First and foremost, thank you for the fast reply. I have the batteries in parallel (pos to pos and neg to neg) with the charger directly connected to the one of the batteries pos and neg. I use the victron smart shunt and it's showing both batteries charging up just fine --- slow but fine. I can't help but wonder why the company told me I need another charger since the batteries BMS is different. Strange.
I thought so (common sense rule) but wanted to ask anyway. Again, thank you for your assistance.
Not my best time of day for heavy thinking but batteries of different capacities in parallel should get UN-equal division of the the total amperage. Not that it is a problem. Think of it like filling two tanks one smaller in overall size than the other but connected together. You are filling at 3 gals per minute. You put 2 gallons in the large tank to be at the same level 1 gallon in the small tank gets you.
This will result in the batteries becoming unbalanced. The battery that you connect loads or charging to will get more current.
i should have paid a lot more attention in school LOL.
Stupid question. Wouldn't doing what you just described make the batteries be in "series" vs. "parallel" and change the voltage from 12v to 24v? I want to keep the voltage to 12v for now.
They are both 200Ah batteries so same capacities. One has a 100A current limit so charging the pair at 200Ah would be the limit as each would theoretically get 100A.
Yep but not in his case. He's filling two 200 gallon gas tanks. One has a 100amp nozzle size and the other has a 200amp nozzle size.
No, you connect the batteries in parallel: + to +, - to -.
Correct, I have two 200ah LFP batteries. The only difference between the two batteries is that one of the BMW is rated to 100a and the other is the "PLUS" version which has 200a BMS. Sorry if I didn't state that correctly in my original post.Yep but not in his case. He's filling two 200 gallon gas tanks. One has a 100amp nozzle size and the other has a 200amp nozzle size.
As long as he is pumping 100amps flow rate it will fill both 200 gallon tanks at the exact same time
I have 2, 200ah LFP batteries
Aaaah ok. Now I understand. Yep, I don't have it wired that way right now but can go change it. I currently have the charger wired directly to the 200ah battery with the 100a BMS. When the other arrived, I just put the batteries in parallel but left the charger only connected to the original +/- of the one battery.
I don't think there is any benefit to bus bars with just 2 batteries. Diagonal wiring (as described above) is ideal and identical for both batteries.
Ah, yeah I should not be doing any thinking . Missed that point entirely.Yep but not in his case. He's filling two 200 gallon gas tanks. One has a 100amp nozzle size and the other has a 200amp nozzle size.
As long as he is pumping 100amps flow rate it will fill both 200 gallon tanks at the exact same time
I have 2, 200ah LFP batteries
Completely true. I just plan ahead when building out battery stuff so once I go past one battery I use bus bars.
