Panels

Size

  • Panel size: 1mtr x 2 mtr = 3.3ft x 6.6ft.
  • per kw 60-70 sqft as (prashAnt 2020 BLR)

Capacity

  • Ratings: Standard Test Conditions (STC) which is @ 25°C cell temperature
  • Avg generation per KW per day in BLR (considering rain and cloud) 4kWh (as per prashant 2020).
  • Annual degradation (as of 2020 tech) - 0.0045x annually (to be compounded during calculation).
  • Solar cell negative temperature coefficient: .003739x/°C (to be compounded during calculation). The cell temperature may go to 70°C (=> .76x efficiency) and the ambient temperature will be 45°C in bengaLUru.
temperature VA response
temperature VA response

Variance during day.

  • Peak production time (BLR) is roughly 11AM to 2:30PM.
solar panel angle effects 2pm 295W inverters
solar panel angle effects 2pm 295W inverters
irradiation vs VI
irradiation vs VI

Other features

  • Maximum power point tracking MPPT - panels track the sun! 15% increase in winter and up to a 35% increase in summer. MPPT on the inverter side is separate.

Installation

  • 13 deg south slant (considering BLR latitude) to maximize winter production.

Mounting structure

  • Could be elevated or flat on the roof.
  • Prefer corrosion resistant material like aluminum or galvanized steel for exposed parts.
  • 56 + 43 = 42
  • 46 + 46 = 48

Choosing a brand

  • Field performance anecdotes
    • Poor performance
      • 2021 - Vikram Solar panel
      • 2021 - MV
    • Good performance
      • Waree. Good service as well.
      • Loom
    • Uncertain
      • Canadian Solar
      • Panasonic
  • When panel is not showing guaranteed perforamnce, maintenance from the company may be needed. If so, better to go for companies with good local presence.