"How much does solar cost?" is one of the first questions people ask. The honest answer is: it depends. Here are the factors that affect the price of a rooftop solar system.
1. System size (kW)
Larger systems cost more in total, but the cost per kW often reduces as size increases, because fixed costs like design, approvals and labour are spread across more panels.
2. Panel type and brand
- DCR panels (required for residential subsidy) usually cost more than non-DCR panels
- Higher-efficiency technologies like TOPCon may cost a little more than older types
- Reputed brands with strong warranties may be priced higher
3. Inverter type
- On-grid inverters are the most affordable
- Hybrid inverters cost more and need batteries
- Microinverters cost more per kW but help on shaded roofs
4. Batteries
Batteries can add a large amount to the cost. Lithium batteries cost more upfront than lead-acid but last longer.
5. Mounting structure
- Standard low-height structures are the most economical
- Elevated structures need more steel and labour
- Sheet roof and tiled roof mounting have their own costs
6. Cable lengths and site conditions
Long distances between the roof and the meter, multi-storey buildings and difficult access increase cable and labour costs.
7. Safety and protection
Earthing pits, lightning arresters, surge protection devices and quality distribution boxes are essential. Cheaper quotes sometimes skip or downgrade these.
8. Approvals and net metering
Application fees, net meter cost and paperwork handling may or may not be included. Check carefully.
9. After-sales service
Free maintenance visits, cleaning plans and service guarantees add value — and sometimes cost.
Where you shouldn't cut costs
- Structure quality
- Earthing and lightning protection
- Cable quality and sizing
- Inverter reliability and service support
Saving a little on these can cost far more later through damage, low generation or safety issues.
Comparing quotes
Ask each installer for a detailed, itemised quotation. Compare the same capacity, components and services side by side.
The bottom line
Price depends on what goes into the system. Look for value over 25 years, not just the lowest number today.
Contact us for a detailed, itemised quotation for your home or business — free of cost.
