The sophomore center dominated inside to record his first double-double and help Pacific avenge a 75-70 loss at Hawaii on Nov. 25.
Lorenzo McCloud added nine points and seven assists for Pacific (4-3), which recorded its second win in four days over a Western Athletic Conference opponent.
Joston Thomas led Hawaii (2-4) with 11 points and nine rebounds. Vander Joaquim added 10 points and six rebounds.
Pacific never trailed after taking the lead with a 9-0 run late in the first half.
Hawaii cut a nine-point Pacific advantage to 48-46 with 8:44 remaining, but the Tigers responded with a 10-0 spurt to take their biggest lead of the game.
Kelley highlighted the run with a three-point play followed by a basket inside. Kelley made all seven of his shots from the field and also blocked two shots.