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that's a good idea. Maybe this winter I'll open them up and perform a different type of cell balancing.

I was away and returned to see this; I switched balance to work when not charging. I'll balance for a few days till the high cells come down and start charging again.

Thanks Mr. S. I was and still am scared silly of those caged electrons constantly looking for a way out. (don't drop the wrench!). I go slow. I learned about magic smoke from 18650s.

I see 90% of battery charge on the BMSs about the time it drops from 40 to 13V. But I really don't know. This is my first build. If I knew then what I know now......

Here's the link (Alibaba). It comes standard charging to 29.2V but I asked for 28V. It starts at 13A then after a few minutes goes to 40A and stays till about 90% then drops back down to 13V. I wish I'd ordered it with CANBUS so I could customize it.

I have a Chinese, waterproof 40A charger that I specified to cut off at 28V. If the batteries are balanced, the charger cuts off before the BMS does.

here's a 1 minute video of the batteries accelerating the boat to full speed and an emergency stop. It's a sailboat but the mast wasn't on for this test. The motor will pull over 100A at 24V when applying full throttle from a stand still. I cruse at 35A which is 4kts. The boat had no motor...

I only charge till Starb #2 hits max so the other cells can get more charge. ok, stopping at 3.5 would prevent me from getting concerned about the growing difference in cell Vs that happens after 3.5v

I envy you guys with accessible batteries. Mine are hidden away

yes it can but Starb #2 is my hot cell and always reaches 3.65 first. I just started charging with 24V. Will post an after pic later today.

yes, it can but #2 cell is always the first cell to break 3.65 even with balancing starting early.

I guess I did. Here's what it looks like now.

Thanks again BB, I set full cell V to 3.650 and now both BMSs are reading 90%. Cheers!

Thanks BB, I'll change the Cell Full voltage. I checked the BMSs and the starb. BMS (the one in the first pic showing 13%) is now showing 91%. I haven't even touched the old iphones I use to monitor or charged or dis charged. (!)

Thanks, I have 2, doing the same thing but to different degrees. Both read 100% after charging but soon after applying a 70A load, they dropped to 39 and 13%. I've had the batteries a year and the BMSs have not had an issue till now.

I should have said that both BMSs showed 100% after charging but dropped to 13% and 34% shortly after apply a test load.

yes but at 13.34V? Yesterday I took the batteries down till one cell got to 2.65. Then I put about 280A (24v) back in. Later I pulled 70A for an hour. This is the state of the pic.

8, 302A cells in 2, 12v batteries, each with a JBD BMS. This configuration is the only way they'd fit in the boat. 302A at 24v.

and one cell certainly is. What would make the amp count so far off?

They were charged and discharged to this yesterday. Balance is set low b/c cell #2 jumps to 3.65v and triggers the BMS.

what's wrong with this picture? Suddenly both my JBD BMSs started giving faulty ah% readings. I checked the config on both. Any ideas on what to check? Thanks, Mack

I bought a Aquamot 2.2 Fixed Pod motor with folding prop for $3k Euros. It included the motor & controller, throttle, battery gauge and cables. Aquamot provides a custom wedge so the motor is level when bolted to the hull. I'm very happy with the motor, it's powerful and quiet. However at this...

Thanks Ken, it's been a challenge. In order for the prop to be protected by the keel, it has to be closer to the surface of the water than is idea. The result is the cavitation you saw. However it only happens when applying full throttle in reverse for an emergency stop or WOT fwd from...

I'm delighted with my CATL cells from Vicky Peng at Basen. I've power cycled them a few times and they actually are 300Ahs. Using 2 inverters, an old hair dryer and a heatgun, I tested at 90A for 1.5 hours with no hot terminals in my set up (after I tightened a loose fitting). The cells are...

I'm looking for a small (less than 4") battery monitor or just an amp gauge. Haven't seen anything on ebay I like. This comes the closest. Any suggestions? Naturally splash proof is desirable.

I balanced, charged and load tested with an old hair dryer on Low. JBD BMSs showed ~ 440w and 30-34amps. Batteries ran for exactly 9hrs before the first cell hit 2.5v and shut down. Both BMSs show a Delta of 0.001 at 88%. I installed the batteries in the boat and tested. Top speed was 5.8kts at...

There were two heavy cardboard boxes by the garage door when I got home. Inside were 8, 302ah Basen cells weighing 5.4kg each. Volts was 3.23 out of the box. The diysolar code got me double bus bars. A carpenters square showed the cells weren't bulging. My Phone won't read the QR codes maybe...

I think GST is already covered. I suspect it's various import fees/tarifs that I'm unaware of.

https://www.alibaba.com/product-detail/New-Lithium-Ion-Vehicle-Mounted-Onboard_1600276370272.html?spm=a2700.galleryofferlist.normal_offer.d_title.731d77faYXyT8o Looks industrial. I need waterproof for the boat. Cheers, Mack

I asked and Vicky said: "When batteries are transported to Australia, we can only provide DAP service, which requires buyers to pay their own taxes."

thanks Bud, I've asked Vicky if my order will be or can be, shipped DDP.

Well, I'm all in, just ordered: 8pcs Grade A+Brand New CATL 3.2V 300Ah 302Ah 310Ah Lifepo4 Battery 24V Solar Cell Battery for solar system from Vicky Peng at Basen. $1,676.25 AUD including shipping and $48 PayPal fee. Now the wait begans and the ordering of BMS and boxes. Thanks for all the...

Hi, I’m so happy I found this forum. I didn’t know how much I didn’t know. I plan on powering a small boat with a 35A / 24v fixed pod motor using 8, 280ah LifePO4s. The cells have to be in 2 seperate packs (4s 12v) Should I put a 4s BMS in each pack or use one 8s BMS which will require...