German appliance manufacturer Bosch has made public test results of its combined inverter-battery for residential solar use suggesting that the product has a service life of 36 years.

Bosch BPT-S 5 Hybrid, which is fitted with an energy management system to switch between solar, stored and grid power, was put through ageing tests by the independent Institute for Power Electronics and Electrical Drives, RWTH Aachen University and the Centre for Solar Energy and Hydrogen Research Baden-Württemberg in Germany.

The cyclical and calendar service life of the batteries, which are made by SAFT of nickel- cobalt-aluminium technology (NCA), were put to the test.

The study found that the equivalent of more than 10,000 full cycles is achieved over a period of five years at a 60 per cent depth of discharge.

In calendar ageing tests at 25 °C over four years, the battery cells didn’t show any significant signs of ageing.

In an accelerated ageing test, in which the cells were heated to 55 °C, the batteries lost only 10 per cent of their original capacity over a period of four years.

Ghada Merei, a researcher at the Institute for Power Electronics and Electrical Drives, said: “By extrapolating the results gathered until now, our tests show that these types of cell can achieve a service life of up to 36 years.

“This exceeds the average market service life by more than 150%.”

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