I-V characteristics of bifacial and mono-facial modules in the test roof-top PV field in Jerusalem weremonitored simultaneously. Analysis of factors affecting the energy gains due to contribution of bifacial module backis based on time-of-day, daily and monthly energy generation data. Among these factors: diffuse to global radiationratio, season and time-of-day Sun position. Daily energy gain of an in-field bifacial vs. a mono-facial module atunderlying surface albedo ～0.50 varies in the range 5 - 38 %. An evaluated equivalent efficiency of 21 % is based onthe measured yearly gain for bifacial solar cells with a front efficiency 18 %. Optimization of the PV field designshould increase these values.
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