Sentinel EMS™ Savings Calculator
Sentinel EMS™

Sentinel Savings Calculator

Upload the OpenSolar PDF to auto-populate, or enter figures manually. All fields can be adjusted at any time.

Auto-populate from OpenSolar report — optional, all fields editable manually

📄

Drop OpenSolar PDF here or click to browse

Key figures will be extracted automatically

Customer details

System specification

kWp
kWh
kW
kWh/yr
kWh/yr
£

Solar & battery figures — enter directly from OpenSolar report

£
kWh/yr
years
£
%

Customer tariff type

Standard tariff rates

p/kWh

Day / Night tariff rates

p/kWh
p/kWh

Smart / Flux tariff

Dynamic pricing is handled automatically by Sentinel's optimisation engine. No manual rates required.

Energy usage pattern

Energy price inflation assumption

Annual energy price inflation rate 7%
3% 15%
Scenarios:
Sentinel EMS Financial Impact Report
Prepared by HSEnergy Group Ltd
Prepared for:
Results +£0 with Sentinel 7% inflation assumed
Solar PV: —
Battery: —
Inverter: —
Annual generation: —
Annual consumption: —
System cost: —
£0Extra annual benefit
from Sentinel
0 yrsPayback without
Sentinel
0 yrsPayback with
Sentinel
0 yrsYears saved on
payback
0%Rate of return
with Sentinel
Solar + Battery onlyOpenSolar figures
Annual bill savings£0
SEG export income£0
Peak shaving—
Market trading revenue—
Total annual benefit£0
Payback period—
25-year cumulative return£0
Rate of return on investment0%
+ Sentinel EMS™Recommended
Annual bill savings£0
Optimised export income£0
Peak shaving£0
Market trading revenue (net)£0
Total annual benefit£0
Payback period—
25-year cumulative return£0
Rate of return on investment0%
ℹ 12 months free — all new Sentinel customers receive year 1 at no cost. From month 13, Sentinel is £199/year (or £19.99/month). Net figures above deduct the subscription cost from year 2 onwards. Even after subscription, Sentinel continues to significantly outperform solar + battery alone.

Cumulative returns — 25 year projection

Solar + Battery only
Solar + Battery + Sentinel

Estimated monthly savings comparison

Solar + Battery
+ Sentinel

Solar + Battery figures sourced directly from OpenSolar report. Sentinel uplift figures are estimates based on system size, battery capacity, usage pattern, tariff type, and Joulen residential scenario benchmarks (March 2026). Trading revenues are not guaranteed. Sentinel market revenues shown net of 20% Joulen trading fee. Sentinel subscription cost (£199/yr) deducted from year 2 onwards in Sentinel cumulative figures. Rate of return with Sentinel is calculated from 25-year cumulative return relative to system cost. Energy price inflation applied at 7% per annum to cumulative projections. This calculator is a sales support tool for HSEnergy surveyors and should not be presented to customers as a guaranteed financial forecast.