Radical pairs, polarons, and fullerene anion radicals photoinduced by photons with energy of 1.98 - 2.73 eV in bulk heterojunctions formed by regioregular poly(3-hexylthiophene) (P3HT) with (6,6)-phenyl-C₇₁-butyric acid ester (PC₇₁BM) methanofullerene have been studied by the direct light-induced EPR (LEPR) method at a wide temperature region. LEPR spectra of the P3HT/PC₇₁BM composite were deconvoluted and the main magnetic resonance parameters of these charge carriers have been determined. A part of photoinduced polarons are pinned by large-depth traps in the polymer matrix. It was shown that magnetic resonance, relaxation, and dynamics parameters of photoinduced charge carriers depend extremely on the energy of initiated photons. Relaxation and dynamics parameters of both the charge carriers were determined separately by the steady-state saturation method. Longitudinal diffusion of polarons was analyzed in terms of spin interaction with the lattice phonons of crystalline domains embedded into an amorphous polymer matrix. The interchain spin hopping is determined by the number and depth of the traps photoinitiated in the polymer matrix. Pseudorotation of methanofullerene molecules in a polymer matrix was shown to follow the activation Pike model. The replacement in the composite of PC₆₁BM acceptors by PC71BM ones accelerates electron relaxation, hinders the formation of spin traps and favours more ordered (crystalline) structure of BHJ that facilitates charge transfer in the P3HT/PC₇₁BM composite.