July 20, 20224 yr We have the following off-grid setup for our small Airbnb in a remote location: 4x JA Solar 365W Panels 1x Kodak OG-Plus 5.48 Inverter 2x Pylontech UP5000 Batteries The current panels are on a north-facing roof. We are wanting to install more panels of the same kind (so that we have 10-12 in total). The problem is that we only have space for 1 more panel on the North-facing roof. The inverter only has one MPPT input. We have the following options: Option 1: Keep 4 existing on north face in series. Add 8 new on East face in series. Parallel these two strings together at MPPT directly. Option 2: Keep 4 existing on north face in series. Add 4 new on East face in series. Another set of 4 new in series on East face. Parallel these three strings together at MPPT. DC Combiner box required? Option 3: Add 1 panel on north face to make 5 panels in series. Add 5 on East face in series. Parallel these two strings together at MPPT directly. Which of these would recommend? Or would you recommend something different? Would we need blocking diode on each string before the inverter for shading due to different roof orientations?
July 20, 20224 yr Another option is to simply add another mppt controller. Then you can align the panels more optimally.
July 20, 20224 yr Author Thoughts on the requirements of blocking diodes for different panel orientations?
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