ISV Technology Committee · 25 June 2026 · wiki walkthrough · metering layers · emerging focus
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Orient volunteers on the Tech Comm knowledge base — main sections, how Tasks tie to GitHub Issues, and where Meter Interoperability work is heading (OBIS normalization, Street Pole EMS).
overview-solutions/isv-ai-wiki, meeting labels, status from labels + commentsHow the pieces fit together in field conversations (Sep 2025 deck + today’s call). Hub: OpenAMI page · EnAccess · OpenAMI.
| Component | Role | Notes |
|---|---|---|
| OpenEMS (Energy IoT) | EMS / edge orchestration | More urban — grid present (e.g. Aaron’s grid in Uganda). Stack can stop at the DCU when that is enough. |
| MeshEMS | NAN mesh | Lets DCUs form a mesh when pole-to-pole RF backhaul is needed. |
| OpenAMI / MQTT | Actionable telemetry · interop | Northbound contract — normalize southbound OEM/DLMS at gateway to registers operators can bill, vend, and disconnect on; ISV Meter Interoperability thread. |
| EnAccess MPM | Operator backend | MicroPowerManager as HES/billing layer — instead of OpenEMS backend in village deployments. |
| OpenAMI (geo + asset model) | Networking / topology semantics | Asset and connectivity layer above gateways — complements MQTT register payloads. |
| OpenADR | Price signals to devices | Pricing server for utility DR/tariffs — parallel track, not village prepaid priority. |
Working notes for MeshEMS and Street Pole EMS workshop hardware — multiple rails must be planned explicitly; 18650 cell voltage alone is not enough for every peripheral. Hub: MeshEMS board page. EMS board schematic (NESL): github.com/nesl-admin/nesl-meshems — see repo README. Street Pole firmware: ems-dev.
| Load | Rail | Notes |
|---|---|---|
| MeshEMS board | 5 V | Temperature reference needs a 5 V supply. PCB schematic on NESL nesl-meshems README. |
| 18650 battery holders | 3.3 V or 6.6 V → 5 V | Need a buck or boost converter depending on pack wiring (single cell ~3.3 V nominal vs two-series ~6.6 V). |
| SSRs | 5 V | Solid-state relays on the pole stack also require 5 V drive. |
| ESP32 dev kit (MeshEMS / Street Pole) | 5 V → 3.3 V | Typical dev boards accept 5 V on USB/VIN and step down to 3.3 V onboard for the MCU — no separate 3.3 V feed needed for the kit if a 5 V rail is available (check board spec). |
| CircuitSetup meter board | 3.3 V | Logic / stack interface runs at 3.3 V. |
| CircuitSetup base board | 3φ AC → 9 VDC → 3.3 V | Base draws from 3-phase AC, supplies ~9 VDC for measurement ICs, can regulate down to 3.3 V on the stack pin. |
Manages pole power from 240 VAC (3-phase): mini transformers, rectifier, surge diodes — produces a 5 V reference and three 9 V references. Would not recommend field use without an ETL or UL-certified board (safety, isolation, and utility voltage context).
Action for workshop BOM: specify buck/boost modules for 5 V where cell or stack voltage does not natively match; ESP32 dev kits can derive 3.3 V from 5 V onboard — keep CircuitSetup 3.3 V stack power separate from SSR / temp-reference 5 V budget.
Recipients and field partners for MeshEMS / Street Pole EMS boards — shipping, deployment, and installer training. Schematic: NESL nesl-meshems.
| Name | Contact | Role / notes | Status |
|---|---|---|---|
| Redwan Hussain | +1 646-361-6130 | — | On list |
| Sean White | — | Working with Arila Barnes (Energy IoT) on OpenEMS meters. Teaches NABCEP certified installer coursework — technician training for power / solar systems. | On list |
Related: Jude · 10× EMS board field deployment (#15) — no PII on meter read path.
Reported from the call — context for urban / grid-connected OpenEMS work and why local distribution telemetry matters more than export marketing alone.
| Observation | Detail |
|---|---|
| Outages | 2–4 hours every few days, observed ~2 miles from the airport — not only rural feeders. |
| T→D capacity | Not enough transmission-to-distribution cross-connect; distribution layer is overloaded. |
| Transformer life | Among the shortest transformer lifetimes reported — ~15% failure rate vs ~2% typical elsewhere. |
| Utility priorities | More emphasis on international electricity sales to neighboring countries than on local distribution servicing. |
| EV fast charging | 160 kW DC fast chargers — up to 8 cars on the same block; charging equipment fails when power surges hit the overloaded local network. |
Implication for ISV: leakage and load visibility at the distribution edge (OpenAMI / OpenEMS) is not abstract — overloaded T→D handoff and cluster EV load are breaking real assets. Compare IEEE 1547 / EPRI grid tooling vs village prepaid track.
| Layer | Example | ISV wiki thread |
|---|---|---|
| Grid interconnection | IEEE 1547 (EPRI wrote · IEEE std) | Standards · DER / microgrid tie-in |
| Prepaid / payment | STS token + key mgmt | Problems · L6 payment layer |
| Register semantics | OBIS · VMRS tiers | OBIS · VMRS |
| Northbound | MQTT / JSON at gateway | Meter Interoperability |
Add names, claims, and new follow-ups during or after the call.
Full board at the top of this page and in Knowledge Base · Tasks. Comment and update status on GitHub Issues ↗.