Since you've admitted that you're not a handy person, have you considered the cost of having your modification repaired?

An easier solution would be to run the wires through a window.

Get a length of thick (at least 5x the diameter of your thickest cable) closed cell foam (a pool noodle could even work) and cut it to length to fit in the windowsill. Cut a 3-5 inch slit through the center of the foam, enough for you to push the connectors on the wires through. Place the foam in the windowsill, and close the window as tightly as possible. Cut a dowel or broom handle to length such that when wedged in the window frame, it compresses the window into the foam. Use "no residue tape" to seal up all edges of the window and foam for weatherproofing, both inside and outside.

Okay, so a few questions I need answered to give high quality advice.

What devices is the battery/solar generator intended to power, and how frequently will they be used?

What is the total combined wattage ratings of the devices, and how long do they have to be powered?

What is the brand of battery/solar generator, and what is its capacity?

Are you using the battery/solar generator for everyday use, or for emergency use? If for emergency use, what are the anticipated weather conditions for emergency use? If for emergency use, what is the expected duration of the emergency?

How many days a year are you anticipating the battery and solar panels will be used?

Where will the solar panels be located? Are they permanently fixed in place? How many hours of sunlight does the intended location receive? Have you done a sunlight survey to verify the location receives the maximum amount of sun available?