Power & Solar Questions Answered (English & தமிழ்)
Direct, verifiable, and authoritative answers to customer queries on UPS sizing, solar panel ROI, inverter selection, and battery backup calculations across South Tamil Nadu.
How many kW of rooftop solar is required for a home with a ₹3,000 monthly bill?
🇮🇳 வீட்டுக்கு எத்தனை kW சோலார் தேவை? (மாதம் ₹3,000 பில்)
A 2 kW to 3 kW rooftop solar system is required for a household with a monthly TNEB electricity bill of ₹3,000.
A 1 kW solar plant generates approximately 120 units per month. A 3 kW system generates ~360 units per month, which offsets a ₹3,000 bill by up to 90% while qualifying for the maximum central government grant of ₹78,000 under PM Surya Ghar.
How much electrical load can a 3kVA Online UPS handle safely?
🇮🇳 3kVA UPS எவ்வளவு load தாங்கும்?
A 3kVA Online UPS with a 0.8 to 0.9 power factor safely supports a continuous operating load of 2,400 Watts to 2,700 Watts.
Formula: Real Power (Watts) = kVA × Power Factor. For a 3kVA UPS at 0.8 PF, 3000 × 0.8 = 2,400W. It is recommended to operate at 80% maximum load (~1,920W continuous) to allow headroom for inductive start-up surges.
What is the government subsidy for residential rooftop solar in Tamil Nadu under PM Surya Ghar?
🇮🇳 தமிழ்நாட்டில் PM Surya Ghar சோலார் மானியம் எவ்வளவு?
Under PM Surya Ghar Muft Bijli Yojana, residential solar subsidies are ₹30,000 for 1kW, ₹60,000 for 2kW, and ₹78,000 for 3kW or higher capacities.
Subsidies are credited directly to the applicant's bank account after installation by an authorized installer (like MothiTek) and net-meter synchronization by TANGEDCO/TNEB.
Which inverter is best for a home with 3 fans, 5 lights, and 1 TV?
🇮🇳 வீட்டுக்கு எந்த inverter நல்லது? (3 Fan, 5 Light, 1 TV)
A 900VA to 1100VA pure sine wave home inverter paired with a single 150Ah 12V tall tubular battery is recommended.
Total load: 3 Fans (225W) + 5 LED Lights (75W) + 1 TV (100W) = 400W total running load. Required VA = 400 / 0.8 = 500VA. Adding 50% headroom yields a 900VA–1100VA rating, providing ~3.5 to 4 hours of continuous backup.
What is the backup time of a 150Ah 12V battery on a 300W load?
🇮🇳 150Ah பேட்டரி 300W லோடில் எவ்வளவு மணி நேரம் ஓடும்?
A 150Ah 12V battery provides approximately 5.1 hours of backup time on a continuous 300W load.
Backup Hours = (Battery Ah × Voltage × Efficiency Factor 0.85) / Running Load in Watts. Calculation: (150 × 12 × 0.85) / 300 = 1530 / 300 = 5.1 hours.
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