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BOS: meaning in solar

BOS means balance of system: everything in a solar installation other than the modules, such as the inverter, mounting structure, cables, protection devices, earthing and installation work. A quotation often prices the modules and the balance of system apart so the customer can see where the money goes.

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In more detail

BOS is an engineering shorthand and its edges are not fixed: some suppliers count the inverter inside it and some price it alone. Whatever you choose, use the same split on every quotation so customers can compare.

It is a cost grouping, not a document. The itemised list of what is supplied is the bill of materials.

Where it shows up in the app

A quotation prices a system line and a bill-of-materials line separately, each with its own discount and GST rate, and an optional battery line.

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Common mistakes

  • Changing the split from quotation to quotation

    The edges of BOS are not fixed and some suppliers count the inverter inside it, so use the same split on every quotation.

  • Treating BOS as a document

    It is a cost grouping, not a document. The itemised list of what is supplied is the bill of materials.

What to check before you send

  • You use the same BOS split as on your other quotations
  • The system line and the bill-of-materials line are priced separately
  • Each line has its own discount and GST rate set

Cite this page

Bharat Solar Venture. "BOS: meaning in solar." Bharat Solar Venture, last updated 11 Oct 2026. https://bharatsolarventure.in/glossary/bos

Canonical URL: https://bharatsolarventure.in/glossary/bos

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