Lender-grade Solar+BESS feasibility & underwriting API for African C&I — DSCR, 25-yr cashflows, conservative tax logic. Available on Zyla and RapidAPI
Solaris
Deterministic Renewable Energy Underwriting · Africa C&I
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## Commercial product
Solaris is a **paid underwriting API**, not a free calculator and not open-source core.
| Tier | Price | Requests/month | Rate limit |
|:---|:---|---:|---:|
| **Basic** | $24.99/mo | 1,000 | 60/min |
| **Pro** | $49.99/mo | 5,000 | 90/min |
| **Pro Plus** | $99.99/mo | 15,000 | 120/min |
| **Premium** | $199.99/mo | 50,000 | 180/min |
| **Elite** | $499.99/mo | 200,000 | 240/min |
Every tier gets **full access to every endpoint** — the quick screen, the full 25-year model, DSCR covenant tables, scenario stress-testing, batch analysis, and the bankable report payload. There is no free tier and no feature reserved for a higher plan; tiers differ only by monthly request volume and per-minute rate limit. Live pricing and quotas: `GET /pricing`.
→ Subscribe on RapidAPI
→ Subscribe on Zyla API Hub
Docs and methodology are public. The calculation engine is commercial.
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## What Solaris is
> **Most Solar APIs say**
> *“We’ll size your PV.”*
>
> **Solaris says**
> *“We’ll tell you whether a bank should finance this project.”*
Solaris is Africa’s first **computational underwriting engine** for commercial & industrial Solar + BESS projects. It does not stop at technical sizing. It produces lender-grade outputs: 25-year cashflows, full DSCR covenant tables, conservative-by-default tax treatment, scenario stress tests, and structured report payloads — in a single API call.
The philosophy is simple and non-negotiable:
| Principle | What it means in practice |
|:---|:---|
| **Conservative-by-default** | Approval-gated incentives (Free Zone, Pioneer Status, SEZ) are **never** assumed. They apply only when the caller explicitly confirms eligibility. |
| **Single source of truth** | Any value referenced more than once is computed once. Summary fields, covenant tables, and report sections cannot silently disagree. |
| **Lender-legible** | Outputs are structured t …