HYBRID SOLAR + BATTERY ENERGY SOLUTION
Apartment Hotel Case Study | 24/7 Essential Power & Lower Grid Consumption
Project Goal: keep essential hotel services running 24/7 while using solar and battery energy as much as possible.
1. PROJECT BACKGROUND
Customer Requirements
- 24-hour power support for room lighting and Wi-Fi.
- Reduce electricity cost by using battery energy instead of grid power whenever practical.
- Limited rooftop area for solar panels.
- Keep grid and diesel generator as reliable backup sources.
- Provide a simple, automatic and easy-to-manage energy system.
Project Site
The building is under construction, making this the best stage to separate essential and non-essential electrical circuits.
Recommended approach:
Create a dedicated Critical Load distribution board for lighting, Wi-Fi, reception, CCTV, access control and other essential loads.
2. RECOMMENDED HYBRID ENERGY ARCHITECTURE
Solar power is used first. Surplus solar energy charges the battery.
At night or during high electricity-price periods, the battery supplies selected hotel loads.
The grid remains available when battery energy is low, while the diesel generator provides emergency backup during extended outages.
/ Inverter
Reception · CCTV
Access Control
Air Conditioning
Kitchen Equipment
3. LOAD PRIORITY & STRATEGY
💡 CRITICAL LOAD (BATTERY-BACKED 24/7)
Room LED lighting, Wi-Fi, reception, CCTV, access control
📺 PRIORITY LOAD (BATTERY WHEN CAPACITY ALLOWS)
TV, refrigerator, selected sockets, office equipment
❄️ HEAVY LOAD (GRID / GENERATOR PRIORITY)
Air conditioning, water heater, kitchen and other high-power loads
4. PRELIMINARY SYSTEM SIZE
| Equipment | Initial Recommendation |
|---|---|
| ☀️ Rooftop PV | Approx. 50 kWp high-efficiency N-type modules |
| ⚡ Hybrid PCS / Inverter | Approx. 60 kW, three-phase |
| 🔋 Battery Storage | Approx. 120 kWh LiFePO4 |
| 🏭 Grid Connection | Yes |
| ⚙️ Diesel Generator Integration | Yes |
| 📊 Energy Management System | Remote monitoring + automatic control |
5. HOW THE SYSTEM WORKS
Solar supplies hotel loads first; surplus energy charges the battery.
Battery supplies critical and selected priority loads to reduce grid consumption.
Grid automatically supports the hotel and can recharge the battery when required.
Battery immediately supports critical loads. Generator starts only when necessary.
EMS monitors PV generation, hotel consumption, battery SOC, grid power and generator operation.
6. EXPECTED BENEFITS
24/7 Support
Essential hotel services remain powered.
Lower Costs
Reduce grid electricity consumption.
Less Diesel Use
Reduce generator operating hours.
Better Experience
Better guest experience during outages.
Expandable
Ready for future hotel load growth.
Remote Monitoring
Easier operation and maintenance.
A practical hybrid solution for an apartment hotel with limited rooftop space, designed to balance reliability, energy savings and investment cost.