revanfreeman

Hello, Finaly the inverter it still haven't read 2 voltage too low for now (after totaly restart, shundown batterie) so, i tried to fix 0.5 too low voltage. I have buy usb serial cable and i have follow your link to do custom rj45 cable to make adapter. it's working and i have fix my inverter. But with some problem, indeed i needed to reverse TD and RD pin. Maybe i have bad anderstanding because serial cable supose to naturaly reverse pin ou just my inverter is different (5048mk pip solar) it's like this for me, to considerate serial d9 to out computer and not out serial cable +----------+--------+--------+------------+ | Function | RJ-45 | Serial | Function | | (display)| Pin # | D9 | (computer) | +==========+========+========+============+ | SGND | 1 ---- | 5 | SGND | | TD | 6 ---→ | 2 | RD | | RD | 5 <--- | 3 | TD | | +12V | 2 | N.C. | | | -12V | 3 | N.C. | | | | | | | | Inv Sw | 7,8 | N.C. | | +----------+--------+--------+------------+ Maybe help other people Thanks a lot for help Regard

Thanks a lot for your answer, it's very good lead to try to resolve it !! I think in my case, there is a problem with the hardware. This is the decreasing of 2 or 3 volts from time to time, not always, that is annoying. There are not load during test, and the other inverter is very stable. The decrease lasts until the total restart (shutdowns battery) or the complete charge battery. I will try to contact the seller, and depending on the answer, I will try to find the bug. Your explanation about calibration is useful. I think i will try to fix the difference with that method too Regards

Hello, I have 2 inverters expert king 5kw link in parallel and one find battery voltage more low the the other (same battery). Every time there are 0.5 different for example 47.8 instead of 48.3. But sometime there are 46.5v instead of 49v. In this case it's problem because inverter swith in bypass whereas battery at 75% power left. When i take voltage with multitools it's exactly the same that the highest. anyone have an idea what can do this .? Thans a lot for any idea . Regards