thoc

In case anyone reads this in the future, I've managed to solve the issue by upgrading my Growatt firmware to 40.06, 41.06 and that resolved the issue.

Hey guys, long time! I've recently bought a new Dyness BX51100 5.12kWh battery to go along with my system (Growatt SPF 5000 ES, 2x Dyness B4850 2.4kWh batteries). With the new battery as the host I've been able to get things working using LI Protocol 51 & Dip Switch on 0100. Everything seems to work fine but randomly after like 5hrs or so I get error 20 (BMS Comms issue) on the inverter and we lose power. After a couple of minutes the inverter reconnects to the BMS and we're fine again for a couple of hours. Sometimes it does this 2-5 times after each other before it connects fine again and runs. I've not been able to figure out why it happens but its probably not random, what I've seen last night for example is when the inverter was suppose to switch back from battery to grid it happened again. Any ideas would help? I know @Buyeye mentions protocol 52 but that doesnt work my end it then errors with 04 and 20. Now my firmware is still 040.03/041.03 so I've grabbed the latest & will upgrade it sometime tonight/tomorrow but am not sure if that'll resolve it? Those drops shows where & how often it happens.

Ok cool, my Dyness B4850 only has one CAN/485 available to go from the battery to the inverter & no RS232 ports. So rate I'd only be able to connect to the inverter & not the batteries then.

@zsde Sorry one more question, if your SA is connected to both inverter and Battery, is your battery then not connected directly to the inverter with the CAN/485 cable? Because my Dyness battery only has one port currently going to inverter.

@zsde Do you use solar Assistant through the USB port? So the inverter itself is still in charge of management and solar assistant then just reports? As I understand solar assistant could be plugged in directly to the batteries instead of the inverter but then it takes over the management from the inverter?

Ok cool at least yours is also wonky so its something their end and not mine SolarAssistant is the raspberryPi thing right?

Hey guys, has anyone noticed the strange values in the growatt server dashboard? They dont seem to add up all that well to me and I'm wondering if its the dashboard itself that's wrong or something on my end. Basically below you'll see that I've generated 10.0kWh from Solar, imported 4.6kWh from the grid, Discharged 0.1kWh from Batteries and Charged 10.0kWh, with a total consumption of 9.6kWh today. But I think its reporting wrongly between the Solar today & Charge today. Since I've been running SBU today with SOL-only charge, there's no grid going into my batteries & I'm able to run all day just on Solar while charging as well with the occasional battery discharge. If my Consumption today is 9.6kWh & Grid import is 4.6kWh, it should mean that 5kWh went from my panels into my house consumption, meaning another 5kWh into battery? This is the info from the growatt dashboard, saying they're calculating the charge using the entire Solar produced today and adding any grid charge to it, but surely that calculation is wrong then as it doesnt take solar consumed into consideration? Btw I picked this up while building my Home Assistant dashboard a couple of months ago and revisited it today when I did some slight upgrades, think my HA dashboard is more accurate at this point:

Im really contemplating trying CAN and protocol 52 then since I'm so lazy and not keen on disconnecting the batteries and driving to Rectron 😆

Weird that its suddenly working without alarms if they didnt do anything? Is your dips also 0110 and Protocol 01?

Ok I'll give that a go before I make time to take the batteries to Rectron. Just to clarify, what would that translate to in Volts? My current User Defined settings has these on: Bulk Charge Voltage is 53.5V Floating is 52V Low DC cut-off is 46V Would you say these sound reasonable? Voltage back to Utility 47V instead of default 46V And just to make sure I understand this correctly, once the battery drops to this amount it'll switch back to AC, so the lower this amount the longer i'll be on batteries. Voltage back to battery 52V instead of default 54V When the battery reaches this amount again the inverter will switch to batteries instead of AC I think at the end of the day I need to get to Rectron in order to use the full potential of the batteries else i've wasted money 😆

Anyway I wanted to test it a bit more, using the batteries at night, and checking if it does drop the panel production completely just after my batteries are recharged the morning. It felt like that was the case a day or two in the mornings. But then this also occurs in the afternoons when my batteries are fully charged. 🤔

It definitely felt like that a day or two, but i've not been able to completely confirm. I figured it might just be the inverter that still needs more work on the firmware side of things (Doublechecked, Im on 040.03/041.03 btw) because even when I had my charge source to SOL only, at night when my batteries "die" around 10:30pm it ended up charging from Utility for about an hour before I noticed, I had to reset SOL charge source again for it to stop... And the morning after it looked like it used the panels to charge the batteries (fine) and also the Utility to power my house load, it was on SBU or SOL. I was hoping that it would charge and supply from panels...IE charge the batteries with the excess panel production that I'm not consuming? I might be misunderstanding some of the principles, but my idea would be to try and avoid Utility as much as possible even if it means the batteries might take longer to charge during the day, and even discharge a little to assist in the load spikes..

Ok great thanks! I was holding off on taking the batteries in since they're connected and somewhat working, this just motivates me to do it now.

@tetrasection yeah the firmware did help, this used to happen while I would be in SUB as well, after the firmware upgrade that went away so I just assumed I might need another upgrade later when there's a new version. It doesnt really look like my voltage is doing anything if I understand the historic data from that day correctly, 11:55 to 12:00 in the attached spreadsheet is when one of the drops happen, this spreadsheet is from the growatt server, not sure if you or @Buyeye spot something out of that? It happens normally quite quickly after I make the change so i'll perhaps just monitor it directly on the inverter to be sure. I barely follow what all these values mean 😆 had to quickly google what voltage sag is😛 About the Battery SOC stats, its quite inconsistent on the graphs as well, hopping around a lot, this is just quickly from today where I've only been on SUB: Results.xlsx

These gaps for example is where I tried running on SOL or SBU today: