In PVsell, you can adjust the system performance by making use of the system loss inputs. These are located on the system tab. You have two options: Simple Losses, and Detailed Losses.
Note that inverter losses (inefficiency in conversion from DC to AC) are captured in the "Inverter efficiency at rated power" input.
You can also adjust system performance using the shading input.
Simple Losses
If you select 'Simple' Losses, you can enter a single loss factor that applies to the system (excluding the inverter and shading).
Detailed Losses
If you select 'Detailed' Losses, you can specify the individual loss factors that apply, and PVsell will calculate the total resulting loss. Note that this occurs through multiplication, not summation. The individual loss factors that apply are:
- Soiling: the reduction in yield due to dirt, grime, etc upon the solar panels
- Snow: the reduction in yield due to snow covering the panels
- Mismatch: the reduction in yield due to slightly different electrical characteristics that are inherent in any panel, which when combined produce less than 'the sum of their parts'. These losses are eliminated by micro-inverters and power optimisers
- Wiring: the total loss in DC and AC cabling
- Connections: the loss inherent cabling connectors
- Light Induced Degradation: LID loss
- Nameplate Rating: many panel manufacturers label panel ratings as (for example) 300 +/- 5W. On average these panels are often then less than 300W
- Age: accounts for the reduced performance of systems that have already been out in the field. Doesn't apply to new systems
- Availability: what percentage of the year will the solar production be nullified due to blackouts?
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