Do not buy applegreen products. They do not respond to request for support. I requested a copy of the software to communicate with the inverter & after 5 times of asking they have not supplied the software. I asked for spec on the communication Port to communicate with the battery and one said they can't communicate. I posted on their FB page & another said it's modbus protocols but has no more information but I still didn't get the software. I think they just relabel another unit & sell it because they know nothing about it & can't understand why you would want to monitor the batteries.