Off-Grid Solar Lighting System for Prefab Site Cabins
This off-grid kit is built to provide reliable lighting power for a 26-32 (L) × 12 (W) × 8.2 (H) ft prefabricated cabin and similar site cabins. It’s designed for temporary and moving sites: quick to assemble, straightforward to take down, and easy to relocate to the next job. The cabin has 500 lux illumination in any point.
The core of the system is the P5000M 5000W 5120Wh all-in-one portable power station in an IP65 cabinet, with an integrated inverter 5000W, battery storage 5120Wh, up to 7000W solar panels and two MPPT solar chargers.
The solar array is roof mounted using a Van der Valk ballasted flat roof mounting kit at a 10° tilt. You can choose either:
- 5 panels in portrait, with south orientation (long side of the cabin is E-W oriented), or
- 6 panels in landscape, with east-west orientation (long side of the cabin is N-S oriented).
A reserve 3.2kW generator and 230V to 110V site transformer are optional.
Why this setup works well on site
Generator runs efficiently, not all night at low load:
The P5000M includes Automatic Generator Start (AGS). Instead of a generator idling away at very low load on winter nights (for example when you’ve only got one light on, or just security cameras running), AGS lets the system run the generator in shorter, high-output bursts to recharge the battery, then shut down again. That means better fuel efficiency, less noise, and less unnecessary engine run time.
Solar reduces fuel usage and helps with net zero targets:
Solar covers a large chunk of the daily energy demand, so the generator becomes a backup rather than the main power source. That cuts fuel consumption and emissions, and helps construction companies evidence progress toward net zero targets, especially on projects where welfare cabins and perimeter lighting run for months.
Robust kit for time-critical, high-profile projects:
The core components are chosen for durability: double-glass bifacial panels with high mechanical loading ratings, and an IP65 power unit with LiFePO₄ batteries rated at 4,000+ cycles.
Advice, design services, unlimited customisation options available:
Construction projects take place in a wide variety of environments and at different scales. From a single family home to a major infrastructure project, our team can design, supply and support a kit to meet your requirements. Just get in touch - use live chat, call 020 8064 0335 or email info@energian.co.uk for advice and a no-obligation quote
Post-purchase support:
Our team are available to travel to your site during setup and operation to assist with any support requirements.
Key Features
All-in-one design for simpler installation:
The P5000M is factory assembled and tested, reducing typical installation time to under three hours. It uses a rugged IP65-rated enclosure for protection against dust and water ingress, suitable for indoor or outdoor deployment.
Seamless generator integration with AGS:
AGS can manage generator operation based on load, battery state-of-charge, or time schedules. Used correctly, the generator runs for shorter, higher-output periods instead of long low-load runtime, improving fuel efficiency and reducing wear.
Reliable and intelligent energy distribution:
The built-in energy management system balances solar, battery, and generator power automatically. AC output includes leakage protection, with load prioritisation to keep critical loads running.
What’s included
- 1 × P5000M 5.12kWh Portable Power Station
- 5 × or 6 × DMEGC 500W N-type Double Glass Bifacial Solar Panel
- 1 × Van der Valk Solar Mounting Kit (10° tilt)
- Optional: 1 x 230V/110V Step Down Transformer 3kVA
- Optional: 1 × Hyundai HY3200SEi 3200W Petrol Inverter Generator
The system includes cables, disconnectors, and accessories to complete your installation. User manuals and wiring diagram included.
Full Specifications
DMEGC 500W N-type Double Glass Bifacial MC4-EVO2 Solar Panel
| Rated (peak) power (Wp): 500W in Standard 1000w/m2 solar light |
| Open circuit voltage (Voc): 44.7V (Vmp = 37.66V) |
| Short circuit current (Isc): 14.22A (Imp = 13.30A) |
| Efficiency: 23.1% |
| Cell type: Mono-crystalline Silicon |
| Connector type: MC4-EVO2 |
| Certification: IEC 61215 / IEC 61730 / CE |
| Panel size: 1950 × 1134 × 30 mm |
| Net weight: 26.8kg |
The panels are designed for hard use, with a quoted mechanical rating of 5,400Pa snow load and 2,400Pa wind load, and a 30-year product warranty. (As standard for this panel model.)
P5000M Portable Power Station
| Battery capacity: 5120Wh |
| Battery chemistry: LiFePO4 |
| Nominal battery voltage: 48Vdc |
| Continuous power output: 5000W 220-240VAC 50Hz |
| Output waveform: Pure sine wave |
| Maximum PV input power: 3500W per each MPPT charger |
| Number of MPPT Chargers: 2 |
| Maximum solar input voltage: 500V |
| Maximum solar input current: 14A |
| Maximum input mains AC power: 5000W |
| Cycle life: 4,000+ cycles (at 25°C, at 80% depth of discharge) |
| Ingress protection: IP65 |
| Operating temperature: 0°C to 40°C |
| Size (W × H × D): 722 × 809 × 399mm |
| Net weight: 93kg |
Built using LiFePO₄ chemistry for long cycle life and safer performance in demanding environments.
230V/110V Step Down Site Transformer 3kVA (Optional)
| Input voltage: 230V |
| Output voltage: 110V |
| Output socket: 1 × 32 Amp |
| Ingress protection: IP20 |
Hyundai HY3200SEi 3200W Petrol Inverter Generator (Optional)
| Model: Hyundai HY3299SEi |
| Maximum power: 3,200W / 3.2kW |
| Continuous power: 2,800W / 2.8kW |
| Fuel consumption: 1.7lL/hr @ 100% load; 1.056L/hr @ 50% load |
| Phase: Single |
| Voltage: 240VAC |
| Frequency: 50Hz |
| Engine model: DJ170F |
| Engine type: 4-Stroke Forced Air-Cooled |
| Engine size: 210cm3 |
| Max power output: 5.4hp |
| Fuel: Petrol |
| Fuel capacity: 7.8L |
| Engine oil: 10w40 / 15w40 |
| Engine oil capacity: 600mL |
| No. of cylinders: 1 |
| Noise level @ 7m: 69db(A) |
| Net weight: 39.6kg |
| Fully assembled dimensions (H × W × L): 604 × 456 × 540mm |
Where to use
- Prefab cabins and welfare units used as site offices or secure storage
- Temporary lighting and power needs on construction sites
- Projects where reduced generator run time and lower fuel use matter (noise restrictions, running costs, emissions reporting)
- Remote or constrained locations where grid connection is not practical or not allowed
Installation & safety requirements
The system must be installed by a qualified electrician.
Need help with installation? Contact us at info@energian.co.uk or call 020 8064 0335 for a quote.
Delivery
Approximately one week within the UK (longer to the Highlands, islands and Northern Ireland).
Shipping & contact
Shipping is available to the UK, Ireland, Africa, the Caribbean and worldwide. If your shipping rate is not shown at checkout, contact us on +44 20 8064 0335 or info@energian.co.uk for a quote.
Any questions? Call 020 8064 0335, WhatsApp 07418 607250, or email info@energian.co.uk.