Modules that are older or have lower voltage or current ratings can sometimes be connected to a single optimizer input as long as they do not exceed the ratings of the optimizer. For example, two low voltage modules can be connected in series, or two low current modules in parallel.
Things to remember:
- Voltage sums in series.
- Current sums in parallel.
- Monitoring is per input, so modules connected in series or parallel before the input will show a combined total.
- Do not exceed optimizer ratings.
- Always test before connecting.