A system is more than the three headline components
Solar packages are often advertised as panels + inverter + battery. A durable installation also depends on mounting, DC and AC protection, correctly sized conductors, isolators, earthing/grounding, distribution changes, monitoring, labeling, commissioning and documentation.
What a quote should identify
| Area | What should be explicit |
|---|---|
| PV array | Module model, quantity, total DC rating, layout and expected production assumptions |
| Inverter | Exact model, AC rating, MPPT/string design and backup configuration |
| Battery | Exact model, usable capacity, power limits, quantity and communication method |
| Balance of system | Mounting, cables, breakers/fuses, isolators, surge protection, earthing and enclosures |
| Work scope | Electrical changes, civil/roof work, testing, commissioning, permits and cleanup |
| Support | Workmanship warranty, manufacturer warranties, monitoring handover and service process |
Package size does not equal performance
A “5 kW system” may refer to inverter AC power, PV array DC power or a marketing package size. Ask the seller to identify each rating separately. Storage should likewise be described in kWh and power in kW.
Start with your own numbers
Use the system-size calculator for an initial estimate, then turn the result into a consistent project brief before requesting quotes.