Hybrid energy storage (batteries + hydrogen) and combined heat and power solution, for large buildings willing to secure their energy supply from renewable energy all year-long

1. Smart Energy Hub
Local | Sustainable | Reliable

2. Introduction to Sylfen I Smart Building Energy Storage Solution I April 2018 2
Energy storage, the key to smart buildings
insulation
Low energy building
Local energy production
PV cells
Grid connection
Smart Energy Hub
Hybrid energy storage (batteries
+ hydrogen) and CHP solution

3. Introduction to Sylfen I Smart Building Energy Storage Solution I April 2018 3
Example with a near Zero Energy Building (nZEB)
6 000 m²
Office building
Electricity: 245 MWhelec/year
Pmax = 97 kW | Base~8 kW summer, ~15 kW winter
Heat: 90 MWhth/year
PV production: 240 MWhelec/year
Premium
Local production = 72% energy needs
Energy needs = 335 MWh
Local renewable production = 240 MWh

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What outcome for decentralized energy productions?
Electric grid feed-in
Difficult: subsidies are decreasingA
Direct self-consumption
Limited: about 50% (120 MWh in excess)B
Local valorisation
Challenging: grid feed-in deteriorate stabilityC
100% : smart management
0%

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Energy Storage = Reliability

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Problem with energy storage today
Not one “best” technology

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Hybrid energy storage

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Today, H2 is 10
times cheaper than
the best Li-ion
projections !
Regarding costs : advantage hydrogen
Cost of energy
storage
(€/kWh)
Li-ion batteries 2018 350
Li-ion batteries in 2030
(best projection)
150
Hydrogen TODAY 15

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Li-ion batteries & Hydrogen : 2 complementary technologies
™Smart
Energy HubLi-ion Hydrogen
Power
Speed of
inversion
Capacity storage
Potential for heat
valorization
-
Efficiency cycle
Gas CHP -

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rSOC technology: the bridge between electricity and hydrogen
Oxygen
(air)H2
generation
Water electrolysis
Water
Electricity
H2 Fuel Cell
rSOC (reversible Solid Oxide Cell) = SOEC (Solid Oxide Electrolyser Cell) + SOFC (Solid Oxide Fuel Cell)
I
II
Biogas or
natural gas
Fuel Cell
III
I II III

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rSOC working principle
rSOC = reversible Solid Oxide Cell
SOEC = Solid Oxide Electrolyser Cell SOFC = Solid Oxide Fuel Cell
100% reversible

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rSOC benefits
No precious metals
Highly recyclable = circular economy
Cheap
Only 1 better system to replace 3 poorer* ones
Cheaper
As a gas, H2 can be stored in empty containers : 15€/kWh
Could be lower by using existing gas infrastructure
How much cheap
*rSOC has proven to be more efficient as: electrolyzer, hydrogen fuel cell, and methane fuel cell

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R&D since 2005
40 M€ invested
22 patents granted
has a worldwide exclusive licence
rSOC : a protected innovation

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Smart Energy Hub
A tailor-made solution for smart buildings

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Smart Energy Hub, by Sylfen
Modular manufacturing
Dimensioned and assembled according to
your specificities
No additional engineering required on-site
Hybrid energy storage (batteries + hydrogen)
and CHP* solution
*CHP = Combined Heat & Power

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Smart Energy Hub’s specifications
rSOC energy processor
Li-ion batteries
To produce hydrogen by electrolysis of water, and restore
electricity and heat in combined heat and power
For highly reactive responses
Software suite
To optimize the supply of energy from
local sources and grids
Hydrogen storage
To store MWh of energy
*Up to 6 modules can be combined
50 to 500 kWh
Electrolysis : 40 kW
Fuel Cell : 5 kWe + 4 kWth
10 to 250 kg of H2
1kg H2 = 33 kWh
7 kg H2/m²
1 module*

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Benefits of hybrid energy storage
Hybrid energy storage
solutions only need 0,4
MWh of Li-ion batteries
(vs. 48 MWh for Li-ion only)
Batteries respond to short-term electricity
demand (few hours)
Large quantities of energy is stored in H2 to
constitute stocks
When there is insufficiant PV-power
generation H2 stocks provide back large
quantities of energy

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6 000 m²
Office building
Electricity: 245 MWhelec/year
Heat: 90 MWhth/year
PV : 240 MWhelec/year
Premium
Li-ion : 400 kWh | 3 rSOC modules | 80 kg H2
50%
Reduction in
energy billsSmart Energy Hub
50%
Reduction in
CO2 emissions

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The time is now

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2016 2017 2018 2019 2020
Seed Development Growth
Fully integrated demonstrator
10 systems in real-field
Industrial design and commercial validation
Shipment of commercial products
Development plan
2021 2022
TRL 5-6
TRL 7-8
TRL 9

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Partners
Local collectivities Industries
Awards
They trust us

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organisation & operations
Marc Potron - 58
COO
BU head and in charge of stringent product
developments in defense and aerospace
industries
exploration & implementation
Caroline Rozain - 29
CSO
PhD in electrochemistry :
batteries, fuel cells & electrolysis,
energy management
vision & management
Nicolas Bardi - 44
CEO
Program & team management (>100
p) in fields of energy and hydrogen
François-Eudes Ruchon - 33
CMO
network & partnerships
International marketing and
innovation experiences in high-tech
and specialty productsn
Team Sylfen

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Looking for…
Partners worldwide:
To manufacture locally some of the sub-
systems of the Smart Energy Hub
To adapt, validate and market the Smart
Energy Hub and its associated services for
each local needs
To invest and share the future of Sylfen as
key solution provider for local and clean
energy supply
CONTACT
François-Eudes RUCHON
fe.ruchon@sylfen.com
+33 688 049 613
To demonstrate the smart building’s
business model
To validate the industrial design, premises
to mass production
To further develop key functionalities
specific to your application
Innovative building’s projects:

24. www.sylfen.com
contact@sylfen.com

25. Introduction to Sylfen I Smart Building Energy Storage Solution I April 2018 25
Hydrogen safety
Natural gas
Methane
Butane Propane Hydrogen
Calorific power (kWh/m3) 10 36 26 3
Ignition temperature (°C) 650 287 470 585
Explosion range (% in vol.)
4,4 – 15
4,4 – 16,5
1,8 – 8,4 1,7 – 10,9 4 - 77
Hydrogen gas has been used by industrial groups for decades. From a
chemical point of view, and like all energy gases (methane, propane,
etc.), hydrogen is a dangerous gas that should be used under safe
conditions to be below the threshold of risk.
Three types of hazards must be considered: for the user, for firefighters,
and for the environment. In the air, hydrogen will recombine naturally
with oxygen to form water. The dangers for users and firefighters are
related to fire and toxicity.
Hydrogen is not intrinsically toxic; however, if it accumulates, it can
cause suffocation. Its molecule, very small, gives it a very good diffusion
coefficient in the air (4 times higher than that of methane); in an
unconfined environment, hydrogen tends to rise and quickly become
diluted in the air. This property is an outdoor safety factor, but a
dangerous factor in confined spaces. One way to guard against this risk
is to ventilate the place of containment.
The dangers of fire and explosive potential are very much present for a
gas such as hydrogen, which can burn violently in the air to form water
(reaction residues are therefore not toxic either).
Hydrogen is intrinsically less dangerous than propane,
gas that we are used to everyday use.

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Hydrogen storage
For mobility purposes, heavy materials
impact the autonomy range, and volume is
limited. Innovative hydrogen storage must
be developed.
For stationary purposes, since there are no
or little weight and volume issues, it is
possible to use mature and economic
technologies : compressed gas is sufficient.