48V to 56V conversion ?

PuttPutt

Hello all, I'm looking for a little more power for the hills in my community. I have a TXT 48 volt PDS, altrax XCT500, heavy duty solenoid, 2G cables, Admiral B2 motor, tires 18.5 tall. I did some searching about adding a seventh 8volt battery to 48volt system and didn't find much. Found lots about adding the seventh battery to 36 volt carts. One post about upgrading to 56 volt I found stated it isn't worth the trouble that the benefits just aren't there. Bummer, so what kind of performance on the hills could I expect? Can the extra battery just be added into the pack or do I have to maintain 48 volts at the solenoid and change the diode? 56 volts shouldn't be a problem for the XCT500 and I know a different charger. So that is a good question. Is the Gain worth it?

BGW

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cgtech

You would only gain 16.66% torque & speed. With the new charger and everything, that's a lot of money for 16%. Solenoid would likely be fine on 56.

PuttPutt

Thanks cgtech, probably best to keep it as is. My batteries should be good for a few more years and then maybe lithium or maybe an AC system project chaching $$$$

JohnnieB

Check with Alltrax for a field map for a B2 motor that is designed for hilly terrain.

I don't know if one exists, but there are several maps out there.

Also, try is with Turbo turned off. That will cost you some on top speed, but might up the speed it slows to on hills.

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Record a datalog and we can take a look at what is happening when cart slow on the hills. Might show something that is easy to fix.

PuttPutt

Thanks JohnnieB, I'll do as you suggest. might be a few days before I get out to do a data log.

bronsonj

I am running lithium at 57v and the solenoid works fine thus far for me. But... your "56V" lead acid system will charge to more than 56V. The highest V I have had my cart at was an accidental 60v and that did not immediately kill the solenoid nor the stock controller I was still using at the time.

Since then I've added safeguards to prevent that high a charge V, but I run 56V to 57V all the time without issue.

100% SOC would be about 59.5V if I did the math correctly.

PuttPutt

Good to know. The more I'm thinking about this the more I want to go lithium.
The weight reduction alone would probably give me the performance on the hills I want.

bronsonj

I have a 3 mode personality switch for me, wife and kids. With the weight loss of Lithium, increase in V max and now I no longer have voltage sag, the cart is a TON of fun. Performance is so much better that I leave the cart in the middle-performance mode on the switch for 99% of what I do.

You can see I upgraded to the 300 amp (360 max) Alltrax controller which is the smallest Alltrax controller you can upgrade to. The reason for this was the stock controller performed great, but I needed the Alltrax to stop the cart at 45.5V (3.25vpc). No way for me to get the stock controller to do that.

The safeguard has proven useful since no matter how many times you tell a teenager that when you see 48v you'd better be headed home, they'll still call you when the cart won't go no mo and it's at 45.5v.

If you go lithium, there is a lot of info available in the lithium link at the top of the EZGO subforum and also in the Extreme DC section there's an All Things Lithium subforum. LOTS of good information.

disland

@bronsonj what kind of top end speed are you getting with a 48V lithium and the 300AMP Alltrax.

I have a 300amp system club car but thought I would need to change out everything (controller, solenoid, motor etc) to go lithium?

Does it being a club car make a diffefrence in lithium performance?

PuttPutt

It always amazes me the depth of knowledge on this forum and the willingness to share that knowledge. I hope to get out and do some testing on my cart tomorrow. My cart isn't a dog going up hill I just want it to go a little better.