ITI Solar Technician Electrical (AITT Theory)

It is the all-India theory examination sat at the end of the ITI Solar Technician (Electrical) trade under the Craftsman Training Scheme. It assesses trade theory across electrical fundamentals, PV modules and components, system sizing, installation and maintenance, safety, and grid interconnection. Practical competence is examined separately through trade practical and workshop calculation.

Trade theory papers in this trade are typically a mix: objective multiple-choice items plus short descriptive and numerical questions where you write out calculations and label sketches. Treat it as a written paper and practise writing concise answers with units, formulae, and final values clearly shown, not just ticking options.

The National Council for Vocational Training and the Directorate General of Training publish the current scheme of examination, including paper duration, marks distribution, and minimum pass marks for theory and practical separately. These figures change between revisions, so check the official DGT/NCVT notification or your institute's examination cell rather than relying on older batches.

Most candidates find the electrical fundamentals, sizing calculations, and protection/earthing sections hardest, while safety and general PV awareness are easier. The paper rewards accuracy over breadth: a candidate who can confidently do series–parallel resistance, energy-yield estimates, and cable and fuse selection usually clears comfortably.

Yes, supplementary or re-examination attempts are normally available for failed subjects, but the exact rules on allowed attempts, fees, and the period within which you must clear pending subjects are set by NCVT/DGT and vary by session. Confirm the current re-examination policy with your ITI examination cell before your result is declared.

Start with electrical fundamentals and measuring instruments, since every later topic depends on them. Then basic electronics, wiring and earthing, PV cell and module fundamentals, batteries and charge controllers and inverters, system sizing, installation and maintenance, safety and first aid, and finally net metering and estimation. Finish with timed practice on numerical problems.

Expect to size a PV array from daily energy demand and peak sun hours, work out series and parallel module combinations against inverter and charge-controller voltage windows, compute battery capacity with depth of discharge and autonomy days, estimate voltage drop and choose cable size, and calculate power, energy, efficiency, and power factor in DC and AC circuits.

Common ones: mixing up series and parallel rules for voltage and current, ignoring depth of discharge or inverter efficiency in battery sizing, confusing module open-circuit voltage with maximum-power voltage when checking controller limits, omitting units, and describing earthing or protection vaguely. Writing a formula, substituting values, and stating the unit prevents most lost marks.

No. This is an independent study resource prepared for candidates searching for the exam. Always verify the syllabus, examination scheme, and result procedures against the official DGT/NCVT publications and your own institute's notices, which take precedence over any third-party guide.