Why Home Energy Planning Matters

Solar PV systems and battery storage work best when they are sized and configured around how your household actually uses energy. A system sized for a household with high daytime use will perform very differently for a household where most electricity is used in the evening. Home energy planning helps align system design with realistic usage patterns.

Home energy planning is not a guarantee of savings or performance — it is a practical step towards understanding what solar and battery options are likely to be relevant for your home, based on real usage data and known household routines.

Understanding Your Electricity Usage

Your household electricity consumption — measured in kilowatt-hours (kWh) per day, month, or year — is a fundamental input to solar system design. Key questions include:

What is your average annual electricity consumption?
What time of day does most of your electricity use occur?
Which appliances use the most energy?
Do you work from home? Are occupants home during the day?
Do you currently heat your home with electricity (heat pump, storage heaters)?

Daytime vs Evening Use

Solar panels generate electricity during daylight hours. Households that use more electricity during the day — working from home, daytime appliance use, daytime cooking — can self-consume a greater proportion of their solar generation. Households with most consumption in the evening benefit more from battery storage to store solar energy for later use.

Understanding your usage profile helps identify whether a solar-only system, a solar-plus-battery system, or a specific battery capacity is more appropriate for your household.

EV Charging Considerations

Electric vehicle charging at home can significantly increase household electricity consumption. The timing, frequency, and method of EV charging (slow overnight charging vs faster daytime charging) affects how much solar generation can be used for vehicle charging, and what battery capacity might be relevant if vehicle charging is an important energy goal.

Smart EV chargers that can be programmed to charge during solar generation periods or off-peak tariff windows are available, but their interaction with solar systems, batteries, and tariffs requires careful planning. EV charging integration should be reviewed as part of any home energy planning discussion.

Tariff Considerations

Energy tariffs in the UK have evolved significantly. Time-of-use tariffs (where electricity costs vary by time of day), export tariffs (where you receive payment for surplus solar electricity exported to the grid), and smart tariff products interact with solar and battery systems in different ways.

Tariff availability, rates, and eligibility rules change regularly and are controlled by energy suppliers, grid operators, and government policy. Krisis Solar does not set tariff rates, control tariff availability, or guarantee tariff income. Independent tariff review from an energy supplier or independent energy adviser is recommended for decisions involving tariff-based financial planning.

Smart home energy monitoring display — Smart energy monitoring helps households understand when solar generation is highest and when to shift demand — informing battery sizing, EV charging schedules, and tariff choices.

Battery Sizing and Usage Patterns

Battery storage capacity should reflect realistic household usage, not theoretical maximum benefit. Oversized batteries cost more and may rarely be fully utilised. Undersized batteries may not cover evening demand. Battery sizing discussions are informed by your usage data, solar system size, and usage routines.

Future Energy Needs

Anticipated changes to your household's energy use — a planned heat pump installation, adding a hot tub, plans to have children, home office expansion, or EV purchase — can significantly affect optimal solar system size and battery capacity. Where these future changes are known or planned, they should be discussed as part of home energy planning.

Export Assumptions

When solar generation exceeds household consumption, surplus electricity is typically exported to the grid. Export tariff rates are currently available through the Smart Export Guarantee (SEG) and similar supplier schemes, but rates vary between suppliers, may change, and are not guaranteed for the lifetime of a solar system.

Export income assumptions should be treated as indicative only. Long-term financial projections based on fixed export rates should be reviewed with appropriate independent advisers.

Energy Behaviour and Household Routines

Household routines — when appliances run, how heating is used, whether the home is occupied during the day — are important planning factors. Running major appliances (dishwasher, washing machine, tumble dryer) during solar generation hours can improve self-consumption. These behavioural aspects of solar optimisation are discussed as part of home energy planning.