What would solar cost you?
Built on the current CEB and LECO tariff blocks and the 2026 feed-in rates. Change anything below and every number updates instantly — no signup, no sales call.
Tell us about your place
Six answers. Everything else we estimate.
YOUR SUPPLIER
CONNECTION TYPE
PROPERTY
PREFERRED SCHEME
Zero Export keeps every unit for yourself with a battery; Net Plus sells every unit to the grid.
ROOF TYPE
Roof type changes the mounting cost, not the generation.
DAYTIME / NIGHT-TIME USAGE
About 140.8 kWh a month (4.7 kWh a night) is used after dark — 2 × 5 kWh battery (10 kWh) carries it.
SHADING
Your estimate
Updates liveESTIMATED MONTHLY SAVING
Rs 18,420
Your bill drops from Rs 18,500 to about Rs 80 a month, with a 10 kWh battery carrying the evening.
SYSTEM SIZE
3.1 kWp
5 × 620W panels + 2 × 5 kWh battery
INVERTER
5 kW hybrid
INDICATIVE COST
Rs 1,820,000
Supply + install, incl. tax
PAYBACK PERIOD
7 yrs
Then it's free power
ROOF AREA NEEDED
≈ 150 sq ft
You have room
ANNUAL GENERATION
3,839 kWh
Sri Lanka average sun hours
Rs 10.9 million saved over 25 years
Assumes 6% average annual tariff increase
Indicative only. Final figures confirmed after a free site inspection — roof condition, shading and phase load all affect the result.
MONTH BY MONTH
Your generation across the year
Solar output is not flat. February and March are your strongest months; the two monsoons pull May and October down. We size systems against the annual total, not a sunny day.
Units generated (kWh)
Darker bars mark your four strongest months.
- Annual total
- 3,841 kWh
- Best month
- Mar · 381 kWh
- Weakest month
- Oct · 270 kWh
- Daily average
- 11 kWh
MODELLED BOTH WAYS
Which setup pays you most?
Same roof, same bill — run as a Zero Export battery system and as Net Plus. Based on your inputs, Zero Export comes out ahead.
Zero Export
Best for youMONTHLY SAVING
Rs 18,420
- Monthly saving
- Rs 18,420
- Paid in cash
- No — nothing is exported
- 25-year total
- Rs 10.9M
- Battery
- 10 kWh
Pays back in 7 yrs
Net Plus
Sell everythingMONTHLY SAVING
Rs 7,393
- Monthly saving
- Rs 7,393
- Paid in cash
- Yes, all generation
- 25-year total
- Rs 855,847
- Note
- Rs 23.11 / unit
Pays back in 7 yrs 2 mo
HOW WE CALCULATE
Every assumption, in the open
Most solar calculators hide their maths because flattering assumptions produce flattering numbers. Ours are listed below. If you think any of them are wrong for your property, tell us on the site visit and we will rerun it.
This is an estimate, not a quote. It cannot see your roof. Shading, roof condition, phase balance and your actual consumption pattern all move the real number — sometimes by a lot. The free site inspection is what turns this into a fixed price.
- Tariff in force
- Approved Tariff, effective from 11 May 2026 — PUCSL Annex-2 — Tariff Table for a 30 Day Billing Cycle
- Sun hours
- 4.0 peak sun hours per day, island average
- System losses
- 14% for inverter, cable, dust and temperature
- Panel degradation
- 0.5% output loss per year
- Tariff inflation
- 6% average annual increase
- Net Plus feed-in rate
- Rs 23.11 / unit
- Panel rating
- 620W per panel, about 30 sq ft of roof each
- System life
- 25 years, with one inverter replacement at year 12
- Roof orientation
- Assumes south-facing with no obstruction
- Zero Export battery
- Sized to carry your night-time usage, drained to 80% at most — 5 or 16 kWh units, whichever covers it at the lowest price
Happy with the numbers?
Turn this estimate into a fixed written quote — free site inspection, no obligation.