Hi, I have installed Solar Assistant (SA) after watching Ryan's webinar and its working great. Now I am looking into getting the Batteries in there (4 ECO-LFP480002). That led me to wonder if I should do closed Loop (CL) or not (assuming CL would give me a view into all the batteries in SA) add another CAN to USB for the SA raspberry.
Those Eco's are PYLON so it might work..
Currently the comm's are not fully understood.
What I have read is if I can do closed loop, that will take care of all the battery settings for the Rosie, which sounds pretty good to me. And as a potential added bonus it might populate SA for me.
What are the Con's to using the Rosie in a Closed Loop?
-Bill
I have experimented with closed loop for Hawkes Bay in the past but before all the latest firmware updates may have fixed some issues. I also experimented using closed loop for an EG4 and Victron . I always went back to open loop charging so far because that gives me the exact control that I want and understand. Closed loop always made charging decisions that I did not fully understand . And that is with my JK Bms that I had configured the setpoints how I wanted them to be. The bms setpoints should be making some of the charging decisions.
I don't know anything about the Eco batteries you have or what the bms setpoints in those are.
My only advice is when you get the closed loop running is to watch what it does closely and see if that it is doing the lithium charging concept that you believe is best. There are lots of different view points of best lithium charging strategies out there . They may all be correct or some may be better for different systems , etc.
Regarding monitoring your batteries closely , if Solar Assistant doesn't do what you want, look into Home Assistant add on's to see if that will. I just took a quick look and seems like it is possible to get add on's that can get Ecoworthy battery cell information via bluetooth.
My JK Bms has support so I get some very nice detailed info shown in the photo here.
jkbms.jpg
Larry
Quote from: bigbillsd on March 29, 2026, 09:33:02 AMHi, I have installed Solar Assistant (SA) after watching Ryan's webinar and its working great. Now I am looking into getting the Batteries in there (4 ECO-LFP480002). That led me to wonder if I should do closed Loop (CL) or not (assuming CL would give me a view into all the batteries in SA) add another CAN to USB for the SA raspberry.
Those Eco's are PYLON so it might work..
Currently the comm's are not fully understood.
What I have read is if I can do closed loop, that will take care of all the battery settings for the Rosie, which sounds pretty good to me. And as a potential added bonus it might populate SA for me.
What are the Con's to using the Rosie in a Closed Loop?
-Bill
Depends on what your loads are. If below say 100W per 5kWh battery then the bms won't see that small current draw and soc will drift from reality. So if idling very lightly overnight you could be in for a nasty surprise when eventually system shuts down due to low voltage while soc happily says plenty of % left.
Which simply doesnt happen when using open loop and a shunt, because the shunt can detect much smaller currents.
Quote from: Brucey on March 29, 2026, 11:35:10 AMWhich simply doesnt happen when using open loop and a shunt, because the shunt can detect much smaller currents.
I will be using a repurposed BMV 712 shunt. That is also something I will need to get into SA..
I did try connecting my ECO's to the Rosie just now. The MGNP does now give me SOC so I am thinking it may be working.. sort-of Nothing in SA anymore for the battery.
I do not seem to have a way to terminate the bus now, I plugged in the SA RJ45 into the MGNP second port and I plugged in the batteries into the Second Port on the Rosie. Now I am wondering how I can terminate it as there are no more ports on the CAN bus. I was googling a hub but not seeing much except stuff dedicated for certain printers. I was thinking I needed termination on Both sides. But it looks like it may be working without termination. Not a lot of Canbus errors on the MGNP. At least they do not seem to be incrementing up. I am thinking I am only seeing the First ECO battery. Each battery has a CAN port. Maybe I need to daisy chain them. But not sure how yet. There are a lot of ports on the front of the batteries.
I connected the Rosie CAN port to CAN on the front of the battery and it seems to see one battery. Then I added 3 more Twisted Pair cables, from the RS485-1 to the battery below's CAN port, same for the next two hooking up all 4 batts. I am pretty sure I am still only seeing one battery in the MGNP2 and SA. I saw Ryan's example and he sees all 4 of his batts.
If you see the IN RS485 Out ports on the right, I am using that for the EcoWorthy Battery monitor screen. But they are not RJ45 connecting, look like the 4 or 6 wire RJ's