willie_b

Hi Chris, Would you mind sending me the charger settings for the Epever MPPT that you have ? I remember that you also responded to one of my other questions on this forum about this setup. This is likely the route I will have to take seeing as I can't remove the Growatt as the "Master" device. Help very much appreciated.

Thanks for the response. The specific MPPT is probably more indicative. I'm open to use any reputable charger brands. I guess the question is mostly around the RS485 and CAN simultaneously being used. I've read different opinions, and wouldn't want so spend a fortune on expanding, and I'm still left managing everything manually.. or even worse, stuffing up my Pylontech batteries.

Good day, I'm looking to expand my charging capabilities by adding an additional MPPT charger with some panels into an existing solar system. I already have a well functioning setup consisting of a 1 X Growatt SPF5000TL Inverter 4500W Panels 2 X Pylontech 3000C batteries. I'm looking to add an additional 1 X Victron 75/15 Charger with own array of panels The question however is whether it would be possible to split the B/RS485 comms cable from the Pylontech master to go to both the Growatt AND the Victron. The rationale behind this is to ensure that the BMS still communicates to the chargers how much current can be charged with at that point in time. I don't want to just force charge the batteries with permanent 20A or something as I'm worried that I might mess them up. Or any other alternatives would be great keeping in mind the A/CAN port is still available on the Pylontech batteries. PS: I've added a basic diagram to illustrate the current setup, with future expansion plans.

Thanks for the advice - and as it turns out, the image of the power supply doesn't show the fuse, but when I opened it - it did have an inline fuse on the Positive line. This made me a little less worried as I wouldn't want to lose any magic smoke from any of my devices.. They are not only precious, but expensive as well

Theoretically that is an option, but I'm worried about installing any outlets that doesn't go via the main DB in the house... I've purchased the DC charger above, and found that my Keto breaker between the battery and the inverter has the PERFECT placement option for the power supply. I just installed it a few minutes ago - and works a charm...

I'm sincerely hoping that it automatically regulates the output voltage to suit the Pi, seeing as it can handle up to 60V - I'm confident it would be able to do that. One other thing - do we know for sure that those ring terminals would be able to securely connect to the Pylontech's + and - terminals.. I don't think a loose connection is ideal. Will have to wait and see when it gets here... Thanks for all the help on this topic..

Thanks - I've just ordered the one recommended above from Solar Assistant, hopefully it will be here soon so I can get going. Thanks for the assistance.

Thanks for the reply.. I did think about a DC to USB Power supply, but I would have to connect it directly to the Pylontech battery.. I'm going to have to be extremely careful not to stuff up my quite expensive battery..

Hi, I have a Growatt SPF5000 inverter with a Pylontech US3000 battery installed. I'm looking to introduce more stable monitor capabilities by using a Raspberry pi and Solar assistant. The problem I have is that, ironically, I don't have any outlets near where the installation is. Has anyone managed to find a suitable way to power a Raspberry pi from the dry contacts or something similar? Not sure whether that would work.. it would save me a LOT of effort. TIA

Thanks for joining the conversation Chris, So based on description of your system - the BMS cable from the Pylontech battery bank is connected to your Epever MPPT? The reason why I'm harping on about the BMS and the comms is primarily due to the fact that the BMS determines how much charge could be fed into the battery by virtue of the Comms cable into CAN or RS485 Port. So, once you charge the battery with anything that doesn't have the BMS comms linked - it will just go full tilt with 30A X 2 (Excluding Axpert) in your case, and charge the battery faster than what it's expecting based on the internal controlling measures.

Thanks for the response on this. At this point, I'm really looking for some sort of a wiring diagram of some sorts that would indicate what this could look like. For arguments sake, 1 X Growatt Inverter with own array of panels 1 X Victron 75/15 Charger with own array of panels Connected via a KETO breaker to 2 X Pylontech 3000C batteries. The BMS is linked from the Pylontech to the Growatt to regulate charging. The question then becomes, how will the victron know when to charge at 16A and when it can push a bit harder to charge... Without the direct BMS interface, the Victron won't know anything and keep pushing to hard. This would ultimately result in a BUS error on the BMS. Or do I have it completely wrong?

Hi @MihaiPet This is exactly the same question that I wanted to come find out on this forum.. I'm hoping that someone has some experience with this. There's basically 2 things that makes me a bit worried to do this. The BMS Comms from the battery can only go to 1 inverter as far as I know. And in my case the BMS control the Charge Amps via the interface How would you split the battery connection at the Keto Breaker to ensure that the voltage being charged from 1 inverter doesn't influence the reading on the second one. FYI: I have a Growatt SPF5000 that is completely maxed out from a panel perspective. In order to increase my ability to store energy, I need to be able to charge more before adding more batteries to my system. I have an existing Pylontech US3000. Not trying to hijack your post - hopefully someone can help.