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Zorowatt vs optisizer

Where optisizer is strong, where it falls short, and what changes if you switch. Every number can be checked on their site.

optisizer (Switzerland) is a web tool that sizes PV and batteries from a load profile, for peak shaving and self-consumption, licensed per project or per year, with white-label and an API as paid extras. Zorowatt sizes the battery against the site's rebuilt bill under sourced Dutch, German and Romanian tariffs. (optisizer.ch)

Short answer
When to pick optisizer
Pick optisizer if you sell in Switzerland or Germany and want load modelling for EV fleets, priced per project.
When to pick Zorowatt
Pick Zorowatt if you want the white-label report included in Pro, the bill checked against the invoices, Dutch and Romanian tariffs, and a lower price per analysis.

Facts about the other tool read on 2026-10-30 from the pages linked in each cell. Prices and features change; check the vendor's page before you rely on one.

FeatureZorowattoptisizer
PriceFree €0 · Starter €49 / month · Pro €149 / month · Enterprise on requestBasic €290 per project; Pro €1,900 a year (10 projects); Premium €5,900 a year (100); Enterprise €9,900 a year (unlimited); excl. VAT, billed annuallyoptisizer.ch · 2026-10-30
Meter data import and checks15-minute or hourly data from CSV, Excel, German MSCONS or Green Button files, or a year of values with no dates; gaps, duplicates, daylight saving time and kW / kWh mix-ups flagged, never filled silentlyThe load profile is the basis of every calculation; a load-profile modeller adds EV charging and fleetsoptisizer.ch · 2026-10-30
TariffsVersioned 2026 tariffs, each with its source: Netherlands (Liander, Stedin, Enexis, plus the ACM 2028 draft as a scenario), Germany (NEW Netz, Netze BW, RheinNetz, levies and Stromsteuer), Romania (ANRE zones). Any other country: a generic template where you enter the ratesPurchase and feed-in prices; Dutch and Romanian tariffs not mentionedoptisizer.ch · 2026-10-30
Battery dispatchRule-based, with the optimal (LP) dispatch as the upper bound; every saving is billed by the same bill enginePeak-shaving and self-consumption sizingoptisizer.ch · 2026-10-30
FinancialsNPV, IRR and payback, with degradationPaybackoptisizer.ch · 2026-10-30
Client reportPDF report for the client; white-label on ProPDF reports per module; a brand-free report costs €1,000 extra, custom colours €500optisizer.ch · 2026-10-30
Try before buyingFirst site analysis free, no card30-day free trial and a free consultationoptisizer.ch · 2026-10-30
LanguagesWebsite, free tools, Workspace and PDF report in English, Dutch, German and RomanianGerman (site)optisizer.ch · 2026-10-30
APINo API for customers yetLight API as an add-on, €6,000optisizer.ch · 2026-10-30

In short

optisizer prices by project volume and sells white-label (€500–1,000) and an API (€6,000) as extras. Zorowatt's Starter costs €588 a year for up to 36 analyses, single analyses cost €15, and Pro includes the white-label report. optisizer's load modeller for EV fleets goes further than Zorowatt's added-load block.

Price per year

optisizer
Pro €1,900 a year for 10 projects; Basic €290 per project
Zorowatt
Starter €588 a year (€348 at the founding price) · Pro €1,788 a year for 3 seats · single analyses €15

As each vendor's page states it; prices in other currencies are not converted.

How to switch

Upload the load profile you used in optisizer as CSV or Excel.

  1. Upload the site's meter data to the free data checker or the Workspace: every assumption made reading the file is listed.
  2. Pick the site's tariff and enter the invoices: the bill check shows whether the baseline matches before anything is sized.
  3. Size the battery, compare it with your earlier study, and send the client the PDF report.

Questions

How much does optisizer cost?
Basic is €290 per project; Pro €1,900 a year for 10 projects, Premium €5,900 for 100 and Enterprise €9,900 unlimited, excl. VAT and billed annually; a brand-free report is €1,000 extra and the API €6,000 (optisizer.ch, read on 2026-10-30). Zorowatt Starter is €49 a month for 3 site analyses, then €15 each; Pro is €149 a month with a white-label report and 3 seats. Your first site analysis is free, with no card.
Is the white-label report extra in Zorowatt?
No. Zorowatt Pro includes the white-label PDF report with your logo, for three seats.
Does Zorowatt model EV fleets?
Partly. In connection-limit mode you add a block of new load, such as EV chargers, in chosen hours, and Zorowatt finds the smallest battery that keeps the site under the limit. It does not simulate individual vehicles.
Free tools

Try it on your own file first

Both tools run in the browser with no account; the file is not uploaded.

Looking for a optisizer alternative?

Zorowatt runs in the browser, reads the site's own meter data and rebuilds its bill before it sizes anything.

optisizer alternative for C&I battery studies in Europe →

Switching?

Bring a site you already studied: upload its meter data and bills, and set the result next to your old one.

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