energy storage for telecom datacenter

An Expert of Energy Storage Solutions.

Energy storage for telecom IDC

With lead-carbon batteries

By Walter. Jin

[email protected]

+86-18917365151

Stored Energy Solutions for a Demanding World!

Cost analysis for IDC center Cost of IDC center

Duration Electricity/kw Depreciation/kw Capital cost Maintenance/kw Total cost

Cost $1,822 $978.99 $399.08 $196.38 $3,403.82

Proportion 53.75% 28.76% 11.72% 5.77% 100.00%

Annual cost of one IDC center in China

Among all the cost of IDC center, the initial investment is quite large at beginning, however it will

be depreciated annually till final 28.76% of total cost, take an example, the initial investment of

battery is about $290/kw, while its depreciation is $58 per year, which is only 1.7% of total cost


Item Unit price of electricity Power Usage Efficiency Time per year

Trend From $0.13 to $0.09 From 1.6 to 1.3 365day*24h=8760h

How to electrical cost for IDC center Cost of IDC center

Electricity structure of one IDC center

Note: the annual cost of electricity is $0.13 ×PUE1.6×8760h= $1,822 for ordinary IDC center

Apart from initial investment, the biggest cost of every IDC center would be the electricity, which

is about of at 53.75% of total cost. Currently, Narada has two methods to reduce it via: A. reduce

PUE to 1.6; B. reduce unit price of electricity to $0.09 by means of peak shaving and valley filling


Tariff in Beijing High peak (kw) Peak (kw) Shoulder (kw) Valley (kw)

July & August $0.218 $0.201 $0.125 $0.053

The rest months $0.201 $0.125 $0.053

Profit from price between peak and valley

In order to encourage power consumption in balance, China has made a electricity policy of peak

and valley with the maximum price difference of 3.5 times, which means the total electrical cost

can be reduced by less consumption in peak period while more consumption in valley period

Profit from grid power Why Energy storage?

Source: data of electricity tariff from the website www.95598.cn of China State Grid in 2016


Power demand with storage

Power demand without storage

Adjustment for grid power Why Energy storage? P

ow

er

load

in

dex

6AM 6PM 12:00 00:00

About 6 hours of peak time per day!

Charge from grid

Discharge to grid

Charge from grid

0

It is profitable to choose some special

regions for project location where the price

difference of electricity is quite big during a

whole day. The difference between day and

night is: USD0.201 - 0.053 = USD 0.148,

which will bring USD 324.12 per kilowatt

(USD0.148 * 6h*365= USD324.12), so the

profit of 1MW datacenter will annually

generate about USD 0.324 Million income,

which means the cost of electricity can be

reduced about 15%!!!

To take profit by energy storage


Time zone

T1 T2 T3 T2 T3

USD/KW

USD0.053/KW

Hour

USD0.201/KW USD0.201/KW

USD0.125/KW USD0.125/KW

Buy Sell Sell Stop Stop

New IDC operation mechanism ESS Business Model

Mechanism of peak shaving >

During the whole process, battery

will not change power structure

When grid outage happens, all

loads will be supplied by battery

Diesel generator will start and

replace battery within 15 minutes

The batteries will ensure backup

power for 15 minutes in security


New IDC operation mechanism ESS Business Model

Time Grid A Battery B Load C

T1 Grid for load and charging

A=B+C

Charging B=A-C

C

T3 Total grid

A=C No charging

B=0 C

T2 Grid partly for loads A=C-B

Discharging of partly batteries B=A-C

C

C C

B B

G

A

- - +

+

Peak shaving for IDC power backup


Modification on existing IDC design Feasibility of storage

Main points of modification >

No change on structural design

of existing configuration of IDC

To replace lead-acid batteries into

lead-carbon ones for better quality

15 minutes of capacity for backup

and other 15 minutes for storage

With modular UPS units to offer

power by both grid and battery

It is ensured that backup by full

capacity for 15m after 8h storage

The design life for switching or UPS system

% L

oad

Storage capacity

Actual capacity


Discharge ability of storage battery Feasibility of storage

Program testing with 2V300Ah lead-carbon battery

Discharging time (minutes)

En

d v

olt

ag

e (

V)

Cu

rren

t (A) / ca

pacity

(Ah

)

Cell1 Cell2 Cell3

Current Capacity


Power supply by hybrid energy Feasibility of storage

The UPS of module type can be used for such

application, whose modules can be partially

worked with both grid and batteries, in order

to realize the power supply by hybrid energy

Advantage >

No change to line of hardware,

only change in logical control.

Disadvantage >

The power proportion is related

with number of modules of UPS

Hybrid power supply by grid and battery

Grid input

Battery input

Power path of module1

Power path of module5

LB

S

LB

S

LB

S

LB

S

PFC

PFC

PFC

PFC

PFC

INV

INV

INV

INV

INV

output


Power supply by battery for UPS Feasibility of storage

Power supply from grid and battery Power supply only from battery

Module1

Module2

Module3

Module4

Module5

Module1

Module2

Module3

Module4

Module5

Batteries Batteries

Grid Grid

UPS UPS

Output Output

Power source for all UPS modules comes from

batteries connected with the entire UPS unit

Power source for UPS modules 1~4 comes from

the grid and module 5 comes from all batteries


Innovative cooperation mode Project execution

Analysis of advantages >

Storage operator will be benefit from

profit and offer reliable backup time

IDC operator will be free from issue

of batteries quality and investment

IDC operator could rent electricity with less

investment and risks while storage operator

will provide batteries and maintenance, with

profit from power difference by peak shaving


Items IDC operator Storage operator

Investment UPS power, switch mode of power supply,

high voltage DC system and meters…. Batteries of backup power and

storage for both 15 minutes

Engineering All equipment installation including batteries as well as related materials

To deliver products and provide service for installation monitoring

Maintenance For equipment of power supply and centralized power and environment

monitoring system

To guarantee battery performance and quality as well as fault repair

Responsibility In charge of access of communication

interface and protocol, logical instruction to execute storage system….etc.

To make sure normal operation of battery, and 15m backup at anytime

Cooperation of two operators Project execution


January 12th 2017, Narada and Hangzhou Zhong

heng Electric Co., Ltd successfully won the tender of

“Energy storage and equipment procurement for

Data Center project of China Mobile”,which marks

that our company's energy storage business model

successfully opened the data center industry

market, as well as opened up a potential and more

robust application market. The project is

implemented in the form of "investment plus

operation", with a total capacity of 121.7 MWh.

Project for datacenter of China Mobile

Example of storage application Project execution

Thanks!