Step-by-step design trade-offs across the workflow — pick the better choice for each user goal and see why with real numbers.
Begins at Step 1 — Goals and system type. Continue through each workflow quiz in order, or pick a step below. Steps 3, 7, 9, and 11 have no quiz — those are read-only or procedural steps in the workflow.
The Step 1 quiz is an early taste of battery economics, not your final storage decision — run the full check on Step 8 — Battery storage.
Practice one design guide step at a time — questions filtered to that part of the workflow.
Step 1 · Goals and system type
Solar-only vs adding a battery — when hybrid pays off on 25-year savings, and when a larger solar-only array beats a smaller hybrid on annual bills.
3 questions
Start quiz →Step 2 · Site assessment
Shading trade-offs — does removing a tree pay off on payback and long-term savings?
2 questions
Start quiz →Step 4 · System size (kW)
Payback and 25-year net savings — how array size, tariffs, and upfront cost trade off when the array is too small, about right, or oversized.
6 questions
Start quiz →Step 5 · Choosing and placing panels
Orientation, tilt, flat-roof mounting, and load shape — generation, savings, and self-sufficiency trade-offs on the roof.
9 questions
Start quiz →Step 6 · Choosing an inverter
String vs microinverter — shade recovery and micro premium at 25 years, then mixed-orientation capacity at 25 years and payback.
4 questions
Start quiz →Step 8 · Battery storage
Solar-only vs adding a battery on the sized design, whether surplus solar can justify a larger pack, then small vs large kWh on savings and self-sufficiency.
4 questions
Start quiz →Step 10 · Design and proposal review
On the sized design — generation vs usage, winter self-sufficiency, payback, and 25-year savings as the client sees them on the proposal.
5 questions
Start quiz →Tariffs are illustrative only, in USD, not local currency.