solar power to charge my battery for my cabin

i have a shed in the woods(PA.)that we stay in on the weekends and i week or two out of the yr.
see link of the camping shed..
http://community.webshots.com/user/adamant117

it is not in full sun.(few hrs. per day max)
i have 2 Trojan t-105's that are in series.
i charge them with a new sears 10/2 amp trickle charger.
soon we will be adding 12 volts lights.( 5 or six  of 12 volt few amps each).
i have a generator that i use to run the microwave, hot plate, coffee maker and a/c when needed.
i am looking for a solar panel kit that will charge  the battery's during the week when we are there and not there.(120 watt panel i feel should do it)
what do you recommend..?  it needs to be a expandable system...i am looking for a complete system...that i can install
anthony grelli