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I know it's been a few months since there's been activity on this thread, but for anyone still interested I actually got this exact scenario working with the current release (2023-08-16) version of Solar Assistant on my EG4 LL-S batteries. Initially, I saw the exact same behaviour that @crzykidd...

Very interesting! Looking at your register map (here) made me realize that while I did try bitmasking on the WORD and D_WORD boundaries, one thing I didn't try was handling the high/low BYTES of the register as individual value. In retrospect, I'm not sure why that didn't occur to me ;) I'm...

You definitely can't share them; only one master allowed per rs485 bus. My point was just that the manual and RTU documents both strongly imply there are two separate RS485 busses - the INV485 bus and the "Meter" bus. I still don't know where the Meter bus pins are though. Agreed the Wifi...

Sage advice. Physical inspection shouldn't be too much trouble -- it runs the length of the house through the basement above a drop ceiling to the breaker panel. I should be able to pop up enough tiles to see all of it. The previous owners used it on a separate 50a breaker for a hot tub, so it's...

Sorry, I suppose I should have updated this thread. No, unfortunately I'm still not able to poll SoH. I did check the high byte of the 16-bit return response from register 5, and it's always 0. There aren't any other references to SoH or Health in the modbus protocol doc, and all of the...

Amazing. Thanks so much for sharing, and sorry I didn't find that post in my searching. Clarifying question though: I'm assuming the black/white wires are the RS485 bus referred to in the documentation as "INV485", and the other two wires are GND/VCC to power the wifi dongle. Is that a safe...

Yup. I’m still using USB modbus in SA.

I've had this installed in my house for about 18 months now as a standby emergency power backup. So it's used, but barely; Still looks and works like new. I'm selling it because I've upgraded my system to 48V. I'm asking $700 CAD for it, and I'm located in southern Ontario just north of the GTA...

I've been referring to the EG4 Modbus protocol spec (provided by EG4 here) and successfully polling my inverter for the usual suspects (inverter state, battery voltage, PV power in, load power out, bus current, etc.) directly via a DIY modbus controller I'm working on. The one thing I haven't...

Makes sense. Thanks for the background. I suspected it wasn't a conductor-related issue. My inverter will support MPPT on up to 400V in, so my original plan was to use as high a PV voltage as I could in order to minimize line loss over the ~200ft run. Now I'm thinking maybe that's not...

@EG4_Jarrett did you ever get a chance to dig into this? I'd really like to be able to query the inverter directly using RS485, in addition to using the wifi dongle if possible. The only RS485 pins I've found that are referenced explicitly are pins 1/2 in the BMS port, but those don't seem to...

I'm planning an off grid ~4kW solar array, and am putting together a parts list. I plan on using the appropriate outdoor-rated 8awg cable in a conduit for the run between the array itself and where the cabling will enter the house. However, the array will be at the opposite side of the house...

Yeah. It would have been less confusing if they'd called "Return" something else, like "Back" :P

Nothing's changed as far as I know... are you sure you're holding the right button though? It's the "return" key, not the "enter" key. The second one from the right.

follow-up question... I noticed while I was doing my inspection that the printing along the length of the cable indicates it's rated for 300V. The panels I'm looking at have a Voc of ~40v, which means @ 8s I'd be running at 320v and that's without some margin for cold temperature. Is this maybe...