Parallel vs series wired panel efficiencies in off grid application

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • krez
    Junior Member
    • Jun 2019
    • 8

    #1

    Parallel vs series wired panel efficiencies in off grid application

    Hi everyone I have a simple off grid setup 9x 325w (voc 47v, imp 9ish) panels. 24v 500ah battery bank and inverter. 2 victron mppt charge controllers handle different configurations of solar. I have recently experimented on a cloudy foggy day (no direct light) and have found interesting effects on my power production given the panels are wired series or parallel. In a 2s 3p configuration (with 6 of the panels) I produce roughly (for a given minute) around 26 watts per panel average. When using a parallel configuration with these same panels I produce 32 watts per panel average at these light levels, almost 25% greater at this low production. I also see this phenomena at higher powers but hard to track accurately and reflect that in this discussion given shading and fluctuating light intensity where I live. All runs from panels are only 2 or 3m of wiring to battery bank. Does anyone have any ideas why this would be occurring? Is this simply the power loss due to due voltage conversion down to bank voltage as opposed to in parallel configuration that is noticeable at low power? In addition is parallel wiring a better choice in my circumstance given these potential benefits and low wiring runs, especially where it goes against the traditional higher voltage lower loss common agreement in these setups. Your opinions and advice are highly appreciated. Regards Kristijan
Working...