The d.Light X-series (X500, X850, X1000, X2000) is a family of Solar Home Systems produced by d.Light Design that provide solar powered lighting, device charging and can power one or more appliances including a solar LED TV or Fan.
The X-series SHSs provide home lighting, device charging and appliance powering capabilities through an energy system composed of a solar panel and a lithium iron phosphate battery. Systems include two to four hanging LED bulbs and an LED tube light each with wall switches as well as a d.Light TV (size varies from 19″ – 32″). Larger models also offer a portable torch and an FM radio, and a compatible d.Light fan can be purchased separately and powered by the system. The systems have Pay-As-You-Go functionality, the battery pack has an LCD screen to indicate state of charge and the LED bulbs are fully dimmable.
The X-series SHSs are sold by online retailers and locally through d.Light’s 25,000 retail outlets across 70 countries worldwide.
The X-series competes with kerosene lamps and solar lanterns for household and business lighting, though these typically cannot provide charging capabilities and cannot power appliances.
The primary competitors for the X-series SHSs are other solar home systems with capacity to power appliances such as The 1kWp Pack from SolarNow, the Azuri 50W, TV120 Solar Home System from Azuri Technologies Ltd., the Simpa Solar Home System from Simpa Networks, the Mobisol Solar Home System from ENGIE Mobisol GmbH, the M-KOPA IV Solar Home System from M-KOPA Solar, the Barefoot Connect 620 from Barefoot Power, the BBOXX Kit from BBOXX and the SELCO 50W Module from Selco.
Goal 7: Affordable and clean energy
The product is mass produced in China.
Users purchase the d.Light D180 Solar Home System directly from one of d.Light’s partners with 25,000 retail outlets across 70 countries worldwide or online.
No data is available on distributions of the d.Light X-series.
Beyond the X-series, d.Light have sold over 20 million solar lights and power products in over 65 countries through the four centers in Africa, China, South Asia and the United States, based on calculations done using d.light’s developing world sales and United Nations and International Finance Corporation research.
Number and type of power outputs
Number and type of light points
Manufacturer-specified lumen-hours per solar day
Peak power rating of the solar panel in standardized sunlight conditions, provided by the manufacturer
Manufacturer-specified battery capacity
Manufacturer-specified battery voltage
Type of battery used
Can the user easily replace the battery if needed?
Can this system be monitored remotely?
Type of user payment structure
Does this system require mobile connectivity (either for payments or to function)?
The specifications for the d.Light X-series vary for different models. Those currently available are the X500, X850, X1000 and X2000, however the best summary of the specifications for each is provided by Lighting Global‘s specifications sheet from their testing of this product family.
The systems include a solar PV module ranging from 25 – 80 Wp, a 12.8 V lithium iron phosphate battery ranging from 5600 mAh – 12,000 mAh, two to four hanging LED bulbs (200 lm), an LED tube light (400 – 600 lm) and a d.Light TV. The TVs vary from 19″ to 32″ HD displays with in-built DVBT-2 or DVBT-2+S2 tuner and the largest TV also includes a CI slot. Optional on smaller X-series models and included with larger are a portable torch (75 lm LED; 1800 mAh, 3.7 V battery) and an FM radio (1000 mAh, 3.7 V battery).
The battery and solar controller unit has 3 USB outlets and shows the credit remaining based on current Pay-as-you-go payments and current battery level on an LCD screen.
Products within the 2 year warranty period (from the date of purchase) can be returned to the retailer at a user’s point of purchase for replacement free of charge. Beyond that, d.Light provide customer support (contact details available here).
Except for the FM radio, torch and TV remote which are covered by a 1-year warranty, the product has a 2-year warranty covering manufacturing defects.
5+ years lifetime
D.Light specify that the X-series is capable of “lighting up your entire home with bright lights”, “powering larger d.Light appliances” (including a solar LED TV or fan) and “charging multiple mobile phones and other small, USB-powered devices”.
