27
Smart GridTeam “Grino”

Solar on the roof. Safe voltage at home.

At noon, rooftop solar pushes street voltage past the legal limit — appliances break and inverters shut down. A small box at the inverter keeps the home safe and the panels working.

PRESENTER
Radik Grigoryan
TEAM
Mikayel Sarkisyan, Vitaliy Sukhoplechev, Zakhar Shcherbakov, Ara Galstyan
An ordinary Armenian street

Morning: voltage is normal

Model of a typical village street · legal limit 242 V
Armenia today

This is not a theory.

~59,000
solar plants on ENA’s grid
≈ 1 in 3
36%
customers get over‑voltage
industry expert estimate
150,000 customers got > 242 V in June — regulator’s data.
3,913
claims for appliances damaged by poor power quality in 2025
≈ 11 every day
a quarter of all complaints
Sources: ENA via Armenpress, 03.09.2026 · share of customers with over-voltage: industry expert estimate, 03.10.2026 · customers over 242 V in June: PSRC voltage data · PSRC quarterly complaint reports on ENA, 2025 (3,913 in 2025, a quarter of all complaints; per day = ÷ 365)
Why it is not fixed

Nobody controls home inverters.

Armenia
No such requirement in the grid rules yet
Chinamust be controllable, from 2026
✓
GermanyVDE-AR-N 4105: inverters must help control voltage
✓
Australiavoltage control mandatory
✓
Sources: NEA (China) 2025 No. 7 — new distributed solar "observable, measurable, adjustable, controllable" from 01.01.2026 · VDE-AR-N 4105 (Germany) · AS/NZS 4777.2:2020 (Australia)
SunGuard · one box per home

Helps from the very first home.

  1. Watches the voltage every second at your panel.
  2. Keeps your inverter running — switches on its own voltage control and eases power down instead of shutting down.
  3. On your phone — over home Wi-Fi: live voltage, alerts and a log for ENA.
No more emergency shutdowns · panels keep working
Line D: 255 V → inverter shuts down → 245 V → restarts → 255 V … (animation sped up)
home Wi-Fi → app
Model of a village block: one transformer, several lines · legal limit 242 V · inverter emergency shutdown above 253 V (EN 50549-1)
Where the problem lines are

2,614 lines go over the limit only at noon.

2,614
problem lines (noon only)
36.9 = problem lines per 10,000 customers
1,528 = problem lines in the marz
Noon-only over-voltage points to rooftop solar; lines that are also high at night need the transformer setting fixed first.
PSRC voltage data, June and December 2026/2025; customers: PSRC 2025
Business model

The economics of one box.

Unit economics
Parts≈ $30
Assembly, testing, certification assumption≈ $12
Price to the home, incl. VAT assumption$79
Margin after VAT≈ 36%
Market
Solar plants today ENA, Sept 2026~59,000
New in 2025 PSRC18,810
Year 1: 5% of today’s plants≈ 3,000 boxes ≈ $0.24 M
By year 3 (cumulative): 20% of today’s plants + 10% of new ones≈ 16,000 boxes ≈ $1.3 M
Whole Armenia: ≈ $4.7 M once + ≈ $1–1.5 M a year; next: Georgia, Uzbekistan.
Price, costs, adoption: assumptions. Plants and growth: ENA, PSRC.
Live demo
A real line from the regulator’s data
Gyumri · transformer 4661 · 334 homes
Rooftop solar on it: 300 kW (assumed)
A clear June day, noon
TodayCheapest fix(transformer tap)
Hours over the limit, per day70
Highest voltage249 V238 V
Solar this line can take205 kW354 kW
Our map finds the line; ENA adjusts the transformer: 0 hours over the limit and 1.7× more solar on the same wires.
Model of this line with average assumptions (length, wire, transformer); homes on the line: PSRC open data.
SunGuard box

Under $50 of parts.

≈ $30
11,000 AMD
parts for one box, shop prices in Yerevan
Wi-Fi version: home network → internet → our server
Sources: ChipDip.am retail prices of the parts, 03.10.2026 (≈ $30, 11,000 AMD)
Customers

Who buys it — and why.

1
Solar homes at the end of long lines

On the 2,614 problem lines.

Why: the inverter shuts down at noon, the panels stop producing.

Gets: panels that keep working, a voltage log for ENA claims.

Pays: $79 once.

2
Solar installers

~19,000 new plants in 2025.

Why: fewer “my panels switch off at noon” call-backs, a better offer.

Sells it with new plants.

3
Later: ENA

Why: a live map of problem lines without buying new meters.

Pays: for the data.

Alternatives today: the installer sets voltage control once (our first advice — where it is enough, no box is needed); the inverter’s app (sees one inverter, after it trips); a plain voltage relay (no control, no data).
Price $79: assumption · new plants: PSRC 2025 · problem lines: PSRC voltage data
What it took

24 hours, three pivots.

  • 7 ideas tested — and dropped, with reasonsbatteries, automatic line switching, phase balancer, selling noon surplus, dynamic tariffs, sensors in every substation, long-range radio — all listed on our research site
  • 820,000+ rows of the regulator’s data read → 2,614 problem lines found
  • Armenian law checked: radio bands, net metering, grid rules → the design changed twice (radio → Wi‑Fi)
  • A grid model and a calculator for 400 real lines, cross-checked to 0.1 V
  • Three pivots after mentor feedback: software for ENA → a box for problem streets → a box for every home, over Wi-Fi
  • The box designed with Yerevan prices: ≈ $30 of parts
Status

What works today.

Works today

  • Data analysis of the regulator’s files
  • Grid model
  • Calculator for 400 real lines
  • This 3D presentation

Designed, not built yet

  • The box (parts list, logic, Yerevan prices)
  • Inverter link (Modbus — brand by brand)

Safe by design

  • Control stays local; the cloud only reads
  • Owner’s consent for any data sharing
  • Every power limit has a revert timer
  • Libraries: three.js, pandapower, qrcode.js (open source)
Code and data: github.com/vitasha10/grino-smart-grid
Team “Grino” · #27

Help us turn the first street green.

  1. 50 solar homes on 3 problem lines for a pilot — Kars branch (Shirak)
  2. 2 solar installers to fit the boxes
  3. ENA meter data for those lines — to prove the effect
Full research
Scan me