Calculating minimum ballast for roof mounted solar system
For the rooftop ballast mount solar structure, Here we share two most important points to get the minimum ballast weight.
1. Wind speed, snow load and solar angle
Above data are usually request to do the strength calcuation first.
For example, 150KM/H with 15 solar angle is around 123KG/M2, then the minimum ballast weight you need is around 85kg/m2.
2. Roof's load-carrying capability
What's the age of your building? Do your building have strong steel truss structures?
For this part, Pls consult with your local engineers to get your roof's load-carrying capability.
For example, If your roof could only bear 30kg/m2, then the calculated ballast weight seems unrealizable. Therefore, Some more additional method will be applied, Like adding the wind deflector, connecting all the mounting array. These could help make all the weight, "solar panel+mounting + ballast weight", under the roof capability.
1. Wind speed, snow load and solar angle
Above data are usually request to do the strength calcuation first.
For example, 150KM/H with 15 solar angle is around 123KG/M2, then the minimum ballast weight you need is around 85kg/m2.
2. Roof's load-carrying capability
What's the age of your building? Do your building have strong steel truss structures?
For this part, Pls consult with your local engineers to get your roof's load-carrying capability.
For example, If your roof could only bear 30kg/m2, then the calculated ballast weight seems unrealizable. Therefore, Some more additional method will be applied, Like adding the wind deflector, connecting all the mounting array. These could help make all the weight, "solar panel+mounting + ballast weight", under the roof capability.
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