Off-grid degraded modes — power and connectivity (Demory farm)¶
Purpose¶
Extend two-site degraded-mode thinking for SITE_FARM (Demory) when power and WAN fail independently or together — without duplicating Manual fallback prose .
Doctrine package: Off-grid systems doctrine package — Demory.
Topology views : Off-grid farm execution topology — Demory (Mermaid) .
mermaid
stateDiagram-v2
[*] --> Nominal
Nominal --> N1 : WAN down only
Nominal --> Pstress : SOC / PV fault
N1 --> N2 : add power stress
Pstress --> N2 : add WAN loss
note right of N2 : N2 — paper rounds; battery-backed critical only
Failure classes (farm-specific)¶
| Class | Symptoms | Safe assumption | Operator response |
|---|---|---|---|
| P1 — Deep battery SOC / load shed | Inverter sheds non-critical ; some radios drop | Telemetry silence ≠ “ fine ” at the water . | Physical rounds ; disable non-critical RF if policy says so . |
| P2 — PV / charge fault | Reduced daily Wh budget | Starlink and high duty cameras may need to stay off until SOC recovers . | Runbook : Runbook — power loss at remote site . |
| N1 — WAN down , power OK | No cloud ; mesh / LAN may still work | Same as global LEO WAN impaired row on Manual fallback . |
Runbook — broker or backhaul down . |
| N2 — WAN + power stress (both ) | No egress ; some nodes dark | Only battery-backed critical paths matter . | Paper rounds ; genset policy if installed (TBD ) .** |
What must still work (policy)¶
- Welfare interlocks that do not require cloud .
- At least one local way to know tank / gate state (sight , float , local indicator ) .
- Offline records discipline for anything that feeds books .
What Starlink enables in recovery (only when powered)¶
- Coordinating with Claxton (
SITE_HOME) , vendors , or weather when you choose to burn Wh on CPE .
What Starlink must not gate¶
- Decision to drive for Tier-1 animal or water risk — policy beats dashboard .