Marcel Bonifacio Tirta Wijata

Energy Researcher & Climate Advocate

Projects

Soloptima logo

Soloptima

Sizing and simulation software for hybrid power plants that combine solar PV, battery energy storage (BESS) and diesel generators, with optional wind turbines. Built around a core design question: for a known load and an existing diesel fleet, what PV and battery capacity should be installed, and how should the plant be dispatched?

Hour-by-hour simulation over the full project lifetime, least-cost optimisation of PV and battery capacity, and results carried through to fuel savings, project finance and a complete engineering report. Runs locally on Windows and macOS, with no account or cloud service required.

Crumina logo

Crumina

Self-hosted personal finance application that consolidates bank statements and transaction alerts from a connected mailbox into a single view of accounts, spending and net worth. Mailbox access is read-only, through Gmail OAuth or any IMAP server.

Designed for privacy: no financial data is stored on the server, and no third-party analytics are used. Available as an installable, offline-capable progressive web app (PWA) and a native Android app, in English and Bahasa Indonesia.