Equipment, with model numbers
The quote should name the inverter, battery and panel models, not just sizes. With model numbers you can check datasheets, warranties and your municipality’s approved list.
What is on backup
Ask which circuits will run during a power cut. A cheaper quote may back up fewer circuits, which is fine if that is what you want, but you should know.
Protection and balance of system
Look for DC and AC isolators, surge protection on both sides, correctly rated breakers, earthing, mounting type and cable specs. These are where corners get cut.
Paperwork
The quote should include the Certificate of Compliance, and SSEG registration support if your municipality requires it.
Warranties
Equipment warranties come from manufacturers. Workmanship warranty comes from the installer. Ask how long it is and what it covers.
Payment terms
A deposit to order equipment is normal. Paying the full amount before installation is not.
