Saldering ends on 1 January 2027. See which home battery stores your leftover solar power for the evening and pays for itself, worked out from a year of your own meter data.
Replaying a year of meter data…
This is a made-up household. to see your numbers.
| Battery | Size | Efficiency 800 / 200 W | Standby |
|---|
Efficiency is how much stored power comes back out; it drops at low power, which matters at night when a house draws a steady 200–300 W. The label next to each value says where it comes from: hover or tap it for details.
— kWh of solar went to the grid; this battery would have kept — kWh of it.
| Batteries | Storage | Power cost a year | Saves a year | Price | Paid back in | Profit after 15 yrs |
|---|
The monthly payment is an advance that's settled once a year, so you can lower it by about what the battery saves. The welcome discount comes with or without a battery, so it doesn't speed up the payback.
For every hour of the year, solar power you would have sent to the grid charges the battery instead (up to its charge power), and the battery then powers your home (up to its discharge power) until it's empty. Part of the energy is lost on the way, at the efficiency that matches that hour's power.