Transportation > Electric Vehicles

E-Bike

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BenandAmber:
EBay has a boost MPPt charge controller and it's probably just the right size for that it's a little green Square I have seen good reviews on it

solarnewbee:
Howdy!

Recently made a battery changeout. The VSLR 12v 70ah were swollen and had been reduced to about 4 kilometers range. Purchased 16 100ah lfp’s $45 each. Haven’t been able to run test yet because of typhoon season and quarantine. My daughter did all the work with me-on FaceTime, really impressed me. The bms was too small since the inrush current exceeded 45a and probably uphill too. Ordered a Daly 100a bms with lcd screen and Bluetooth.

Now to find a way to clamp it all down with the existing clamps. Much smaller footprint and exposed  buss bars. There’s the limit of my daughters skills, maybe. Could lay a restaurant size cutting board across it then layers of plywood. I have seen people use plywood on the buss bars but plywood is not a dielectric. Will check restaurant supply and see what falls out.

Pics of new battery pack, old battery pack, small bms it was only thing available quickly. With all the delays I should have just shipped a Daly bms from AliExpress before. DHL free shipping and it was there in 10 days, pretty impressive for China.

See ya!

solarnewbee:
Howdy All!

So the latest change is a new Daly 150A BMS that can handle the current of the tricycle current.

Unfortunately we found 2 cells were bloated and not a clue why except maybe just poor quality. The voltages were within 10mv of the others. They’re at 3.23v now so I may find the difference spread as they charge. 2 more are one order now anyway. These are 100ah, 30ah more than the old ones and according to the kids it goes uphill without effort now. If those cells overcharged then the cheap bms didn’t stop charging when necessary.

The new bms has Bluetooth so it will be easier to monitor. At $45 each I can’t afford to keep swapping them out. I purchased locally so I hope they didn’t sell me B grade batteries.

Best Regards

solarnewbee:
Long story short, these lfp batteries shown above $#!+ the bed. I had ordered a new charger custom from china and was assured it was designed for lfp’s. Seems the charge absorb stop point was 62v and bloated half the batteries. We now have 4 100ah sla agm. I have a Huwuei server power set at 60 volts going into an old mppt charger. Not quite enough to excite the charger so I added a boost converter and set it at 87v (random) goes up to 120v but wasn’t going to push it. The output caps didn’t look especially healthy. Someday soon they may pop but I have plenty. This charges the larger e-bike. The other charger is a cheap Chinese mppt maybe charger with a 72v charger driving it. This charges the small trike. I encourage the family to plug them in when return from a run. This way they won’t run it below 80% charge often. Those batteries were $500 and I do t want to do that again soon.

Pete:
Hi Solar, I left you a message over on the Back Shed forum about your inverter.
will get back to you on this project later
Pete

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