We are fairly sure other newcomers to the blog are also interested to plan a DIY ground mount solution. Hopefully A DIY enthusiast plan might offer some inspiration to begin planning.

The DIY enthusiast want to install 2 rows x 10 solar panels (500W) on an unused field near the main house.

The basic specs:

he goal to produce the structure from (penetrated) wood due to DIY & budget aspect. Will build it with his local carpenter friend. 

Fixed angle 45 degree.

the foundation: earth screws to be "hammered" into the ground or use the concrete pile.

Due to heavy snowfall in his area , he is planning to have the panels raised 1 meter from the ground.

Gap between the two rows 3.5 meters currently.

Are screw piles better than concrete piles?

the inherent design helical screw piles is a far more reliable than using traditional concrete foundations. ... Needless to say, after carefully considering the pros and cons of concrete vs screw piles.

The ground screw foundation is an ideal solution for ground mounted renewable energy technology as it provides the following benefits:

Suitable for all terrain including sloping hills and soil types

Significant cost savings through time taken to construct

No digging, no excavation, no waste, no concrete or wet trades

Complete construction and foundation solution

Fast and accurate insertion of ground screw

Statistically tested and certified by independent testing institutions for load, pull and wind load according to stringent guidelines

Easy to install – easy to plan

Sustainable ground engineering – no sealing or covering of surface or negative impact on landscape

Durable and long lasting

Easily removable and reusable.