Solar PV battery options

And what are they doing about it?

Collected another V4 today, quick look through the boxes, scanned all the cells etc all good, the 8-9 bus bar was on top of the accessories box so thats good.

I notice some of the boards look different to the one i bought in November namely this one, is yours same?

Seplos must have changed the design again, last one was this, which matched the one in the Seplos video I used to put it together, no instruction lets hope it goes together ok?

Didn't get chance to make a start on the build yet.

Found the answer, so question is can I connect this Seplos to the existing 280L and run them as one battery on on BMS?

Final update, of course its just the balancer part of the BMS that has changed so shouldn't be a problem connecting the two Seplos together.

Thanks, yeah I was on to Fogstar last couple of days, as its just the active balancer bit, nothing else changes just means another entity to add to Home Assistant.

For anyone building the Fogstar V4 with JK balancer there is no video specific to the build only the previous Seplos/Fogstar one, plus the link you posted, but I'm sure there is a wealth of info on the web plus there is a JK BMS thread on here, which maybe of help.

https://cdn.shopify.com/s/files/1/1347/0997/files/JK_Balancer_Upgrade_1.pdf?v=1750082480

Ok so have the new V4 Seplos. together with the JK active balancer, had to do a bit of a mod as it was too far forward and a bit close to the bus bar.

Couple of things on the balancer, I've set the start balance vol to 3.45 as per Seplos/Fogstar instructions, what should the Balance Trig be 30mV? Calibrating voltage didn't seem to be adjustable.

One thing I do note though is the balancer never switches off, or maybe I have the power wire in the wrong place, I'll ask Fogstar to confirm Monday, just thought it odd that it always on even with the battery switched off.

Just need to get a couple more cables and can then get it connected to the existing 280L, should I have the new V4 MB315 cells as master with capacity at 315Ah

Have you changed the default capacity from around 280/290Ah to the correct capacity? It should be set to 315Ah for example if that is the cell capacity you are using.