A need exists for the rapid evaluation of photostability of a‐Si:H solar cells. An accelerated method was developed that accurately reproduces for a‐Si:H solar cells in a matter of minutes the extent of degradation (as characterized by I‐V parameters) produced by weeks of continuous soaking at one‐sun levels of irradiation. Such method is suggested as a way to rapidly predict long term one‐sun intrinsic photodegradation of a‐Si:H solar cells fabricated by a variety of techniques.