Environment 01
Best Solar Panel Angle in India for Every Month
Month-by-month solar panel tilt for Delhi, Mumbai, Bengaluru, Chennai, Kolkata and Jaipur, why the monsoon makes the best fixed angle steeper, with numbers.
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Technology 02
How Long Will a 150Ah Battery Last With Fans, TV and a Fridge?
Two fans, four bulbs, a TV and a fridge get about 3 hours from a 150Ah tubular battery, not the 3.6 the brochure formula says. Here is the maths and the fixes.
Physics 03
How Many Solar Panels Do I Need for My House?
Size rooftop solar from your bill: 350 units a month in Delhi needs about 3 kW, six 540 W panels. Generation, roof, subsidy and payback worked out.
Technology 04
How Many Units Do an AC, Fridge and Geyser Use Per Day?
A 1.5 ton AC uses about 4.2 units in 8 hours, a 240 L fridge 0.7 a day, a 2 kW geyser 2 an hour. The maths, a real Delhi slab bill and what to change.
Physics 05
How Many Units Does a 1.5 Ton AC Use per Hour?
A 1.5 ton 5 star inverter AC uses about 0.86 units an hour at 35 °C outside and 24 °C inside. Worked examples for star ratings, thermostat and tariffs.
Physics 06
How Much Does an LED Bulb Save in a Year?
A 9 W LED gives the light of a 60 W bulb and saves about 93 units, ₹652 a year at 5 hours a day. CFLs, tube lights, slab tariffs and payback, worked.
Physics 07
How Much Electricity Does a Geyser Use? Units and Cost
A 25 litre geyser heating four 20 litre baths a day uses about 86 units a month, ₹604 at ₹7. Heating time, standing loss, instant, heat pump and solar.
Physics 08
Is an Electric Scooter Really Cheaper to Run Than Petrol?
An Ather 450X costs about ₹0.27 a km charged at home against ₹1.70 for a petrol Activa. Worked examples, break-even on the price, and electric cars.
Technology 09
Why EVs Charge Slowly After 80 Percent (the Charging Curve Explained)
A Nexon.ev goes from 10 to 80 percent in 40 minutes on a 60 kW charger, then needs about 35 more for the last 20. Here is the charging curve, the chemistry behind it, and what it means for time and cost.