Weight

1. Iridium Go Exec / Certus - 185 grams 18 watts
2. Raspberry Pi - 70 grams - 5 watts
3. High res Mokose web cam - 90 grams
4. Power/voltage adapter - 50 grams
5. Wires/cables - 50 grams
6. Total - ~ 600 grams - maybe 30 watts - 20% loss in range - way under 1.5 kg so 4 Kg battery can work