I ordered a BMS (60 volt) and a lead acid balancer 60 volt.
We agreed the lead acid balancer would ship later
got the bms for TS cells, it was a 16 and a 8 unit bolted together for 20 cells
hooked it all up and it did something....
did extensive testing and found some cells were moving amps to balance and other weren't, isolated it to one board was balancing the other wasnt, the boards were tied together via two reed relays.
These relays also provided the low and high volt cutout I requested for charger and ebrake.
Found that when a cell hit the ceiling the relay clicked the charger off, then right back on, this pulsing would have worn out my charger, and it allowed cells to climb way past 4.25 due to poor engineering and lack of actual testing ( the charger cutoff circuit turned off at high volts but was not inhibited from turning right back on)
The balance function only moved 0.20 amps max, so even if the charger cutout function had worked, it would have taken sometime for the high cell to drop to the point where the cell should have been re-enabled to allow the charger to turn back on,.
Paco was always nice, in the end he said ship it back and we'll replace it, instead I said make another and make sure it works, and I'll pay half for uit and keep the bad one since he agreed the bad one was defective (this only made sense due to the cost of shipping back and forth).
Keep in mind, I paid up front for the BMS I got and the acid balancer I do not have, and stated I would pay for the replacement unit when it was ready and the acid balancer and it could ship together.
That was about a month ago, I have not heard from Paco since, to be fair, I have not pinged him either but perhaps I should.
In the end however, his BMS for TS cells is not going to move more than 0.20 amps which is going to fall well short of what is required, which is why I have created a single cell 10 amp capable unit that bolts direct to the cell itself without increasing the height and have paid little attention to Paco's product as mine has tested on two cells and does all I need, stops the bike on low voltage, stops the charger on high voltage, and can dissipate up to 10 amps at the cell.
My unit is going into proto production and I expect it to be road testing in 4 weeks or less, and I have found two companies in CA that will make the boards and populate them and cut the mini boards out of the main production boards.
Even if I had a BMS, I would add these as a backup, they are N-Scalable and can be used from 1 to infinity cells so no wasted money overbuying BMS units that are tied together in funky ways to make them work.
Would I buy from Paco again ?
Probably, he did ship and I believe that if I ping him he will respond and something will happen with my order.
I am going away for a week so maybe I will cut him a break and ping him when I get back, he could learn something crucial in those 7 days that could benefit my items
