The newer Senecas are not prewired for solar. I contacted Jaco and the tech said 2013 and on are not prewired. I did add solar a couple on months ago, the installer went through the roof and fished the wires down behind the refrigerator. He did a really nice job. You would have thought it was a factory install.
I did 320 watts, two 160 watt panels and seems to work well. I may add one more 160 watt panel. My controller will support 500 watts. This will probably be over kill but is only money. Sam