Project location: Sofia, Bulgaria.
Daily load: 1,500 kWh/day.
What SolaraBox Provide: three 40ft off-grid solar container units working together in parallel to deliver the full site demand.
Each 40ft off-grid solar container produces approximately 500 kWh/day under local solar conditions, so three units matched the 1,500 kWh/day need with operational redundancy. Using multiple containers allows load sharing, staged commissioning, and simpler maintenance without shutting down the whole camp.
If the customer had used diesel, costs and emissions would be far higher. At diesel price USD 1.408 per liter and roughly 4 kWh per liter, the cost per kWh from diesel is 1.408 / 4 = USD 0.352/kWh. Our off-grid solar container system delivers generation at about USD 0.05/kWh. With a daily use of 1,500 kWh, switching from diesel to our off-grid solar container saves (0.352 − 0.05) × 1,500 = USD 453 per day.
Those savings add up quickly. The solution saved the client USD 453 every day. Over 30 days the saving is USD 13,590; over a year it is about USD 165,345. Beyond cost, the off-grid solar container removed the logistics of fuel supply and reduced onsite emissions significantly.
| Type of container | 40 Feet High Cube Open Side |
External Dimensions (L*w*H/mm) | 12192*2438*2896(L'W'H/mm) |
Total weight (Tons) | 22.17 |
Compatibility(option 1) Orientation | AC output with inverter Any ozimuth by container |
Solar Panel Type | N Type i-Topcon |
Solar Panel Power(Pmaxwp) | 500W per module Tier 1 |
String capacity(Pmax/kwp) | 168.00 KWP |
Output Power Volt.¤t(V/Hz) | 220/380,230/400,3L/N/PE or 3L/PE |
Inverter Brand | GOODWE/SINENG |
Certification | TÜV tested, CE-certified |
Production at our factory took 35 days. Shipping and transport took 25 days. Before shipment we fully commissioned each off-grid solar container so that on arrival the system was plug-and-play.
Installation
On-site deployment took 4 hours to position, connect, and commission the three units. The foundation need was simple: Just a level and compacted ground was enough. With minimal civil work, the solar containers go into service fast.
For the Sofia site we used a north–south row layout with panels facing true south to capture maximum sunlight across the day. The north–south alignment minimizes shading between rows as the sun moves east to west, keeping production balanced in the morning and afternoon. This arrangement suits Sofia’s latitude and ensures each container receives consistent solar irradiation.
The client used the power immediately and reported no quality issues. We provided detailed after-sales documentation and remote monitoring instructions so the client could track production, battery health, and load distribution. Our remote support team monitors system data and helps solve any questions. The robust design and factory commissioning meant reliable operation with minimal downtime.
Choosing this off-grid solar container approach brought clear benefits:
Lower operating cost: USD 453 saved per day compared to diesel at the stated rate.
Lower carbon emissions: replacing diesel with our containers cuts CO₂and local pollutants for every operating day.
Fast deployment: factory-tested units go from delivery to operation within hours.
Operational simplicity: modular units are scalable and easy to service.
Strong ROI: ongoing fuel savings and lower maintenance improve project economics quickly.
We also designed the system so the units can be expanded or reallocated to other sites when the mine’s needs change. When one site winds down, the units can be transported and redeployed, preserving asset value and reducing waste. The combination of economics, ease of use, and environmental benefit makes our approach a clear alternative to traditional diesel solutions.
We thank the client for trusting SolaraBox. Beyond daily electricity demand, the social and environmental impact of solar is significant. Reducing diesel use improves air quality around the camp, lowers noise pollution, and removes fuel handling risks. For short-term mining projects this means better working conditions for staff and less disturbance to local communities. From a corporate perspective, choosing renewable power improves sustainability reporting and reduces exposure to volatile fuel prices.
If you read this case and want to explore off-grid solar container options for your project—mining camps, construction sites, emergency response, or remote worksites—please send your load and timeline. We will respond with a tailored plan and a clear cost estimate for deployment.
SolaraBox — fast, clean power where you need it.
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