Solar System for 1 BHK, What You Actually Need

Qbits warranty and service terms: Qbits public datasheets describe an expandable warranty but do not define a universal duration, remedy, registration deadline, service SLA, or exclusions. Obtain the current written terms for the exact model and sale before relying on a headline claim.

ALMM and inverter compliance: MNRE’s current ALMM page publishes solar PV module and cell lists, not an inverter list. Verify the inverter’s exact model documents and applicable scheme or DISCOM requirements separately.

Your 1 BHK electricity bill has crossed ₹1,500 per month and you have been thinking about solar. But every solar company wants to sell you a 3kW system, and the quotes feel oversized for a home with one bedroom, one living area, and a small kitchen.

The question is not what the salesperson wants to sell you. The question is: what does a 1 BHK home actually need?

Direct answer. A 1 BHK Indian home needs a 1kW solar system without AC or a 2kW system with AC. Monthly consumption is 150 to 350 units. The MNRE benchmark cost after the PM Surya Ghar subsidy is ₹20,000 (1kW) or ₹40,000 (2kW). Using the True Cost of Going Solar framework, payback is the net cost divided by the yearly saving (4.4 and 2.7 years in the worked example on assumed net costs). Do not let anyone oversell you a 3kW system for a genuine 1 BHK load profile, it will not pay back faster and may waste roof space you do not have.

This guide walks through the exact load calculation for a 1 BHK home, the 1kW vs 2kW sizing decision, subsidy details, net cost, and the right inverter to choose.

1 BHK Load Profile: What You Actually Consume

Before sizing a solar system, you need to know your actual load. Here is a realistic 1 BHK load profile across two scenarios:

Scenario A: 1 BHK Without AC (typical north-facing or renter apartment)

Recommended system: 1kW on-grid solar, generating 3.5 to 5 kWh/day (105 to 150 units/month), covers 50 to 70% of consumption.

Scenario B: 1 BHK With 1-Ton AC (own house, hot climate)

Recommended system: 2kW on-grid solar, generating 7 to 10 kWh/day (210 to 300 units/month), covers 55 to 75% of consumption including the AC.

How Peak Sun Hours Affect a 1 BHK System’s Output

One factor most buyers overlook is that the same 1kW system generates very different amounts of electricity depending on your location’s peak sun hours in India:

These peak sun hour values are planning ranges, not measured data for your site; check yours on the Global Solar Atlas. On the table’s mid-points, a Jaipur homeowner with 1kW generates about 5.25 ÷ 3.6 = 1.46 times what a Kolkata homeowner with the same 1kW system does (46% more), so payback for the Jaipur buyer at a lower tariff can still be faster than for the Kolkata buyer at a higher one.

The True Cost of Going Solar for a 1 BHK

The True Cost of Going Solar framework identifies five cost components for any solar system. For a 1 BHK:

1. Solar panels: 2 to 4 panels of 500–550 Wp. See the dated panel listings in the solar panel price guide.
2. Inverter (on-grid): priced by model; ask for the exact model and its written warranty.
3. Balance of System (BOS): Mounting structure, cables, junction box, SPD, earthing, net meter interface.
4. Installation and commissioning: Labour, civil, DISCOM application, following the same residential solar installation process EPCs use nationwide.
5. GST: the 12% slab no longer exists. Panels are named at Schedule I entry 437 at 5%, the inverter is 5% or 18% by classification, and a bundled turnkey contract uses the 70:30 split for an 8.9% effective rate.

The benchmark is the scheme’s reference cost (13 February 2024), not a market price. Component-wise costs (panels, inverter, BOS, installation, GST) have no dated source in this guide, so none are shown; compare itemised written quotes.

₹60,000. The PM Surya Ghar Muft Bijli Yojana central subsidy for a 2kW residential system - ₹30,000 per kW. For a 1 BHK homeowner, this subsidy covers 60% of the MNRE benchmark cost at 1 and 2 kW, which makes solar affordable for modest homes. Source - MNRE PM Surya Ghar Portal{target=“_blank” rel=“noopener”}, 2026.

For the complete PM Surya Ghar application process, eligibility criteria, and state-level add-on subsidies, read the PM Surya Ghar complete guide.

1kW vs 2kW: The Sizing Decision for a 1 BHK

This decision deserves an honest table. Many installers push 2kW even for no-AC homes because margins are higher on larger systems.

Payback Period for a 1 BHK Solar System

The 2kW system pays back faster in absolute years because the higher consumption home saves more per unit of solar generated. This is consistent with what the solar payback period methodology shows for different consumption levels.

Which Inverter for a 1 BHK?

For a 1 BHK solar installation, three things matter most in inverter selection (the complete solar inverter buying guide covers the full evaluation framework for any home size):

• ALMM listing: Mandatory for PM Surya Ghar subsidy. Verify before purchase.
• Warranty length: At ₹12,000–₹25,000 inverter cost, a 5-year warranty is the minimum; a model-specific written warranty means you will never replace the inverter during the panel’s 25-year life.
• Local service network: For a small residential system, you need someone who can come out within 3 days of a fault. Remote support or a Delhi-based call centre is not sufficient for a Tier-2 city owner.

For the full 1kW system cost breakdown including component-level verification, read the 1kW solar system price guide and the 2kW solar system price guide.

On-Grid vs Hybrid for a 1 BHK Home

For most 1 BHK owners in cities, on-grid is the right choice. The hybrid system adds the cost of a hybrid inverter and battery for a 1 BHK, and is only justified where power cuts are long and frequent enough to need backup. The on-grid vs hybrid comparison provides a city-by-city analysis.

Common Mistakes 1 BHK Buyers Make

• Buying a 3kW system on the salesperson’s advice: A 3kW system for a 200-unit/month 1 BHK will export most of its generation to the grid at a net metering rate that may be lower than the tariff you pay. The payback advantage disappears and you spend ₹50,000–₹70,000 more unnecessarily.

• Not checking net metering eligibility: Apartment dwellers need to confirm that the DISCOM meters their unit individually (not the entire building) and that net metering is permitted in the building’s electricity connection terms.

• Ignoring installation quality: A 1kW system has only 2 panels. Saving ₹2,000 on a cut-rate installer who does not earth the system correctly creates a genuine safety risk, better to find a vetted local installer than the cheapest bidder. The BIS certification mandate under IS 16221 and the CEA safety standards are non-negotiable for all grid-connected residential installations in India.

• Forgetting to apply for net metering: Without a bi-directional net meter from your DISCOM, surplus solar power is wasted. The net metering application guide walks through the process state by state.

Qbits model documentation

• Hybrid Inverters: Review current QBH model documents and confirm the exact battery, firmware, PV, backup-output, transfer, communication, warranty and project requirements in writing.
• String Sizing Calculator: Confirm your 1–2kW panel string is correctly configured before ordering.
• Authorised Service Partners: Search the current directory, then confirm partner status, location coverage, service scope, response process and fees in writing.

Contact Qbits with the exact model, site inputs and documents relevant to the request. Confirm the responsible party, deliverable, fees and response time after submission.