Clever storage,
from meter
to payback.
Upload a site's meter data and bill. Zorowatt checks the data, rebuilds the bill, sizes the battery and writes the report.
“A battery proposal is only as good as the load profile and the bill behind it. Zorowatt is built for the consultant with a client waiting: real meter data, the real bill, a report you can explain line by line.”
Four steps. Zoro checks two of them.
Upload once, then try as many scenarios as you like. Zoro checks the two steps a battery case stands on: the data and the bill.
- 01
Upload meter data & bill
Twelve months of 15-minute or hourly data as CSV or Excel, plus the site's bills. Interval length and units are read from the file, not guessed.
- 02
Check & rebuild the bill
Gaps, duplicates, daylight-saving shifts and kW mixed up with kWh are flagged before they skew the result. Then the bill is rebuilt under a versioned tariff and set against the real one.
“3 days are missing in March. Fill them or leave them out?”
- 03
Size the battery & simulate
Battery sizes are tried against the site's year, quarter-hour by quarter-hour, within the grid connection limit: peak shaving, solar self-consumption, or both.
- 04
Report & payback
Savings from the rebuilt bill, then NPV, IRR and payback, in a PDF report for the client. On Pro it carries your logo.
“Every euro in this report comes from the rebuilt bill.”
Priced for consultants, not utilities.
Founding members: Starter at €29 a month instead of €49, for the first 100 organisations.
- 1 full site analysis
- PDF report with watermark
- 1 seat
- 3 site analyses / month, then €15 each
- PDF report
- 1 seat
- 25 site analyses / month (fair use)
- White-label PDF report (your logo)
- 3 seats
Five reasons consultants pick it.
- 01
The bill is checked against the invoices
Zorowatt rebuilds the bill from the meter data and sets it against each invoice, line by line, before it sizes anything. None of the tools we compared says it does this (checked 30 October 2026).
- 02
Dutch, German and Romanian tariffs, with sources
The 2026 tariffs of Liander, Stedin, Enexis, NEW Netz, Netze BW, RheinNetz and the Romanian ANRE zones are built in, each linked to its source. US tools leave European tariffs to you, in dollars.
- 03
Batteries from any maker
A database of 44 commercial products, every spec with its source. The free tools of Sungrow, SMA, Huawei and Victron size their own hardware only.
- 04
Prices on the page, from €0
A free analysis and free tools that need no account; Starter at €49 a month. Furo, Tibo, Gridcog and Energy Toolbase show no price before a call.
- 05
In the browser, in your language
A year of quarter-hours is simulated in about a second, with nothing to install, in English, Dutch, German and Romanian. HOMER, PVsyst and PV*SOL run on Windows.
Zorowatt next to the tools consultants use.
Public facts only, from each vendor's own pages.
| Zorowatt | PeakPilot | Furo | HOMER Grid | Sungrow iSolarDesign | A study by a consultant | |
|---|---|---|---|---|---|---|
| Price | From €0; Starter €49 / month (founding €29); €15 per single analysis | €49 / month without sizing or PDF; €149 per user / month | Not published | $4,200 / year | No price found | €950–2,000 per site |
| Free option | 1 full analysis, plus the calculator and data checker without an account | 3-day trial | Estimate from annual kWh; trial after a demo | 14-day trial | Register with an e-mail address | Sometimes free, as pre-sales |
| Bill checked against the invoices | Yes, line by line | not stated | not stated | not stated | not stated | Depends on the consultant |
| Tariffs built in | Netherlands, Germany, Romania, with sources | Dutch grid operators named as an input | Germany, Austria, Switzerland, Spain; entered by the user | North America | Entered by the user | Depends on the consultant |
| Batteries from any maker | Yes: 44 products, every spec sourced | not stated | Yes: installers store their own systems | Component library | Sungrow only | Depends on the consultant |
| Runs on | The browser | The browser | The browser | Windows | The browser and an app | Days of work |
| Languages | English, Dutch, German, Romanian | Dutch, English | not stated | English | not stated | — |
Checked on 30 October 2026. "Not stated" means the vendor's pages do not say. Every fact, with its source, is on the comparison pages.
What to ask your client for.
Four things, in one e-mail. The checklist says where each one comes from.
- 0112 months of meter data15-minute intervals if the meter has them
- 02The last 12 billsevery page, so the bill can be rebuilt
- 03Grid connection capacitythe contracted and the physical limit, in kW
- 04Solar dataif the site has PV or plans it
Size it right.
Your first site analysis is free. No card, nothing to install.