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Refugee Camp Deployment - Quick Reference

Version: 1.0
Last Updated: 2025-12-20

Complete System Architecture

Power System (Solar + Battery)

☀️ Solar Panel (200W)
        ↓ charges
🔋 Battery (12V 100Ah LiFePO4)
        ↓ powers (12V DC)
┌───────────────────────────────────┐
│  ALL Components Powered Here      │
│  - KOOMPI Mini: 36W               │
│  - Deco AP #1: 10W                │
│  - Deco AP #2: 10W                │
│  - Deco AP #3: 10W (optional)     │
│  Total: 56-66W                    │
└───────────────────────────────────┘

Network Topology (Daisy Chain Mesh)

Configuration for Linear Coverage

[Solar Panel + Battery] ← Powers everything
         │
         │ 12V DC power
         ↓
    [KOOMPI Mini Hub]
         │
         │ Ethernet (eth0) - wired connection
         ↓
    ┌────────────┐
    │   AP #1    │ ← Main Deco (10W)
    │  (Main)    │
    └─────┬──────┘
          │ Wireless Mesh Backhaul (60-80m)
          ↓
    ┌────────────┐
    │   AP #2    │ ← Mesh node (10W)
    └─────┬──────┘
          │ Wireless Mesh Backhaul (60-80m)
          ↓
    ┌────────────┐
    │   AP #3    │ ← Mesh node (10W, optional)
    └────────────┘

Coverage:

  • Linear distance: 150-240m (with 3 nodes)
  • Width per node: 50-80m on each side
  • Total area: 17,000-38,000 sqm in open field

Coverage Zones

Zone Distance from Main AP Signal Quality Streaming Quality Use Case
Primary (AP1) 0-60m Excellent (5 bars) 1080p, no buffering Active learning, streaming
Extended (AP2) 60-140m Good (4 bars) 720p, smooth Extended learning area
Peripheral (AP3) 140-220m Fair (2-3 bars) 480p or caching only Content caching

Hardware List (100-500 Students)

Complete System - $1,280 Total

Item Cost
KOOMPI Mini Server $250
WiFi Mesh (Deco X60 3-pack) $300
Battery (100Ah LiFePO4) $200
Solar Panel (200W) $150
Cables & Mounting $30
1TB SSD $100
Content Server Software $200
Installation $50
TOTAL $1,280

Component Details

KOOMPI Mini Server:

  • Intel N150 (4-core, 3.6GHz)
  • 16GB RAM
  • 1TB SSD included in price above

WiFi Mesh (TP-Link Deco X60):

  • 3-pack WiFi 6 mesh system
  • Coverage: 150-240m linear range
  • Supports 200-400 concurrent devices

Solar Power System:

  • 200W Monocrystalline Solar Panel
  • 12V 100Ah LiFePO4 Battery
  • 30A MPPT Charge Controller (included in mounting costs)
  • Weatherproof battery enclosure
  • All mounting hardware and cables

Power Specifications

Daily Energy Budget

Component         Power   Hours   Energy/Day
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
KOOMPI Mini       36W  ×  8hrs  = 288Wh
Deco AP #1        10W  ×  8hrs  = 80Wh
Deco AP #2        10W  ×  8hrs  = 80Wh
Deco AP #3        10W  ×  8hrs  = 80Wh (optional)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
TOTAL             56-66W × 8hrs = 448-528Wh/day

Battery Capacity

  • Type: LiFePO4 (Lithium Iron Phosphate)
  • Voltage: 12V
  • Capacity: 100Ah (1,200Wh)
  • Usable: 12V × 100Ah × 80% DoD = 960Wh
  • Autonomy: 960Wh ÷ 528Wh = 1.8 days (2 days with 3 APs)

Solar Panel Output

  • Wattage: 200W
  • Cambodia sun hours: 5 hours/day average
  • Daily generation: 200W × 5hrs = 1,000Wh
  • After losses (75%): 750Wh/day
  • Surplus: 750Wh - 528Wh = 222Wh/day (charges battery + buffer)

Learning Center Operations

Daily Schedule

6:00 AM  - Sunrise, solar charging begins
8:00 AM  - Learning center opens
         - KOOMPI Mini + APs powered on
         - Students arrive in shifts

8-10 AM  - Shift 1: 100 students
         - Cache content (30 min/student)
         
10-12 PM - Shift 2: 100 students
         - Peak solar charging
         
12-2 PM  - Shift 3: 100 students
         - Maximum solar output
         
2-4 PM   - Shift 4: 100 students
         
4-6 PM   - Shift 5: 100 students
         - Students complete caching
         
6:00 PM  - Learning center closes
         - System powers down
         - Battery fully charged (or near full)
         
