Now using this with my MorningStar SunSaver MPPT 15A solar controller. The data provided is very useful and appears to be accurate. Once you get familiar with the menu structure, there is a wealth of technical data available. The RJ-10's (6-pin) 30' cable length is more than adequate for most installations. I use a T-connector at the far cable-end so I can also link the data feed to my computer (one or the other - can not use both simultaneously).If looking at this meter in the dark of night the text is readable, but in most other area lighting situations, you may need to have a light source mounted nearby to read the data. I plan to add a shaded LED light above the screen in future.