Cannibalization debate — What would you do?

Let's say you have a solar panel business. You have a main money page targeting "solar panel" (/solar-panel) and supporting pages targeting: * "solar panel price" (/solar-panel/price) * "solar panel installation" (/solar-panel/installation) * "solar panel subventions" (/solar-panel/subventions) The supporting pages all rank top 3 for their main keyword : * "solar panel price" 1st * "solar panel installation" 2nd<