Time has come to replace my good old Sunny boy inverter which has worked hard for almost 10 years. I have 9 panels facing east wired into one string, and 10 panels facing south wired into two strings (5 panels each string). These 3 DC inputs work fine with the current Sunny boy inverter because each MPPT has 2 DC inputs. I have searched for replacement inverter and haven’t found any product which accommodates 3 DC inputs. What is my options: 1) get a Solis or SolaX, ask an installer up onto the roof to rewire those 10 panels into one string, then have 2 DC inputs connected to Solis/SolaX; or 2) is there a way the 10 south facing panels can be combined into 1 DC input prior to inverter? Going up to the roof to rewire the panels is costly and installers are all very busy currently. My system is 3.5kw, there are 3 external DC isolators. Any suggestion and help is appreciated.
Grid-tied solar inverter dual MPPT, is there a product offer 3 DC inputs?
- Thread starter joreen
- Start date
Help Support Talk Electrician Forum:
funnily enough I mentioned SMA and the 3 inputs about an hour ago on another thread - spooky!
without knowing the panel spec I would think 10 panels on a single string should be fine, this can be achieved at the inverter by joining the strings there
BorisJ
Well-known member
Can I ask what has happened that it needs replacing?
earthing issue, SMAs are very fussy about earth connections. If you are on an earth rod (TT system) chuck a bucket of water on the rod and soak the ground around it. If you havn't got an earth rod, then fitting one connected to the inverter case can solve the issue - as customer of mine had this problem.
