Nearby agricultural activity

Nearby farming is a land-use factor caused by people that increases how much dirt settles on PV modules. Dust from fields settles on the module glass. It absorbs, reflects and scatters light, so less light reaches the cells and array current drops. The main failure mode it drives is granular dust soiling losses. Fields next to the array can make the loss uneven across the site. One report found soiling of about 0.36% per day in an area with heavy farming, compared with 0.01% per day in a desert with no farming, construction or industry. In dry climates, farmers often burn crop waste at the end of the season. Wind can carry the fire to the PV plant, and in Thailand this is the main cause of PV plant fires. To reduce exposure, schedule cleaning after plowing. Where the soil is not actively conserved, plan for frequent cleaning. Against fire, put fire protection measures in place and encourage the local community not to burn farm waste. Field failure surveys record an agricultural setting as a special stress condition for a PV site.

<!-- review notes

• sentence 2: support check: partial - Passages state dust causes absorbance, reflectance, dispersion, reduced photons and lower array current, but link to dust specifically from fields is only the general agricultural-activity mention.
• sentence 5: support check: partial - Passage supports burning agricultural waste at season end and wind-borne fire as main cause in Thailand, but says fires are main cause in most Thai plants and 'dry climate' farmers framing is loose. -->