A single-number ranking hides what is being optimised. Here there are two axes at a time, and the question «which are the best» is answered by those nobody beats on both measures.
On Cost of stored energy, further left is better; on Nominal capacity, higher up. The coloured corner, “best zone”, is where both measures are good.
Filled in is the 1 product that no other beats on both measures. It is not «the best»: it is the one nobody dominates.
Striped, paler points have at least one of the two measures without a verified source.
27 sheets are missing, because they do not state both measures.
| Product | Cost of stored energy · €/kWh | Nominal capacity · kWh | Verified |
|---|---|---|---|
| Huawei LUNA2000-21-S1 | 0.28 | 20.70 | Partly |
| Huawei LUNA2000-7-S1 | 0.29 | 6.90 | Partly |
| Huawei LUNA2000-14-S1 | 0.32 | 13.80 | Partly |
