MrParadigm

Youda thank you for the help, I can continue working on this project now. P.s. I've read into your solar setup at home. Very nice build and a interesting read. :)

Thanks for the quick response Youda, As we could not figure out how to communicate directly over modbus (which is not really a option as you've explained in your post), we actually installed a shunt meter (https://tbs-electronics.com/product/expert-modular-battery-monitor-12v-24v-48v/) to measure our batteries (The batteries we use are lead carbon batteries). But thanks for heads up ok, thanks for confirming my suspicion. The thing is, why is it allowed for the SCC to keep draining the batteries when the inverter is below the cut-off voltage (when there is no AC grid present)? is disabling the MPPT switch the only option to prevent this? Would the inverter not behave like a Off-Grid setup when the AC grid input is not present in the Grid-Tie with backup mode? What does those two settings exactly do? We noticed if we enabled them, it would discharge the batteries when Grid and PV was available. We thought it might be better to leave the batteries topped-off and only discharge if there is not enough PV (or grid). Noted. I wanted to use RS232 anyway, but had trouble getting the protocol as our supplier didn't want to share it with us. So thank you for the document answers: ^00251496161809100219000000{▒ ^D017VERFW:00001.01VW ^D037000,010000,99,3,3,2300,2300,04,120U▒ ^D1100000,0000,0000,0000,0540,100,+00000,2386,2380,2386,5001,0000,0000,0000,2386,2382,2380,4998,,,,033,037,000,0A▒ 6^D10100000,00000,,+00022,+00022,+00021,+00065,0000,0000,0000,00000,0286,0261,0262,00809,008,1,0,0,1,1,1▒▒ Thanks so much, I can work with this. I am going to play with it more tomorrow as I don't have time left today. what do the responses mean exactly? batterX_Battery-carbon-EN.pdf

Hello everyone, Great forum I stumbled upon while researching a 3-phase 10kW hybrid inverter. I have some questions about our inverter and hope you guys can help me out. Type inverter: We have this inverter connected to 3 strings of 4 batteries in parallel (48V, 150Ah) and 330W * 8 solar panels. We currently have grid connected as well, but the system is designed to possibly go off-grid and maybe have a generator as AC input. We do not want to feed back in to the grid. If I understand correct these inverter are rebranded by companies. We setup the inverters with solarpower. We want to read out the battery capacity and if the capacity is too low, shutdown the AC output, load, or the system. We did a test by leaving the inverter on for a weekend (3 days) with the AC output on, but no load and only PV power and full batteries (no grid). The system was inside and so almost no sunlight (0,2A). We set the battery cut-off voltage at 42 Volts, but when we checked after the weekend on a monday, the batteries were discharged to around 22 Volts and the inverter was turning off and on because of the little PV power. The inverter was showing no battery voltage and giving warning code 15 meaning battery is unconnected or too low. Should the inverter not shutdown the AC output when capacity is too low or is there another settings that needs to be set? Unfortunaly the inverter did not record this data when we checked solarpower... I want to write a driver that can communicate with the inverter through modbus or serial direclty, but I am having some issues. We bought a modbus card for the intelligent slot and the company we bought it from provided us with the P17 modbus protocol. But when we do a modbus poll (function 3, read holding registers) on the given adresses they are all zero up until 8074 and more around 26000, but we don't know what the numbers represent. we set the modbus card to 19200bps and slave ID 1. Our preferred method would be serial communication (RS232), but I can't seem to connect to the inverter. I tried with a USB to RS232 converter and directly with a USB cable. I know the settings: baudrate: 2400 bps data length: 8 bits stop bit: 1 bit parity: none I also have the RS232 protocol document (https://s3-eu-west-1.amazonaws.com/osor62gd45llv5fcg47yijafsz6dcrjn/Infini_RS232_Protocol.pdf), but this kind of communication is new for me and I don't quite understand it. I tried throwing some command at it like "QPI", but without a proper connection I don't get any responses. Hopefully someone can steer me in the right direction, because I lost sight after all this research...