For the larger models, users can “us[e] the FM radio to stay up-to-date on important news or relax with music” and use the torch as portable lighting inside and outside. They also intend for the users to be able to upgrade their d.Light X-series with additional LED bulbs, up to 8.
The product pages for different X-series models indicate that it should emit light 40x – 60x brighter than kerosene.
Lighting Global confirmed that the d.Light X-series (described as SHS Family) complies (verification document) with the Lighting Global Quality Standards by testing according to the Quality Test Method given in edition 3 of IEC/TS 62257-9-5. The results can be found here and certification is valid until August 30, 2020.
The testing categories (all passed) are: Truth In Advertising; Lumen Maintenance; Circuit and Overload Protection; AC-DC Charger Safety; Wiring and Connector Safety; Hazardous Substances Ban; Battery Protection; Battery Durability; PV Overvoltage Protection; Miswiring Protection; Physical Ingress Protection; Water Ingress Protection; Drop Test; Soldering and Electronics Workmanship; Mechanical Durability; Cable Specifications; User Manual; Component Specification and Replacement; Minimum Warranty Terms; Performance Reporting.
The X-series Solar Home Systems are a plug and play devices, however, electrical installation and control guidelines provided by d.Light must be followed to avoid electrical shocks.
d.Light commercializes multiple solar products from solar lanterns and solar home systems to solar appliances. Several of the appliances including a d.Light fan and additional LED bulbs can be powered by the X-series but are not included with the system purchase.
2017, Welfare impacts of an entry-level solar home system in Uganda. Journal of Development Effectiveness, 9(2), pp. 277-294.
Esper, H., London, T. and Kanchwala, Y., 2013, Access to clean lighting and its impact on children: An exploration of solaraid’s sunnymoney. Child Impact Case Study No. 4, William Davidson Institute, Ann Arbor, Michigan.
IDinsight, 2015, d.light Solar Home System Impact Evaluation. IDinsight Report.
Institute of Developing Economies, 2015, Impacts of Solar Lanterns in Geographically Challenged Locations: Experimental Evidence from Bangladesh.
Lemaire, X., 2018, Solar home systems and solar lanterns in rural areas of the Global South: What impact? WIREs Energy Environ, 7(5), e301.
Narayan, N., Vega-Garita, V., Qin, Z., Popovic-Gerber, J., Bauer, P., Zeman, M., 2020, The Long Road to Universal Electrification: A Critical Look at Present Pathways and Challenges. Energies, 13(3), pp. 508.
Excepting the paper from Narayan et al. (2020) which mentions the d.Light X850, these pieces of research are not specifically about the d.Light X-series, but highlight the value solar home systems can provide in resource constrained environments.
This product meets the Lightning Global Quality Standards for Solar Home System Kits valid until August 30, 2020. Through the same testing by Lighting Global, it was found to also comply with IEC Technical Specification 62257-9-5.
The X-series was tested using the Quality Test Method (QTM) by Lighting Global in the Shenzhen Academy of Metrology and Quality Inspection in China. This is the full test method within IEC Technical Specification 62257-9-5 used by Lighting Global to verify comprehensive product performance. Results from QTM testing determine if a product meets the Lighting Global Minimum Quality Standards and IEC Technical Specification 62257-9-5.
As part of the QTM, the d.Light D30 has passed the following tests: Truth In Advertising; Lumen Maintenance; Circuit and Overload Protection; AC-DC Charger Safety; Wiring and Connector Safety; Hazardous Substances Ban; Battery Protection; Battery Durability; PV Overvoltage Protection; Miswiring Protection; Physical Ingress Protection; Water Ingress Protection; Drop Test; Soldering and Electronics Workmanship; Mechanical Durability; Cable Specifications; User Manual; Component Specification and Replacement; Minimum Warranty Terms; Performance Reporting.
Results can be seen here.
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