ITI Solar Technician Electrical (AITT Theory) study plan

Solve series, parallel and series-parallel DC resistance networks using Ohm's law and Kirchhoff's laws, showing every step of the working

Compute RMS, average and peak values, frequency and phase relationships for single-phase AC waveforms, and contrast them with three-phase star and delta quantities

Demonstrate correct use of a multimeter, clamp meter, insulation resistance tester and earth resistance tester on a practice board, and state what each reading proves

Select cable cross-sectional area for a given load using current-carrying capacity, derating factors and permissible voltage drop

Distinguish the purpose and application of MCB, MCCB, RCCB, RCBO and fuse, and choose the correct device rating and breaking capacity for a described circuit

Explain TN-S, TN-C-S, TT and IT earthing arrangements and justify the protective device coordination each one requires

Describe the procedure for measuring earth electrode resistance and state acceptable limits for a PV installation

Identify wiring faults (open circuit, short circuit, earth leakage, reversed polarity) from described symptoms and specify the test that confirms each

Explain the photovoltaic effect from photon absorption through electron-hole pair generation to current flow, and relate irradiance and cell temperature to I-V curve shape

Read a module datasheet and extract Voc, Isc, Vmp, Imp, Pmax, temperature coefficients, NOCT and system voltage rating, then calculate the temperature-corrected Voc at the lowest expected site temperature

Compute the effect of partial shading and mismatch on a series string, and state how bypass and blocking diodes limit the loss

Describe the construction and function of the diode, BJT as a switch, thyristor and MOSFET, and explain where each appears in PV balance-of-system equipment

Explain how a PWM and an MPPT charge controller differ in operating point and when each is appropriate

Compare flooded lead-acid, AGM, gel and lithium iron phosphate batteries on cycle life, depth of discharge, charging profile and maintenance, and select one for a stated duty

Calculate battery bank capacity in Ah and kWh from daily energy demand, days of autonomy, depth of discharge and inverter efficiency, then verify the C-rate is within the battery's specification

Interpret charge controller and inverter datasheets: MPPT voltage window, maximum PV input current, surge rating, efficiency curve and anti-islanding capability

Explain array-to-inverter DC:AC ratio, clipping loss, and when oversizing the array is economically justified

Build a full load estimation table from appliance power, quantity, daily hours and a diversity factor, and convert it to daily and peak demand

Size a complete off-grid system end to end: array kWp from peak sun hours and system losses, controller rating, battery bank, cable sizes and protection ratings

Size a grid-connected system from a target annual yield using specific yield and performance ratio, and predict monthly output

Read and produce single-line diagrams and layout drawings using correct electrical symbols, and scale a drawing from a stated ratio

Prepare a bill of quantities and cost estimate for a described rooftop system with labour, mounting and balance-of-system line items

Sequence a rooftop installation from site survey and structural check through mounting, module placement, DC cabling, earthing and AC connection

Specify the commissioning test set: open-circuit voltage per string, short-circuit current, insulation resistance, polarity, earth continuity, inverter start-up and anti-islanding verification, with pass criteria for each

Diagnose five described field faults (string underperformance, hot spot, ground fault, inverter derating, communication loss) and state the test and corrective action for each

Write a preventive maintenance schedule with task, interval and acceptance criterion for modules, batteries, controllers, inverters and cabling

Apply the isolation, lockout-tagout and prove-dead sequence to a PV array, and explain why the DC side remains live under sunlight even with the AC isolator open

Demonstrate the first-aid response to electric shock and to arc-flash burns, including safe approach, CPR sequence and when defibrillation applies

State the fire-safety precautions for PV installations: arc-fault and ground-fault protection, DC isolator placement, and the hazards firefighters face from energized conductors

Explain net metering, bidirectional metering, feed-in tariff versus net feed-in settlement, and the interconnection requirements a grid-tied inverter must satisfy

Describe anti-islanding, grid voltage and frequency ride-through, power factor and harmonics limits, and why each matters to the distribution utility

Complete two full-length timed mock papers under exam conditions and record the score per domain

Re-study only the two weakest domains, reworking every missed question to a correct worked solution

Recite from memory the key formulas for Ohm's law, power, three-phase quantities, battery capacity, array sizing, voltage drop and string voltage limits

Review safety, earthing and net metering points one final time, since these carry high marks per unit of study effort