Recent content by EricBarbour

The "level 2 protection" settings seem off. Set them to overcurrent 120A overvoltage 60000 mv (same) undervoltage 42000mv (4200 is totally wrong) Otherwise I can only suggest experimenting with over/undercurrent and voltage settings to stop the cycling. And make sure your charger isn't doing...

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I've bought a few BigBattery products over the past few years and they have been solid and reliable. (Although granted, I did not seek tech support from them....) A few months ago my email started receiving sale offers from Battery Evo that were full of "apparent" BigBattery products at massive...

Just an FYI, the project was completed, using an A123 battery pack with internal BMS, and everything posted here: https://www.diyelectriccar.com/threads/the-joys-of-repairing-and-upgrading-an-abandoned-corbin-sparrow.209551/ The A123 pack, MCU and charger ended up being far cheaper than buying...

For those who might be messing with A123 packs or EV conversions, I posted a long thread about my project on diyelectriccar.com with photos and videos. Those A123 packs are really damn nice, very solid and reliable so far, and the Thunderstruck MCU and charger work with them perfectly...

I've got a 4000w AIMS and a 6000W Sigineer. Except for the cabinet and an LCD status display on the Sigineer, they are almost identical inside. The AIMS unit died after running for about 4 months, it was sent back and repaired under warranty. I'm keeping it as a backup. The Sigineer has been...

While you folks are talking about unrelated things and posting jokes, this story is spreading online.....it's all garbage coverage, but still, you just know someone will start waving this around as "PROOF" that LiFePO4 batteries are "deadly". Different incident...

Saw that and it's impressive---but gross overkill for what I'm doing. Plus the output isn't adjustable, only for a 300v battery.

This thing is interesting, but maxes out at 85v. Cheap--perhaps I should just buy one and test.

Recently a couple of A123 lithium packs from a Smith electric delivery truck landed in my garage. They are really nice things: built-in BMSes, CANBUS control, and high energy density in space and weight. Disadvantage: odd operating voltages. They are 26S3P with a unique "proprietary" A123...

I can beat that easily. He posts horror stories about China routinely--now that he's out of China. https://www.youtube.com/@serpentza Don't ask him about BYD electric cars, AT LEAST IT'S FUNNY

Okay, aside from communications, ground isolation and other issues, here's two 48v packs with typical BMSes attached. Where would you put the protection diodes? I'm thinking you are talking about putting them between P- and B-.

before someone mentions this: I've seen it, and 120A isn't enough current, so thanks but no https://www.litechpower.com/product-detail/HCX-D575LF30S120A.html Yes I asked Daly already. They can make something for this, but have a minimum order of 25 pieces. The common 16S or 24S 300A BMS...

Voltage monitoring and some kind of balancing would be good. Don't really care about communications, though that is up to whatever battery charger we end up with. Battery chargers for EVs are another costly and weird area. You can easily get a 48v 1kW charger for about $250 but 96v or more, the...

Threads on this forum (some of them very long and ranty) have beaten on that very subject. Apparently "you shouldn't do that" because if one BMS shuts down, it will have the full 96v of both packs across its internal MOSFET switch. If cheap BMSes had facilities to shut each other off in series...