We can repeat this for a similar panel on the shadowed side of the LM, near the door.

Using this tool we can find the view view factor from the LM panel to the shadow that the LM cast is approximately 0.15
[link to www.thermalradiation.net]

Regolith temperature 342 K 69C

[link to www.wolframalpha.com]

Giving us 760 W/m^2 radiated thermal energy from the lunar surface.

The Lambertian reflected light will be ( lunar highlands, albedo 0.16 ! )

[link to www.wolframalpha.com]

143 W/m^2

Finding the insolation input for the panel per m^2
[link to www.wolframalpha.com]

0 W/m^2

The energy into the panel will be insolation * solar absorptivity + lunar thermal emission * viewfactor * panel emissivity + reflection * viewfactor * solar absorptivity.

Using these figures for anodised aluminium.
[link to www.solarmirror.com]
a=0.14
e=0.84
and a view factor of ( 0.49 - 0.15 ) = 0.34

[link to www.wolframalpha.com]

262 K, -11 C

Assuming minimal ingress of heat from the panel and minimal conduction around skin of the vehicle.

K