What is the minimum required backup or autonomy for a solar lighting system?

The system must provide rated light output for a minimum of 3 consecutive cloudy/no-sun days (Clause 5.2).

What protection is required for the battery?

The charge controller must include a Low Voltage Disconnect (LVD) to prevent deep discharge and a High Voltage Disconnect (HVD) to prevent overcharging (Clause 8.2.1).

What is the warranty requirement for the PV module?

The PV module must be warranted for a minimum of 10 years, with power output not decreasing by more than 10% during this period (Clause 6.3).

What are the main components of a system as per this standard?

A PV module, a rechargeable battery, a luminaire, a charge controller, and interconnecting wires/cables (Clause 4.1).

IS 15651

: 2006

Solar PV lighting systems - Specification

CurrentFrequently UsedSpecificationMEP · Solar and Renewable Energy Installations

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This standard specifies the requirements for design, performance, and testing of standalone solar photovoltaic (PV) lighting systems. It covers key components including the PV module, battery, charge controller, and luminaire to ensure reliability and a minimum level of performance for applications like street and domestic lighting.

Specifies the requirements for solar photovoltaic (PV) lighting systems, including components, performance, and testing.

Quick Reference Values

Nominal system voltage12 V DC

Minimum system autonomy3 consecutive no-sun/cloudy days

PV module degradation warrantyOutput not to fall below 90% of rated power in 10 years

Battery type specifiedTubular plate lead acid with low antimony, rated at C/10

Maximum allowable battery depth of discharge (DoD)75%

Minimum charge controller efficiency85%

Low Voltage Disconnect (LVD) setting11.2 V (± 0.2 V)

Low Voltage Reconnect (LVR) setting12.5 V (± 0.2 V)

Practical Notes

Ensure the battery capacity and PV module wattage are correctly sized for the specific geographic location's solar insolation and required autonomy.

Pay close attention to the battery type (e.g., C10 tubular lead-acid) specified, as using an incorrect type (like automotive) will severely impact system life and performance.

Verify that all individual components have their own valid BIS certification as referenced in the standard, especially the PV module (IS 14286) and battery (IS 1651).