The one breaker is just the disconnect between your bank and both inverters. So it’s usually between the batteries and bus bar. Then from the busbar it branches to both inverters. You wouldn’t ever need to isolate the battery power from one inverter since they are in split phase. But technically those breakers can actually provide 200 amps for 2 different terminals yes.
The 304Ah B grade cells from 18650 are a better deal. $135 per cell. Even if they don't test 304Ah which everyone has been reporting they are over 304Ah, it still puts out more than 280Ah. Same physical size.
I watched your video on the breakers but I can't really see how you mounted them. Are those DIN rail mounted?
Screwed them straight to the backer board with 4” screws. They came with odd little screws. I just did my own thing.
That works. I'm gonna order one. Appreciate the recommendation.
Too bad I haven’t gotten my affiliate links straight yet or you could have been my first referral. ? I think you’ll like it. Just gotta but s small box of 4” screws. Super heavy fire breaker though. Really nice.
I thought about that after I placed the order. Now I don't feel guilty since you don't have the affiliate links set up yet. Tell Ian he owes you a commission. ?
He would laugh. Ian’s a cool guy. He also has a biting sense of humor. ?
He certainly has the best customer service in the business. Which is also why he has such a following.
With the cutover to grid set at 51V is switched a few minutes ago at 26%, which is higher than I expected. It makes me wonder if battery #1 had an impact on that. At this point I want to let it charge the batteries back to where it switches back over so I can test that function then I think I'm going to add some more circuits and run it a few days to see how it does. I may try dropping the cutover down to something like 50.6v and see what that gets me, but at this point it's certainly functional.
Yeah just keep fiddling with it. You want to use most of the battery without the bms having to stop the discharge. So that may be 50v for you. Or even 49v.
I can’t remember anymore. Somewhere around 50%. It’s one of those things that after a while it just sorta runs itself. But the first couple months you’re tweaking and monitoring
I designed the same system I have for my father. I had to start his at 53v return to solar. 54v for him was around what yours is, Then after 4 months moved it up to 54V. I’m sure there’s a technical reason. To me it just seemed like break in and balancing of the rack batteries. Either way, it’s fun to tinker with every now and then anyway.
I responded in another thread with this. https://diysolarforum.com/threads/e...y-overkill-100a-bms-install.49902/post-702674
Rethinking this after looking at it again. If I put this between the battery and the busbar and only use one side of it I'm only going to have a single 200a breaker to protect both inverters. I'm back to putting this between the busbar and the two inverters to give me a 200a breaker for each inverter. That's what I was planning on initially so I'm still good with it. Am I missing something?
I believe that makes sense? I think I was leading you in the wrong direction there. Maybe mine has worked out so well because I have the two different battery banks. So in that case I would never exceed the amperage limit. Either way it should work great the way you describe. 200 amps off each pole. Good catch there. I tell my wife I’m always right. But that’s really not the case.
I have the wife thing all figured out and have for many years. She does what she wants to do and I do what she wants to do and we get along just fine. Plus she's always right.
