5 kW solar system in Kerala — full cost, output & subsidy
A 5 kW grid-tied rooftop solar system is Kerala's most-requested residential size — it zeroes out the typical ₹4,000/month KSEB bill of a 3-BHK villa with two ACs, fits a standard RCC roof, and qualifies for the maximum PM Surya Ghar subsidy.
- 600–700Monthly units
- ₹2.07LNet price
- 350 sq.ftRoof needed
- 3.5–5 yrsPayback
What's in our 5 kW package
9–10× 540–580 Wp Tier-1 mono-PERC / TOPCon panels, 5 kW string inverter (Growatt / Deye / Sungrow) — hybrid optional for battery readiness, hot-dip galvanised mounting, DC + AC cabling, AJB + DCDB with surge protection, earthing and lightning arrestor, KSEB net-meter commissioning, PM Surya Ghar subsidy filing, and 5-year free preventive maintenance visits.
Generation across Kerala districts
Kottayam, Idukki and Pathanamthitta: 620–680 units/month average. Kochi, Thrissur, Alappuzha coastal belt: 600–650. Trivandrum and southern Kerala: 650–700. Wayanad and Kannur high-altitude zones: 580–630 due to higher cloud cover.
Payback and 25-year savings
Out-of-pocket: ~₹2.30 lakh after subsidy. Monthly savings on a ₹4,000 bill: ₹3,700–4,000. Payback: 4 years. Cumulative 25-year savings (with 5% annual tariff increase): ₹13–15 lakh.
Frequently asked questions
+Will a 5 kW system zero out my KSEB bill?
For most 3-BHK homes with a ₹3,500–4,500/month bill and two ACs, yes — a 5 kW system generates 600–700 units/month and exports surplus, typically reducing the bill to just the fixed charge (~₹100/month).
+5 kW solar price in Kerala?
All-inclusive ₹2.85–3.30 lakh. After the PM Surya Ghar subsidy of ₹78,000, net cost is ₹2.07–2.52 lakh.
+Single phase or three phase needed?
5 kW is the upper limit of most single-phase KSEB connections (load up to 5–7 kW). Three-phase is preferred for cleaner export and future battery / EV charger expansion.
+Roof area for 5 kW?
Around 320–360 sq.ft. of shadow-free roof — 9 to 10 panels on south or south-east tilt.
+Does it work in monsoon?
Yes — generation drops 25–35% in June–August but is offset by surplus banked from drier months under KSEB's annual net-metering settlement.