ArrayBudget — Panels, batteries and inverters sized to the load you actually have.

1
Solar Cost per Watt — the Only Unit That Makes Two Quotes Comparable
Two quotes for "a solar system" are not comparable. Two quotes at dollars per watt are, and the conversion takes one division.
3 min read
2
Home Solar Battery Cost — Priced per Usable Kilowatt-Hour
Storage is the worst-value component of a solar system on pure energy arithmetic, and often the right purchase anyway. Which of those is true depends on why you are buying it.
4 min read
3
Solar Payback Period — the Four Inputs, and the One That Decides It
Payback is one division with four inputs. Three of them are knowable to within a few percent. The fourth — what your utility pays for exports — swings the answer by more than a decade.
3 min read
4
Backup Generator vs Solar Battery — Cost per Hour of Outage Covered
A battery is cheaper to own and runs out. A generator is cheaper to run and never does. Which one wins is decided by how long your outages actually last.
3 min read

Battery bank size