Typical capital costs for small systems
Upfront costs vary significantly by technology, capacity, location, and local labor costs. Rough indicative ranges for small systems (household to small community) are:
- Simple solar still (DIY or low-tech manufactured): $50–$1,500 depending on materials, size, and build quality.
- Small PV-RO unit (50–500 liters/day): $2,000–$20,000 including PV array, pumps, membrane modules, and basic pre-treatment.
- Small solar-thermal or HDH units: $3,000–$30,000 depending on collector area and thermal storage.
Cost drivers:
- PV and battery capacity: Batteries substantially increase upfront cost but improve reliability.
- Pre-treatment and post-treatment equipment: Necessary for water quality and longevity.
- Quality of components and local installation labor: Higher-quality membranes, pumps, and corrosion-resistant materials cost more but reduce lifecycle costs.
- Shipping, import duties, and site preparation: Remote locations can see higher total installed costs due to logistics.
Financing and economies of scale:
- Costs per liter typically fall with larger systems; community-sized installations are more cost-effective per unit water than single-house solutions.
- Grants, subsidies, and concessional financing reduce upfront barriers.
A detailed site assessment and budget that includes maintenance, spare parts, and brine handling is essential to estimate realistic lifecycle costs rather than relying on headline capital figures alone.