Self-consumption
Every kWh your roof produces and you use on site replaces a kWh bought at the local tariff. What you cannot use is exported at the local export credit — or stored for later.
PV production × self-consumption share × avoided tariff
What we calculate
Five value streams. One battery. Twenty years.
A battery earns in several ways at once, but it is still one battery: energy reserved for backup cannot be sold in arbitrage that same hour. The configurator co-simulates the streams instead of adding them up — the number you see is the number you can bank on.
The value stack
Illustrative composition for a mid-size industrial site — the mix shifts per country. Where a market has no capacity tariff, peak shaving is simply absent; where the grid is unreliable, backup dominates.
Annual value, year 1 No numbers shown on purpose — yours come from your own data in step 7.
Backup
Expected outage hours × the share of your load that must keep running × the diesel cost you avoid. Probability-weighted between a normal year and a crisis year, from official reliability statistics.
outage hours × critical load × avoided diesel cost per kWh
Peak shaving
Where the grid operator bills your monthly peak, the battery caps it. Only computed in markets with a capacity tariff — and at the right tariff for your voltage level.
peak reduction kW × capacity tariff per kW
Arbitrage
Charge when energy is cheap or your roof over-produces, discharge when buying is expensive. Margin is buy price minus export credit, on the battery capacity that is not reserved for backup.
throughput kWh × (buy − export) margin
EV charging
Charging your fleet or visitors on your own solar instead of the public network. Priced on the local avoided AC/DC charging cost and the hours the chargers are actually in use.
charged kWh × avoided public price
Co-simulation
One state of charge for all streams: the backup reserve lowers what arbitrage and peak shaving can use, hour by hour. Adding five separate business cases would overstate the result — we never do.
one battery · one dispatch · one honest number
Then twenty years of cash flow
Capex from real component prices in the local currency, including import duties and VAT where they apply. Twenty years of savings, indexed with the local energy-price inflation and degraded for panel ageing. Out come payback, IRR and a cash-flow chart — the same figures in the case-study PDF.
Local currency, excluding VAT
Local energy-price inflation
Sources and confidence per value
Same numbers in the PDF
Questions about the calculation
Can the five value streams be added together?
No. They share one battery, so the configurator co-simulates them hour by hour: the backup reserve lowers what arbitrage and peak shaving can use. Adding separate business cases would overstate the return.
Is peak shaving included in every country?
Only where the grid operator bills a capacity tariff on your monthly peak. Markets that bill per kWh only have no peak-shaving stream, and the configurator leaves it out rather than inventing one.
Which horizon and inflation do you use?
Twenty years, indexed with the local energy-price inflation of each country. Panel degradation and battery cycling are included.
Are prices including or excluding VAT?
Excluding VAT — the configurator is for businesses. Import duties and VAT are added per component where the country levies them, and shown as separate lines.