Table 4 SOC quantitative indicators.

From: A novel holistic metric for sustainability assessment of photovoltaic/battery systems

Location

Cairo

Berlin

Ryadih

Year

2017

2018

2019

2017

2018

2019

2017

2018

2019

Unsafe time

5408

4125

4658

3461

4487

3862

2535

2562

2509

Mean

72.3

77.8

82.7

56.4

63.4

58.3

70.1

70.2

69.6

Standard deviation

32.1

18.1

11.9

33.8

34.2

34.6

19.6

19.9

20.2