You already have solar — what next?
Most existing-solar questions come down to three things: should you add a battery, can you switch to a smart tariff like Octopus Agile, and what to do when your inverter dies in year 12.
If you installed under the Feed-in Tariff (pre-2019) you're probably exporting most of your generation for a tariff-locked rate. Adding a battery shifts the maths: you self-consume more, but you may breach FIT terms if the install isn't AC-coupled correctly.
We're building a dedicated retrofit planner — battery sizing for existing arrays, AC-vs-DC coupling guidance, FIT-compatible inverter swaps, and tariff arbitrage calculators. Sign up below and we'll let you know when it's live.
In the meantime, the main planner handles new battery sizing reasonably well if you ignore the panel recommendations.