DELTA 2

71 yr old woman, off grid, living in 5th wheel trailer. I have a Delta 2 with extra battery and 2- 220 watt bifacial panels. I live in No. California and it can get very hot. I'm planning to bring my powerbanks inside. Since I do not plan to use the propane heater, I removed a heating vent for the purpose of plugging in my power cord to an outside generator. I'm concerned the power cord may not be long enough. Can I use a good extension cord to plug in my peerbank to the generator?