Victron MPPT to Solos AC coupled inverter?

[KantPredict]

So I currently have a completely off-grid 1kw 12v inverter running from 4 Valence U27-12XP batteries in parallel. They are charged with a Victron SmartSolar 150/35 MPPT controller. My thought is that I can buy an AC-Coupled inverter like the solis rai-3k-48es-5g and have it push power into my mains with export limiting, while the battery is still charged from the solar. Will this work or will it freak out the Solis inverter?

 

[SeaGal]

No. The Solis inverter is 48V, not 12V.

 

[KantPredict]

No. The Solis inverter is 48V, not 12V.

Okay sorry, forgot to specify that I plan to reconfigure the 4 parallel to series and add an external BMS to facilitate the change.

 

[SeaGal]

OK. What panels do you have? My initial thought would be that it's simpler and more efficient to deploy a Solis S5-EH1P hybrid instead and ditch the Victron?

 

[KantPredict]

I have 4x 440w panels. Thing is, I already own the Victron and it works fine with the panels in 2s2p (I have them in parallel on two different orientations for maximum daylight) so am only getting about 78v peak. The Victron is good for a maximum of 2000w at 48v but I'm only likely to get about 1kw peak per orientation throughout the day in the coldest weather.
Also, I found the AC-Coupled inverter for about £230 collected.
So for only another £230 I can add up to 3kw mains to my setup (less if I sell my old inverter to recoup cost).
Otherwise I'd have to reposition and rewire all my panels into series to get the minimum output voltage which I might barely hit in peak sunlight (30v x4 for 120v minimum string voltage). Or spend more money on more panels.
So would simply charging the battery with the Victron before the AC coupled inverter work?

 

[SeaGal]

OK - that all makes sense. Off the top of my head I can't think of a reason that wouldn't work ASSUMING that the Victron's charge port supports the necessary charging voltage for a 16S configuration (so about 55/56V) AND that its DC is galvanically isolated from ground (which I'd guess it is).

Ideally, the Solis should have CANBus BMS data so it knows about battery's SOC and charge/discharge rates, though running it using the LA profile is an option (assuming the RAI supports LA - the RHI / EH1P hybrids do).

Edited to add, 120V max would not be enough for the Solis hybrid, so I agree direct PV to Solis wouldn't be an option with your existing panels

 

[SeaGal]

P.S. if you do need to implement JBD to Solis comms, see my posting here that links to the two projects I combined to do exactly that.

Post in thread 'Daly2Sofar ESP32 based BMS to Inverter bridge, with added MQTT'

Dec 9, 2023

Hi

Has anyone got anywhere implementing an esp32 BMS to Solis inverter CAN interface.?? Ideally in Arduino. I'm aware of a semi commercial offering out there on github etc with binaries however ive been looking around for some source code examples as i want to be able to hack it around and put it on something like the Lilygo T-display S3 ot their 485 to CAN module. Ultimately i want to go JK bms to a Solis EH1 (Plyontech or SMA). Anyone know of any code for achieving that? Cheers Steve

Sure...

I have done JBD to Solis...

Better to use vanilla SMA protocol and...

• SeaGal