Calculate remaining grid imports after solar and the cost they carry.
Solar reduces the variable part of a bill but not the standing charge, so bills never fall to zero. The residual import is whatever consumption falls outside generation hours. Standing charges have risen in many markets, which caps the percentage saving solar can deliver however large the array.
Solar Import
Imports = consumption − solar self-consumed; bill = imports × rate + standing charge
Imports = consumption − solar self-consumed; bill = imports × rate + standing charge Solar reduces the variable part of a bill but not the standing charge, so bills never fall to zero. The residual import is whatever consumption falls outside generation hours.
Standing charges have risen in many markets, which caps the percentage saving solar can deliver however large the array.
This calculator takes 5 inputs: Annual consumption, Annual solar generation, Self-consumption rate, Import price per kWh, Daily standing charge. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.