Night    - System off (battery ready for next day)
         - Students learn offline in tents

Student Workflow

Cache & Learn Offline Strategy

1. WALK TO LEARNING CENTER
   └─ Max 200m from furthest tent
   └─ 5-10 minute walk

2. CONNECT TO WiFi
   └─ SSID: "SalaDigital"
   └─ Automatic connection

3. USE MOBILE APP (20-30 minutes)
   └─ Browse courses
   └─ Watch 2-3 videos → Auto-cached
   └─ Download PDFs → Saved locally
   └─ Listen to audio → Cached
   └─ Total cached: 2-3 hours of content

4. RETURN TO TENT
   └─ 5-10 minute walk back

5. LEARN OFFLINE (Unlimited time)
   └─ Rewatch videos (no WiFi needed)
   └─ Read PDFs offline
   └─ Listen to audio offline
   └─ Complete exercises

Result: 30 minutes at center = 2-3 hours of learning content!

System Capacity

Concurrent Users

  • At learning center: 200-400 students simultaneously
  • Coverage area: 150-240m linear × 100-160m wide

Daily Throughput

  • Students per shift: 100
  • Shifts per day: 5
  • Total students/day: 500+

Offline Learners

  • Unlimited (students with cached content in tents)

Deployment Checklist

Phase 1: Site Preparation

  • Select learning center location (central, open area)
  • Plan linear layout for daisy chain mesh
  • Mark AP locations (60-80m apart)
  • Identify solar panel mounting location

Phase 2: Solar Power Installation

  • Mount solar panel (south-facing, 15° tilt)
  • Install battery in weatherproof box
  • Connect MPPT charge controller
  • Wire DC distribution to components
  • Test power system (verify voltage, charging)

Phase 3: Network Setup

  • Install KOOMPI Mini at main hub
  • Connect main Deco AP #1 via Ethernet
  • Power on and configure SSID "SalaDigital"
  • Position AP #2 at 60-80m distance
  • Wait for mesh connection (auto-join)
  • Position AP #3 (if using) at 60-80m from AP #2
  • Verify mesh backhaul connections

Phase 4: Testing

  • Walk coverage area with mobile device
  • Test signal strength at 0m, 60m, 140m, 220m
  • Verify video streaming quality at each zone
  • Test mobile app content caching
  • Load test with 50-100 devices
  • Monitor battery discharge over 8 hours

Phase 5: Training

  • Train camp staff on system operation
  • Demonstrate mobile app to students
  • Explain cache-and-learn workflow
  • Provide troubleshooting guide

Troubleshooting

Power Issues

Battery not charging:

  • Check solar panel connections
  • Verify MPPT controller LED indicators
  • Check for shade on solar panel
  • Test panel voltage (should be 18-22V)

System powers off during day:

  • Battery capacity insufficient (check battery health)
  • Increase battery capacity (add second battery)
  • Reduce operating hours

Battery drains too fast:

  • Verify power consumption (use multimeter)
  • Check for additional loads
  • Ensure APs are in mesh mode (not router mode)

Network Issues

Mesh not connecting:

  • Ensure distance between nodes is <80m
  • Check line of sight between APs
  • Restart mesh nodes (power cycle)
  • Verify main AP is powered and connected

Weak signal at AP #3:

  • Reduce distance between AP #2 and AP #3
  • Check for obstacles (trees, buildings)
  • Consider Ethernet backhaul for AP #2 (if feasible)

Students can't connect:

  • Verify SSID broadcast is enabled
  • Check password is correct
  • Ensure client isolation is not blocking access
  • Restart KOOMPI Mini

Maintenance Schedule

Daily

  • Check battery voltage (should be >12.5V)
  • Verify all APs are online (LED indicators)
  • Monitor student usage

Weekly

  • Clean solar panel surface
  • Check all cable connections
  • Review system logs
  • Test mesh backhaul speed

Monthly

  • Inspect battery terminals (corrosion)
  • Check solar panel mounting (secure)
  • Update KOOMPI Mini content
  • Backup usage data to USB

Quarterly

  • Deep clean solar panel
  • Test battery capacity
  • Update firmware (KOOMPI + APs)
  • Replace worn cables/connectors

Technical Support

KOOMPI Support:

TP-Link Deco Support:

Solar System:

  • Check charge controller manual
  • Monitor battery voltage daily
  • Contact solar installer for issues

Document Version: 1.0
Last Updated: 2025-12-20
For: Refugee camp deployment teams