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Unread 03-08-2019, 12:48 AM   #1
Not Yet Wild
 
Join Date: Feb 2019
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Default New Crowns or used Trojans for 36v to 48v conversion

I'm converting my 1995 medalist to 48v. It has an Alltrax SR48500 controller and a D&D 170-004-0001 motor. The cart has a set of 2016 date 36v powertron's with maybe 50 cycles on them.
I can purchase a set of Crown 8v's for $499 new or a set of Dec 2015 used Trojan 875's for $200 (they have a 30 day warranty). Both require core exchange.
This is a hunting buggy so I don't put a ton of cycles on the batteries which is why I'm thinking the used batteries may work fine for my needs. Any opinions on the matter? I was thinking of taking a HF tester with me to pick out the best used ones if I go that route.
Here is a picture of the used batteries, they have several sets.
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Unread 03-08-2019, 01:03 AM   #2
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

I don't really think those Trojans are the value they might appear to be. The auto-fill caps lead me to believe that they are likely fleet batteries that have Plenty of cycles on them. And the HF tester isn't capable of doing anything more than identifying "the worst-of-the-worst", and can't do much to help you pick the best of the batch to put together. Also, using the HF tester on a good battery that's at 65% charge might look the same as a much worse battery that happens to be fully charged when you tested them.
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Unread 03-08-2019, 05:22 AM   #3
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

They definitely look like ex fleet batteries to me too. Funny thing is, i have three pallets just like that in my workshop right now ready to go for scrap value. I would steer away from them as you have no idea as to their history and as cgtech said, testing them may well give what seems a good reading, but might just be surface. Those in my shop. half of them test fairly good, but will not even do a nine hole round. Maybe worth a shot at two hundred, then save up for a new set to replace them as soon as you can.
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Unread 03-08-2019, 08:26 AM   #4
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

FIRST OFF..…. we are somewhat of the same mind.....YES I too am a Navy Nuke. What was/is your rate? I was a MM.


back to your question.....I too would go with the NEW batteries. I am running the same controller as yourself, but a few other goodies, you can see it all in my sig at the bottom of my post.



and seeing as how this is your first post...… Welcome to our happy little corner of the net, and to BGW. There is a BIG fridge on the back porch with anything you can think of in it...help yourself...of course only take what you can LEGALLY have. Make yourself at home on one of the big fluffy couches, kick your shoes off, put your feet up on one of the tables, yes we are allowed to do that, mom's, wives’, husbands, girlfriend’s and boyfriends here don't care....and take it easy.



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Unread 03-08-2019, 09:49 AM   #5
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

Crown is a fairly good battery. I would definitely go with a new pack versus a 4 year old pack.
I recently purchased a pack of exide brand batteries for about the same as the Crown you are looking at. So far, so good.
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Unread 03-08-2019, 09:59 AM   #6
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

My first Exides that were somewhat abused by PO lasted nine years, though really slow up hills.
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Unread 03-08-2019, 10:24 AM   #7
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

Since you have a hi-torque/lo-speed D&D motor (+40% torque and -15% speed) and a 500A controller, you'll need a 48V battery pack that will deliver a lot of amps, so used batteries and economy grade new batteries are probably not the best choice.

A 48V battery pack made up of 170AH 8V batteries has roughly the same storage capacity as a 36V pack made up of 225AH 6V batteries and Crown has three grades of 8V cart batteries.
CR-150 = 150AH
CR-165 = 165AH
CR-190 = 190AH

Which model Crown 8V battery is the one being sold six for $499?
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Unread 03-08-2019, 01:00 PM   #8
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

Quote:
Originally Posted by JohnnieB View Post
Which model Crown 8V battery is the one being sold six for $499?
They're probably the CR-150's at that $. I can get them for $559 out the door, $650 for the CR-165.
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Unread 03-08-2019, 07:56 PM   #9
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

Personally I would go new for that price
Used batteries are a gamble and unless you could fully charge them then load test. Really donít know there condition .
New Batteries with same date code are the way to go.
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Unread 03-09-2019, 08:28 AM   #10
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Default Re: New Crowns or used Trojans for 36v to 48v conversion

Quote:
Originally Posted by Sir Nuke View Post
FIRST OFF..Ö. we are somewhat of the same mind.....YES I too am a Navy Nuke. What was/is your rate?
I was an Sub EM. So DC motors and batteries are familiar to me, albeit much larger motors and batteries.

Iíve decided to steer clear of the used batteries. Now deciding if I want to go with the crowns or just spend the money on Trojans. I donít really need super big capacity in a battery, but I do want one that can provide sufficient amps to the motor.
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