NEDO, Sharp and Toyota have announced a plan to commence public road trials of electrified vehicles fitted high-efficiency solar batteries. The public road trials start from late July 2019 aim to assess the effectiveness of improvements in cruising range and fuel efficiency from the technology.

Sharp has ‘modularised’ its solar battery cells previously developed for a NEDO-led project, to create an onboard solar battery panel. Toyota installed this panel on the roof, hood, rear hatch door, and other parts of its “Prius PHV” and has produced a demo car for the public road trials.

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By enhancing the solar battery panel’s efficiency and expanding its onboard area, Toyota says it was able to achieve a rated power generation output of around 860 W, which is approximately 4.8-times higher in comparison with the commercial model Prius PHV (equipped with a solar charging system).

In addition to substantially boosting its power generation output, the demo car employs a system that charges the driving battery while the vehicle is parked and also while it’s being driven, a development that Toyota claims will lead to considerable improvements in electric-powered cruising range and fuel efficiency.

Toyota plans to conduct the trials under various driving conditions in Toyota City, Aichi Prefecture, Tokyo, and other areas. Various data, including the power generation output of the solar battery panel and the amount the drive battery is charged, will be obtained and verified, and then used in the development of an onboard solar recharging system. Toyota plans to share a selection of trial data results with NEDO and Sharp. The PV-powered Vehicle Strategy Committee (PV: photovoltaic), sponsored by NEDO and other entities will evaluate the benefits based on improvements in CO2 emissions reductions and convenience, such as the number of times a vehicle requires recharging.

The goal is to contribute to the creation of a new solar battery panel market, including the transport sector, and find solutions for energy and environmental issues.

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The demo car is equipped with a solar battery panel that utilises several solar battery cells with a conversion efficiency of 34 percent-plus. The shape of the module, environmental durability, surface materials, and other factors are based on specifications for driving trials implemented by Toyota. The solar battery cell is a thin film about 0.03 mm in thickness. This, Toyota says, makes it possible to efficiently install the film to fit the curves of parts with limited space, including the vehicle roof, hood, and rear hatch door. The rated power generation output of the demo car is approximately 860 W.

Previously, the Prius PHV charged the driving battery only while the vehicle was parked. However, with improvements in power generation output, the demo car employs a system that charges while the vehicle is being driven. This is expected to boost the BEV-mode cruising range and fuel efficiency significantly.