One plain definition at a time.
Watts measure a moment of power; watt-hours measure stored energy. Terms like usable energy, idle overhead, duty cycle and peak sun hours matter most when a power cut is the reason you are planning.
Power and energy terms
Watts, watt-hours, capacity, continuous output, surge watts, usable energy, system efficiency, idle overhead, duty cycle and peak sun hours each answer a different question. Mixing them is the most common sizing mistake.
Electricity, plugs and batteries
AC and DC, Vmp and Voc, series and parallel, MPPT, LFP and UPS are defined in the shared glossary. For India, add the socket question: Type D primary household sockets, unearthed Type C equipment and higher-current Type M connections are not interchangeable.
India pilot status: commerce closed. English is one entry point for India, not a claim that India is exclusively English-speaking. Hindi and other Indian-language editions can attach to this shared country layer after their own editorial and release reviews.