Variables and style rules

variable	description	key	comment
in_plane_skydiffuse
tz	timezone
dni	direct normal irradiation
dhi	diffuse horizontal irradiation
ghi	global horizontal irradiation
aoi	angle of incident
airmass	airmass
diffuse_ground or e_diffuse_ground	ground reflected irradiation
e_direct or e_beam	direct/beam irradiation in plane		What sounds better for native speakers?
e_diffuse	diffuse irradiation in plane
e or e_global	global irradiation in plane
sky_diffuse or e_sky_diffuse	diffuse irradiation in plane without ground reflected irradiation
surf_tilt	tilt angle of the surface
surf_az or surf_azimuth	azimuth angle of the surface
sun_zen or sun_zenith	zenith angle of the sun
sun_az or sun_azimuth	azimuth angle of the sun
temp_cell or temp_cell_kelvin	temperature of the cell in Kelvin		I think we don't need Kelvin, that is obvious
volt_mpp or voltage_mpp	module voltage at the maximum power point		likewise: ampere, power