You only need solar panels once. They do not need fueling, refueling, lubricants, anything at all.

Solar panels have 25 year warranty. Can you think of anything that you have bought or can buy with a 25 year warranty?

At the end of 25 years, they will produce 92%. Perfectly acceptable for a few more decades. The latest panels produce 740 - 800W+/panel, this is sufficient for a lifetime without ever having to think of upgrades.