Make sure to have your solar panels professionally installed. The installation of these panels needs to be very precise, and you do not want to mess it up. Having a professional installation also provides you with a warranty, and this gives you somewhere to turn if things are not working right.
Carefully consider the types of solar panels you plan on having installed. Long ago, if you didn't have enough roof space, you'd need very expensive high efficiency mono-crystalline panels. There are now more advanced polycrystalline panels and even thin film panels. If you've got enough roof space, you might wish to look at the size of the panels in relation to their output capacity to avoid having insufficient panels that you need more of later.
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If you think you might need to replace your roof in the near future, hold off on installing solar panels. Solar panels can be difficult for some roof installers to contend with, and this means a more difficult and increasingly costly roof repair bill. If you can afford to wait on the panels and replace your roof first, this is the way to go.