Of course you cannot install east west facing solar panels on your roof if it does not already slant in those directions.
Solar panels on east and west facing roofs.
Therefore directions like southwest or southeast are fine.
In winter when the sun is at an angle less than the pitch of the roof the panels will receive no sunlight.
For homes with roofs that face to the south and that have an appropriate pitch for mounting solar panels installing an efficient home solar system is fairly straight forward because both the roof orientation and angle pitch are optimal for harvesting clean energy from the sun.
Panels mounted on a standard pitch roof facing east or west will produce approximately 15 less output than panels mounted on a south facing roof of a standard pitch.
Technically east facing panels can get as much sun as west facing ones as long as there are no other issues like morning fog or clouds or shade.
Solar panels should face south for any home in america to obtain maximum power generation.
With east or west facing panels the sun will be behind the roof for half the day.
If you went with a professional solar installer they probably had a good reason to install panels facing east rather than west.
If you look back to systems that were built a few years ago you would typically find them facing south says david wedepohl director of communications and markets at the german solar industry association bsw.
However solar panels can be orientated on any roof that faces south of either east or west.