1) Inclination design

In order to make the solar cell module receive as much solar radiation energy as possible in one year, we need to choose an optimal inclination angle for the solar cell module.

The discussion on the optimal inclination angle of solar cell modules, which is used in different regions, is determined according to different regions.

2) Wind-resistant design

In the solar street light system, a structural issue that needs to be paid great attention is the wind resistance design. The wind resistance design is mainly divided into two parts, one is the wind resistance design of the battery module bracket, and the other is the wind resistance design of the light pole. The following two sections are analyzed separately.

(1) Wind-resistant design of solar cell module bracket

According to the technical parameters of the battery module manufacturer, the windward pressure that the solar cell module can withstand is 2700Pa. If the wind resistance coefficient is selected as 27m/s (equivalent to a tenth-level typhoon), according to the inviscid fluid mechanics, the wind pressure of the battery module is only 365Pa. Therefore, the component itself can fully withstand the wind speed of 27m/s without damage. Therefore, the key consideration in the design is the connection between the battery module bracket and the light pole.

In the design of this street light system, the connection between the battery component bracket and the light pole is designed to be fixedly connected with a bolt rod.

(2) Wind-resistant design of street lamp poles

The parameters of the street light are as follows:

Panel inclination A = 16o Light pole height = 5m

The design selects the width of the welding seam at the bottom of the light pole δ = 4mm and the outer diameter of the bottom of the light pole = 168mm

The side where the weld is located is the damaged side of the light pole. The distance from the calculation point P of the resistance moment W of the failure surface of the lamp pole to the action line of the panel acting load F on the lamp pole is:

PQ = [5000+(168+6)/tan16o] × Sin16o = 1545mm=1.545m. Therefore, the acting moment of the wind load on the failure surface of the lamp pole is M = F×1.545.

According to the design maximum allowable wind speed of 27m/s, the basic load of the 2×30W double lamp head solar street light panel is 730N. Considering a safety factor of 1.3, F = 1.3 × 730 = 949N.

So, M = F×1.545 = 949×1.545 = 1466N.m.

According to the mathematical derivation, the resistance moment of the annular failure surface W = π×(3r2δ+3rδ2+δ3).

In the above formula, r is the inner diameter of the ring, and δ is the width of the ring.

Breaking surface resistance moment W = π×(3r2δ+3rδ2+δ3)

=π×(3×842×4+3×84×42+43)=88768mm3

=88.768×10－6 m3

Stress due to moment of wind load on failure surface = M/W

= 1466/(88.768×10-6) =16.5×106pa =16.5 Mpa<<215Mpa

Among them, 215 Mpa is the bending strength of Q235 steel.