I found one or two Chinese ones that did, but while their electronics were sufficient, their LEDs, optics, and thermals were… Disappointing.
I ended up going with an aftermarket automotive sealed low-beam projector headlamp (what a mouthful lol) and a drop-in LED replacement lightbulb to match.
84V is in a weird valley of no-parts. Go a few cells’ worth lower, and there’s tons of options for golf carts and the like. Go over about a hundred or so volts, and you can use a lot of things that are designed to run on 110VAC mains on the DC bus directly.
The latter. Planning to use a 12S Bluetooth LLT. 20a charge only.
The connector isn’t that great for plugged in while operating. It’s pretty big. I did see a 90* version.
Moliceli lists the standard charge for the 42A as 1C or 4.2A. Even 30q charging at 1a is silly IMO. 2 or 3 amps is probably fine. We do a significant amount of wear damage in discharge too that effects capacity. Understandably staying away from the max 4A all the time yes. But we also have people with 6p 30q packs and now many 4-5p 21700 cells are who are mostly charging at 4A.
If your BMS has C- and P-, then it’s likely (but not certain) that you can draw power from the C- port but the BMS may not be able to shut that port down in case of low battery or short circuit.
It highly depends on how your specific BMS is wired internally, though.
I would not do it from a BMS with a C- port. It’d be much better on a BMS with a shared P- port.
Just tested that theory. Put my undervoltage setting in xiaoxiang 0.02v under my actual cells. Turned my light on for a few minutes and saw the bms cut the power to my light.
I use a LLT bms
I use the same charge port from amazon and charge with 8A since 1 year without any problems. They just get slightly warm, that’s it. Before I had a plastic jack which got quite hot at 4A and melted.
Which port? Which BMS? Details are everything as these tests are only specific to a certain brand/model/configuration of BMS and only for the port tested.
@b264
c- port
LLT 12s 60a bms (bought directly from their website)
Setup as charge only
Could technically use the power port to power lights as the bms would cut it off too
Yup. 84V@6A here, the only issue I’ve had is the little loop for the cap broke off.
I’ll 3d print a little washer with a loop next time I have it all apart.
I considered them, but decided against both of those for space reasons. Plus both of those are rated for dozens of amps, so it’s totally overkill for a 10A charge port.
Pretty much yeah, also pretty much any Aliexpress seller with chargers will let you pick the connector at the bottom of the page if you send a message with your order, works for me every time.
Just received this 8A 12S charger from YZPOWER who I have ordered from before. It came with a noisy fan and my BMS is only seeing 5A from it. More testing is needed, but discussing with the seller now about a replacement
Soooooo random question I dont think we covered. Can you use two chargers in parallel at the same time? Lets say you had positive from battery into the positive of two side by side 5.5x2.1 DC charge ports. Negative of both to the bms. Could you plug two 4 A chargers into each of those 5.5 ports and see 8A of input? I guess the next question is how will it behave as it nears peak voltage.
In my head, I cant figure out whats going to go wrong, but this seems to obvious to be a real option.
