| ā | Energy density | Life cycles | Cycle efficiency | Investment level | Suitability to climatic conditions | Space required |
| Energy density | (1, 1, 1) | (1/6, 1/5, 1/4) | (1/8, 1/7, 1/6) | (2, 3, 4) | (1/9, 1/9, 1/9) | (6, 7, 8) | Life cycles | (4, 5, 6) | (1, 1, 1) | (1/6, 1/5, 1/4) | (2, 3, 4) | (1/6, 1/5, 1/4) | (5, 6, 7) | Cycle efficiency | (6, 7, 8) | (4, 5, 6) | (1, 1, 1) | (4, 5, 6) | (1/8, 1/7, 1/6) | (7, 8, 9) | Investment level | (1/4, 1/3, 1/2) | (1/4, 1/3, 1/2) | (1/6, 1/5, 1/4) | (1, 1, 1) | (1/8, 1/7, 1/6) | (7, 8, 9) | Suitability to climatic conditions | (9, 9, 9) | (4, 5, 6) | (6, 7, 8) | (6, 7, 8) | (1, 1, 1) | (1/4, 1/3, 1/2) | Space required | (1/8, 1/7, 1/6) | (1/7, 1/6, 1/5) | (1/9, 1/8, 1/7) | (1/9, 1/8, 1/7) | (2, 3, 4) | (1, 1, 1) |
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