Solar Array & Battery Sizing for Gold Mines in Mali: A Practical Method
Introduction
Array and battery sizing decides whether a solar pump delivers water when you need it—and how much it costs. This article walks through solar array and battery sizing for gold mines, using Mali’s hot, sunny Sahel sites as the worked example, written by the solar-pumping specialists at KINBO. Get the sizing wrong and the pump either stalls on a cloudy afternoon or you overspend on panels you don’t need. Done well, a Mali site pumps reliably through the long dry season with near-zero fuel.
Table of Contents
The Sizing Goal
- Match energy to duty—the array must supply the pump’s daily energy (kWh) at the site’s real irradiance, not nameplate.
- Right-size the battery—only add storage if you must pump off-sun (night, cloud, or continuous process).
- Build in margin—dust, ageing panels and the weakest-sun month all erode output; size for the worst month.
- Tie to hybrid if needed—where a small generator or grid backs the site, sizing shifts (see our hybrid systems guide).
Mali Duty Profile
Mali’s gold mines—the southern belt around Sadiola and Morila, plus artisanal pits—face intense sun and a long dry season, with a short, dusty wet season. Our dewatering guide, process-water guide and community-water guide frame the duties; Mali’s high irradiance means a smaller array covers the same duty, but the wet-season dust and cloud demand battery or hybrid margin.
Step-by-Step Sizing Method
- Daily water need (m³) × total head (m) × 9.81 ÷ pump efficiency = daily pump energy (Wh).
- Array watts = daily energy ÷ (sun-hours × system efficiency), sized to the weakest-sun month.
- Battery (Ah) = desired off-sun runtime × load ÷ voltage × DoD factor—only if night/cloud pumping is required.
- Controller & pump rated to the duty with headroom; our sizing methodology applies directly.
Battery vs No-Battery Design
| Factor | No-battery (daytime solar) | With battery buffer |
|---|---|---|
| Capital | Lower | Higher |
| Pumping window | Sun hours only | 24 h / cloudy days |
| Maintenance | Minimal | Battery care |
| Best for | Dewatering, daylight duties | Continuous process |
For the economics, our solar-vs-diesel analysis shows Mali’s high irradiance drives fast payback, often under 2 years, especially with a no-battery daytime design.
Frequently Asked Questions
Do I always need a battery?
No—if the duty is daytime (most dewatering and community supply), a no-battery design is cheaper and simpler; add storage only for night or continuous process pumping.
Why size to the weakest-sun month?
Because the pump must still perform in the cloudiest, dustiest period; sizing to the annual average leaves you short exactly when you need water most.
How much margin should I add?
Typically 15–25% for dust, panel ageing and temperature; more if the site is very dusty or has long cloudy spells.
How do I start a project in Mali?
Define flow, head, water quality and hours, then we size the array, pump and buffer—our sizing methodology applies directly.
Related Articles
- Gold Mine Solar Pump Sizing Methodology
- Hybrid Solar-Diesel Pump Systems for Gold Mines
- Solar vs Diesel Cost Analysis for Gold Mines
- Explore KINBO Solar Pump Products
Get a Right-Sized Solar Pump System for Your Gold Mine
Tell KINBO your Mali or Sahel site’s duties—pit, treatment circuit or community borehole—and we will size the array, pump and buffer to your real irradiance and season. Contact our team for a tailored quote.
Published by KINBO · September 29, 2026 · Category: Application Cases
