Compare the same electricity production across direct use, battery storage and export, including local tariff risks. Check the site data and official sources before signing.
Decision to make
Compare the same electricity production across direct use, battery storage and export, including local tariff risks. Adapt this decision to the building, your actual consumption and the project schedule.
For this project, start by identifying the grid operator, applicable tariff and site constraints. The quotation must specify the conditions affecting connection, metering or the value of surplus electricity.
Practical effects of the project
- The recovery framework from 2027 must be read as a dated hypothesis: the tariff, the DNO contract and the rule applicable to your installation must appear separately.
- The first profile is the household present during the day: self-consumption can already valorize a large part of solar energy without batteries.
- The second is the household absent during the day but active in the evening: a battery can displace part of the production, with losses and replacement costs.
- The third adds a heat pump, boiler or controllable terminal: moving a load can be simpler and cheaper than storing each kWh.
- The fourth produces a lot of surplus: it must test decline in recovery, hourly spot price, injection limitation and contractual risk instead of promising an annuity.
These points help assess the topic ‘ Battery or solar injection in 2027: compare four consumption profiles ’ without turning a national average into a local promise. Every decisive figure needs its source, date and scope.
Specific controls
- Year and source of each 2027 hypothesis in the simulation.
- Comparison of direct self-consumption, battery, injection and capping.
- Purchase and recovery price of the DSO identified for the address, with duration and conditions of the contract.
- Sensitivity to a less favorable trade-in price and a battery replaced during the duration of the project.
The answers should appear in the quote or in a dated appendix. A verbal explanation is insufficient if it changes the price, expected output, financial support or a contractual obligation.
Compare quotes
- Tariffs: state the purchase price, surplus remuneration and fixed charges applicable to the site, with their source and date.
- Production: provide a monthly estimate with orientation, shading, losses and weather assumptions.
- Investment: separate material, installation, safety, scaffolding, connection, procedures and options.
- Aids: distinguish confirmed amount, estimate and deposit liability.
- Contract: specify guarantees, calendar, deposit, exclusions, maintenance and after-sales service.
Compare the same electricity production across direct use, battery storage and export, including local tariff risks. In the comparison table, keep one column for the stated value, one for the evidence provided, and one for the effect of a less favorable hypothesis.
Cautious scenario
Test the project with slightly lower production, an unconfirmed grant and less favourable surplus remuneration. This scenario shows whether the decision remains sound based on self-consumption, roof quality and a controlled installed cost.
The main references used are Federal Council - Payment for taking back solar electricity from 2027, Swissolar - New remuneration model and hourly spot price, OFEN/BFE - Connection conditions and remuneration 2026, Swissolar/VSE - Local solar power models 2026. They frame the method, but the local amounts and contractual conditions must be rechecked at the time the offer is signed.
Risks to be managed
The fourth produces a lot of surplus: it must test decline in recovery, hourly spot price, injection limitation and contractual risk instead of promising an annuity. Ask who assumes this risk, what proof will be provided and how a change is handled after ordering.
A more expensive solution should meet a specific need in your project. Ask for a documented benefit and a separate price for each option.
Next step
Gather the address, annual consumption, future electricity uses and building documents. Then check the grid operator's conditions, available grants and site constraints; request quotations covering the same scope.
Compare the same electricity production across direct use, battery storage and export, including local tariff risks. You can then decide with a documented net price, clear responsibilities and assumptions that each company can explain line by line.
Points to check
- Tariffs: Compare the tariff for your address with the Swiss ElCom median for 2026, keeping local prices separate from the national benchmark.
- Grants: Check the programme, eligibility, documents and deadlines with Pronovo, the canton or municipality. Include only confirmed contributions in your budget.
- Roof potential: Sonnendach is presented as a public pre-diagnosis, to be validated by a technical visit.
- ROI: the method separates self-consumption, injection, installed price, taxation and payment schedule.
- The recovery framework from 2027 must be read as a dated hypothesis: the tariff, the DNO contract and the rule applicable to your installation must appear separately.
- The first profile is the household present during the day: self-consumption can already valorize a large part of solar energy without batteries.