draw north of 300amps. It's just not possible with the motor sizes we use. With an A2 speed motor on 27in tires at wide open throttle on level ground I was able to get a sustained draw of 280 amps. That's a bad combination of motor and tire size and if I was to hold that power output long enough the motor would melt down.
I believe the roypow cost at 1800 includes a charger. Not sure of its specs tho. In my opinion and experience the roypow setup will provide just as good of performance as a leaf pack if its configured correctly. As far longevity idk that anyone can answer that yet. Only time will tell. Sent from my SM-G960U using Tapatalk |
01-10-2020, 10:59 AM | #15 |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Anyone tried RoyPow lithium kit yet?
"The other thing I'm unclear on is max. discharge of the Leaf modules."
I don't know of any lithium cells available that cannot handle short discharge bursts at 10C. My Chevy Volt pack is 94Ah. So I should be able to handle a short burst of 940 amps *from the battery*. Truth be told that the other components in my cart can't handle or won't pass 940 amps. The cells themselves are not the limiting factor. The other components, cable size, BMS, safety fuses/breakers, etc are what determines the max burst discharge rates. Someone else on the forum was looking at pre-built lithium battery pack to drop in their cart but it stated a 120 amp max discharge burst rate with 80amp continuous. The pack should be fine at higher draws so the manufacturer of that pack used a underpowered BMS. |
01-10-2020, 11:11 AM | #16 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Anyone tried RoyPow lithium kit yet?
Quote:
Not sure I'll be able to buy, try and return if I don't like something about it (Can probably negotiate something fair with the dealer though - he's a nice guy). He's only put them in stock carts, and all has been good in his experience but the owner's of those carts are looking for no maintenance and less rigid charging requirements and a little extra range - not really anything to do with acceleration or speeds. You are correct - the charger is included for the $1,795 kit cost (also all mounting and electrical parts needed to convert). Dealer says 3 hour max charge time, but haven't looked it up to see what they are using. |
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01-10-2020, 11:18 AM | #17 | |
Gone Wild
Join Date: Dec 2016
Posts: 229
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Re: Anyone tried RoyPow lithium kit yet?
Quote:
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01-10-2020, 11:22 AM | #18 | |
Gone Wild
Join Date: Jul 2017
Location: West Columbia Texas
Posts: 1,036
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Re: Anyone tried RoyPow lithium kit yet?
Quote:
Sent from my SM-G960U using Tapatalk |
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01-10-2020, 03:35 PM | #19 |
Gone Wild
Join Date: Jul 2018
Posts: 213
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Re: Anyone tried RoyPow lithium kit yet?
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01-10-2020, 05:46 PM | #20 | |
Gone Wild
Join Date: Dec 2016
Posts: 229
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Re: Anyone tried RoyPow lithium kit yet?
Quote:
After messaging several dealers asking for prices and getting little or no response I finally just called Roypow they referred me to a dealer. If they send it to me I will message you details. Think someone on this site is a dealer also but he never would reply with shipping costs. |
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