Your three options
Modelled generation, grid imports, export income, first-year savings and simple payback. The battery is assessed on its extra cost and extra savings.
Home Solar Decision Check · by Tramevolt
Two solar quotes.
One clearer decision.
Different prices. Different battery sizes. Different savings claims. Tramevolt compares up to two quotes for your home in England and turns them into a clear written decision: what differs, what is missing and what to ask before you sign.
Request my £79 review See the worked example£79 GBP total · one home in England · PDF + calculation tables · five working days after accepted complete file, verified payment and agreed start date.
One homeUp to two quotesWritten review in English
What you receive
A reasoned answer to
“What makes sense for us?”
Like-for-like scope
Up to two cash-price quotes compared, with equipment, included work and unknown costs separated. No invented local installation price.
What could change it
Key sensitivities, missing information and prioritised questions for your installer. We can conclude that the evidence is insufficient.
See what arrives in your inbox
A report you can read.
Calculations you can inspect.
These are actual pages from our fictional worked example. Open a page to enlarge it, or read the complete four-page PDF.
01 / The decisionOptions, upfront budgets and the battery’s extra savings. Open full-size →
02 / The quote comparisonTwo fictional quote options, assumptions and exclusions. Open full-size →
03 / The calculationsEnergy flows and how changed assumptions affect the result. Open full-size →FICTIONAL DEMONSTRATION. The property, quotes, tariffs and consumption profile are invented. Historical solar output is modelled with PVGIS. These pages demonstrate the method, not a prediction for your home.
Read the full sample PDF →FICTIONAL DEMONSTRATION — NOT A CUSTOMER RESULTA battery can lower imports
FICTIONAL QUOTE A · SOLAR ONLY FICTIONAL QUOTE B · SOLAR + BATTERY
A battery can lower imports
without being the better investment.
This fictional Bristol household uses 4,500 kWh a year. Its solar output uses PVGIS historical modelling; consumption, prices and quote options are invented.
£7,600 GBP
- 4.5 kWp solar array
- Standard equipment, labour and scaffolding assumed included
- No battery
£11,100 GBP
- Same 4.5 kWp solar scope
- 5 kWh usable battery
- £3,500 extra installed cost assumed
Both invented quotes exclude roof repairs, abnormal electrical upgrades and future maintenance. Network costs and actual warranties are not established. The prices are illustrative, not local installation offers.
| Option | Upfront budget | Annual saving* | Simple payback |
|---|---|---|---|
| No installation | £0 | — | — |
| Solar only | £7,600 | £691 | 11.0 years |
| Solar + battery | £11,100 | £842 | 13.2 years |
The battery adds about £151 a year for an extra £3,500: a marginal simple payback of 23.2 years, before ageing or replacement. That does not establish that it will repay its cost in its usable life.
*Versus no installation. Assumed flat rates: import 25p/kWh, export 12p/kWh. Standing charges are excluded equally. Finance, maintenance, degradation, replacement, future tariff changes and discounting are not modelled. These are not guaranteed savings.
The questions this comparison puts to the installer
- Is the solar scope identical in both prices, including labour and scaffolding?
- What battery saving remains after deducting the export income you give up?
- Which roof, electrical or network costs are excluded from the budget?
For this fictional case, solar alone has the shorter simple payback. The battery conclusion remains conditional on real use, tariffs, warranties, ageing and replacement costs.
Open the four-page fictional report →The right scope
For a real decision.
With the right evidence.
- A single-family home in England, owned by you or shared with the owner's permission.
- One or two installation quotes for an outright cash purchase.
- Fixed import and export tariffs; battery charged from surplus solar only.
- Your electricity use, roof information and equipment assumptions can be checked.
This is an indicative financial comparison, not an installation design, site survey or engineering certification. We do not validate roof structure, electrical safety, MCS compliance or network approval.
What we need
Only the data needed for your review.
- 12 months of consumption and, where available, a full year's half-hourly or hourly data.
- Your import/export prices and relevant tariff conditions.
- Up to two redacted quotes, including equipment, warranties and included/excluded work.
- Roof orientation, slope and shading information, with its source.
Remove account numbers, bank details, signatures and other unnecessary identifiers. Never send passwords. Send documents only after your scope and collection instructions have been agreed.
No interval data? We may only offer clearly labelled scenarios using several assumed profiles. A single assumed profile is not enough for a personalised battery recommendation.
Outside this pilot: dynamic or time-of-use tariffs, overnight grid charging, backup/off-grid systems, leases, loans/PPAs, complex existing systems, or guaranteed costs and performance.
A small, hands-on service
Your data, checked.
Your options, explained.
The £79 review covers checking your inputs, comparing quotes, running traceable calculations and explaining the result. The review is prepared manually with reproducible calculations; it is not an instant automated estimate.
Check the scope before payment
We review suitability and missing data first. If the case needs a site specialist or a model we do not support, we say so.
Agree the file, price and start date
The written scope and any assumptions are confirmed before the order is paid. The five-working-day delivery period starts after complete-file acceptance, confirmed payment and the agreed permitted start date.
Receive your report and calculations
Manual document review and interpretation are supported by reproducible calculations and a quality check. You receive a PDF, calculation tables and one written clarification.
A review of your quotes, not a generic estimate
Know what you are comparing.
Know what to ask next.
- Up to two cash-price quotes for one home in England.
- A PDF decision summary and traceable calculation tables.
- Clear assumptions, exclusions and questions for your installer.
- One written clarification within seven days of delivery.
Prepared manually with calculation tools. Scope confirmed before payment.
Before ordering
A few important distinctions.
Why pay when free calculators and forums exist?
Free tools may be enough, and you should use them if they answer your question. This review provides a traceable comparison based on your files, including quote scope and the battery's incremental case. You can inspect the fictional sample before requesting a review.
Will you tell me exactly what to install?
No. We provide an indicative decision comparison and questions for your installer. Site conditions, equipment, design, safety and approvals remain with appropriately qualified local professionals. A result may be “not enough evidence to decide.”
Can the report say that a battery is not justified?
Yes. A battery is assessed against solar alone, including the export income lost when solar is stored. Lower grid imports do not automatically mean better financial value.
Is the work done manually?
Yes. The service combines manual input and quote checks with reproducible calculations. AI tools assist preparation; they are not a substitute for checking source data and calculations. This is not an instant automated estimate or a UK-certified installation design.
Can I cancel or choose when work starts?
The proposed pilot terms provide a 14-day cancellation period from contract formation. This free enquiry does not create a service contract. Starting earlier requires your separate express request and acknowledgement; otherwise the delivery date follows the waiting period. For this pilot, cancellation before report delivery receives a full refund. Statutory rights remain. Final terms and seller details must be supplied before payment.
How is my enquiry handled?
Our contact form sends your enquiry through FormSubmit to tramevolt@gmail.com, for a manual scope check. Read the privacy notice. Do not submit private documents at this stage.
When will payment be requested?
Only after suitability, complete-file requirements, scope, final total price, seller details and applicable terms have been confirmed. You receive payment instructions after written scope acceptance. View the PayPal payment process.