Affiliate Disclosure

Some links inside the book (specifically, the backup-power hardware links in Part 3) are affiliate links: if you buy through them, we may earn a commission at no extra cost to you.

Two commitments about how we use them:

• The book's sizing method produces the recommendation — your load-audit number decides which class of product we point to, not the commission.
• We never mark a product as "recommended" that contradicts the method's output, and the disclosure appears again in the chapter where the links live.

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