diff --git a/src/thermophysicalModels/radiation/Make/files b/src/thermophysicalModels/radiation/Make/files
index acd357afac..08c27f94bd 100644
--- a/src/thermophysicalModels/radiation/Make/files
+++ b/src/thermophysicalModels/radiation/Make/files
@@ -12,6 +12,7 @@ radiationModels/opaqueSolid/opaqueSolid.C
 radiationModels/solarLoad/solarLoad.C
 radiationModels/solarLoad/faceShading/faceShading.C
 radiationModels/solarLoad/faceReflecting/faceReflecting.C
+radiationModels/solarLoad/solarLoadBase.C
 
 /* Scatter model */
 submodels/scatterModel/scatterModel/scatterModel.C
diff --git a/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.C b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.C
index 017ea2a192..90dc9490d0 100644
--- a/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.C
+++ b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.C
@@ -760,6 +760,7 @@ void Foam::radiation::solarLoad::calculateQdiff
 Foam::radiation::solarLoad::solarLoad(const volScalarField& T)
 :
     radiationModel(typeName, T),
+    solarLoadBase(mesh_),
     solarCalc_(coeffs_, mesh_),
     dict_(coeffs_),
     qr_
@@ -814,6 +815,7 @@ Foam::radiation::solarLoad::solarLoad
 )
 :
     radiationModel(typeName, dict, T),
+    solarLoadBase(mesh_),
     solarCalc_(dict, mesh_),
     dict_(dict),
     qr_
@@ -985,4 +987,18 @@ Foam::radiation::solarLoad::Ru() const
 }
 
 
+const Foam::solarCalculator&
+Foam::radiation::solarLoad::solarCalculatorRef() const
+{
+    return solarCalc_;
+}
+
+
+const Foam::faceShading&
+Foam::radiation::solarLoad::faceShadingRef() const
+{
+    return hitFaces_();
+}
+
+
 // ************************************************************************* //
diff --git a/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.H b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.H
index f657fac0bd..5777e9dc2a 100644
--- a/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.H
+++ b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoad.H
@@ -99,6 +99,7 @@ SourceFiles
 #define radiation_solarLoad_H
 
 #include "radiationModel.H"
+#include "solarLoadBase.H"
 #include "volFields.H"
 #include "faceShading.H"
 #include "faceReflecting.H"
@@ -118,7 +119,8 @@ namespace radiation
 
 class solarLoad
 :
-    public radiationModel
+    public radiationModel,
+    public solarLoadBase
 {
     // Private Data
 
@@ -262,6 +264,12 @@ public:
             {
                 return qprimaryRad_[bandI];
             }
+
+            //- Return const reference to the solar calculator
+            virtual const solarCalculator& solarCalculatorRef() const;
+
+            //- Return const reference to the face shading calculator
+            virtual const faceShading& faceShadingRef() const;
 };
 
 
diff --git a/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoadBase.C b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoadBase.C
new file mode 100644
index 0000000000..617e2778fb
--- /dev/null
+++ b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoadBase.C
@@ -0,0 +1,60 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2022 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "solarLoadBase.H"
+
+// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace radiation
+{
+    defineTypeNameAndDebug(solarLoadBase, 0);
+}
+}
+
+
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
+
+Foam::radiation::solarLoadBase::solarLoadBase
+(
+    const fvMesh& mesh
+)
+:
+    regIOobject
+    (
+        IOobject
+        (
+            solarLoadBase::typeName,
+            mesh.polyMesh::instance(),
+            mesh
+        )
+    )
+{}
+
+
+// ************************************************************************* //
diff --git a/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoadBase.H b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoadBase.H
new file mode 100644
index 0000000000..5398c5a8b7
--- /dev/null
+++ b/src/thermophysicalModels/radiation/radiationModels/solarLoad/solarLoadBase.H
@@ -0,0 +1,105 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2022 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Class
+    Foam::radiation::solarLoadBase
+
+Group
+    grpRadiationModels
+
+Description
+    Base class for solarLoad models.
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef radiation_solarLoadBase_H
+#define radiation_solarLoadBase_H
+
+#include "regIOobject.H"
+#include "fvMesh.H"
+#include "solarCalculator.H"
+#include "faceShading.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace radiation
+{
+
+/*---------------------------------------------------------------------------*\
+                        Class solarLoadBase Declaration
+\*---------------------------------------------------------------------------*/
+
+class solarLoadBase
+:
+    public regIOobject
+{
+public:
+
+    //- Runtime type information
+    TypeName("solarLoadBase");
+
+
+    // Constructors
+
+        //- Construct
+        solarLoadBase(const fvMesh& mesh);
+
+
+    //- Destructor
+    virtual ~solarLoadBase() = default;
+
+
+    // Member Functions
+
+    // Access
+
+        //- Return const reference to the solar calculator
+        virtual const solarCalculator& solarCalculatorRef() const = 0;
+
+        //- Return const reference to the face shading calculator
+        virtual const faceShading& faceShadingRef() const = 0;
+
+
+    // IO
+
+        bool writeData(Foam::Ostream&) const
+        {
+            return true;
+        }
+};
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace radiation
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //