It is vital that the person who installs your solar power system is actually licensed to do so. An installer who is not licensed may install your solar panels incorrectly, or they may violate local regulations. In addition, a licensed installer can provide you with great information about these regulations that an unlicensed installer cannot.
Get your financial figures right before deciding on a solar system. You need to weigh the cost of the system against how much energy it will save you. Take the cost of the system and multiply it by its' lifespan. Now figure out how much energy you will use in that lifespan to determine if it is right for you.
The solar panel I used: http://amzn.to/2a7tN8n The controller unit I used: http://amzn.to/2a7tri9 Voltmetre (for testing): http://amzn.to/2a7u8I7 My homemade 12 …
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.