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Again, the help. Thanks. I killed the overkill app, because it was paired with the bms and would not allow another app to pair. Then went back to the newest blue elephant version. Repaired and success!!! It allowed parameter changes and displayed all the information I need. So I am happy...

Well, good news and bad news. Overkill app can connect, I changed the parameters on my battery, but Overkill app will only display some features. NOT the individual cell voltages. NOT the temperatures, NOT the the power or voltage of the pack. It CAN connect and I CAN change the parameters...

THANKS!!! Dude, you are AWESOME!!! That was exactly the problem. The per-cell voltage protections were correct, but they were times 13. The BMS will control a 7 to 13 cell battery, and it was supposed to "auto-detect" the number of cells. Well, it may auto detect, but it didn't set the...

So, I disconnected the BMS and reconnected it. Again, Overkill can connect. There is one alert for BMS undervoltage. Again, the battery has 26.8 V, but output of the BMS is 3.77V. Not sure what's happening.

There are really only 2 connections to the BMS: the B1 and the sense wires. The youtubes I've seen also show the B- first, then the sense wires. Its a BMS that can do from 7 to 13 cells. So, 8 to 13 are combined and tied to the 8th +. I'll tomorrow reconnect and see if it helps. I have a...

I actually didn't do anything between charging and measuring 3.77V from C- to Batt+. Then I tried to put it into the vehicle to see if it would provide power under load, and it did not. Vehicle did not recognize the battery. I just did disconnect everything. Actual battery voltage (batt- to...

I built a LIFEPO4 battery. 8 32A cells and a JBD BT BMS. Hooked it up. Got 26V across the battery. Each cell was within .01V+- of 3.24. Charged it up with a LIFEPO4 charger. It appeared to charge correctly--at least the charger did not complain. However, when I put a meter across the...

Which reseller, if you don't mind me asking? And did you find them on the alibaba site or elsewhere? Sounds like you have this stuff figured out.

Sorry. Newbee here. What is DDP?

Alibaba is designed to ship to businesses, not individuals. They have decent prices, but shipping is a PITA.

Thanks for the input. You seem like a man after my own heart-- I love to overengineer everything. If one will do, I prefer 3. But one guy put in 230Ah LIFEPO4 batteries and got 100 mile range and 35mph max. I think a fraction of that would be fine for me. BTW, Dakota is selling two options...

OK. That's good information. Why? They guarantee the delivery.... I've done it with no problems. I'm not being combative, newbee trying to learn.

Kewl. Aliexpress seems to have shipping as a loss leader, often free. At $39/cell, right in the ballpark of $500 +- for 12 cells.

Thanks for giving me some idea of prices for legitimate batteries. So, for $140/KWH I can get legitimate LIFEPO4 batteries? If so, 100AH at 40V (a nominal 36V battery) its about $560? These would be decent? E.g. peak discharge about 3C, continuous 1C? Hopefully new, Class A? If so, I may...

OK

Thus keeping power the same..... Thanks......

I found some nice Aliexpress 100AH 1C discharge rate for under $300 for 12 cells, free shipping. Found $544 for 12 200A cells. But no mention of peak discharge rate. JBD 300A smart (bluetooth) BMS is insanely cheap at $60, free shipping. I was looking at 30A Daly bms and a contactor to hold...

I'm on a budget. Entire golf cart cost me $600. I upgraded the controller and throttle for $150. Many of the cheaper Chinese cells don't have ratings for peak output. Any guess what to do with those? I've seen some with 1C continuous rating but no mention of peak rating.

I have a golf cart, 36V 2.5HP (1850Watt) electric motor, 500 Amp controller, and want to replace the lead-acid with LIFEPO4 DIY battery. I was hoping 100AH cells would work. However, I measured the amp draw under various conditions (all 2 passenger, with the heavy lead-acid batteries, so...

So, for what its worth. I bought the clamp DC amp meter Kaweets. Club Car, lead-acid 36 volts 2.5HP series motor 1985. A variety of tests with heavy old lead-acid batteries and new controller and throttle and 2 passengers. Measured max of 293 amps going from a dead stop, full acceleration, up...

Very Nice!

It is an awesome build. I love the frame work you did. Mine was a lot of aluminum, so didn't face quite the rust yours did.

True. Previously, with my used lead-acid batteries and resister toaster coils, I was charging every other day and had maybe range of <1 mile. Getting a true controller has already helped to weekly charging. Putting in LIFEPO4 batteries of 50 or 100 AH should make it much more usable. Just...

Wow. Great. Sounds like a design target of 100Ah batteries would work fine. One poster had 230Ah batteries and got 100 mile range from them. I had initially thought about 50AH batteries, but prices seem attractive for 100AH batteries.

That is hugely helpful!!! Its a similar motor and similar situation. The EXGO and Club Cars both had similar power, series motors back in the day. Thanks!!!! I'm thinking if I am at about 150A, that is well within 100Ah LIFEPO4 batteries. At 200A, not so sure..... What AH Li-ion do you have?

Thanks very much. I believe I'll see less than 50A in level ground. My max speed is about 12mph. Based on your 225 max with a much bigger motor, and other posts I've seen, I suspect max of 150A-180A or so for me. I saw a post with a clamp meter, Kauweets HT206D that showed max DC amps. They...

Thanks. I have a 36V old 1985 Club Car (2.5HP 1850W series motor) and have been incrementally upgrading, on a budget. I only use it around the property to haul mulch, visit neighbors, etc, don't need faster or >10 mile range. I put a Curtis controller and PB6 throttle. Want to build my own...

So what coulomb meter did you install?

Seems to me that six 6V lead acid golf cart batteries are 200AH, but shouldn't really be discharged to under 50%. So I'm thinking 50AH Lifepo4 cells would be absolute minimum and 100AH would be pretty good. A 250A BMS would perhaps be OK? A 250A 36V Daly BMS from aliexpress is under $200 and...

I think the numbers are way off. On a 36V older model, one guy measured peak amp draw at under 200amps. Most recommendations on motor controllers are for 300A, maybe even less. So for an older 36V unit, I'd say 300A draw is a reasonable absolute max. With #4 cable, can't draw that much. And...

Bump. Did you do it? How is it going? I have a 1985 36V CLub Car and the batteries are shot. Looking to replace with Lifepo4 batteries. I wonder at the max BMS current. Thinking 300A? Though from your numbers, maybe 200A would work? Huge difference in cost as amp ratings go up on BMS's...