The German commercial energy storage system
manufacturer Tesvolt (Wittenberg) has been awarded a contract to supply a
decentralized off-grid storage system, which acts as a mini-grid during
power cuts.
The company is set to deliver a lithium
storage system with a total capacity of 2.68 megawatt-hours (MWh) which
will provide water pumps in an agricultural project in Rwanda’s Eastern
Province with emergency power, Tesvolt announces.
A 3.3 MW solar photovoltaic (PV) power plant and the
storage system are being engineered and constructed by the
international system integrator IdeemaSun energy.
“In Rwanda, the power supply fails three or four
times a day for between 5 and 45 minutes. For this reason, an important
criterion in the call for tender was that the storage system is able to
absorb electricity from the PV power plant and release it again as
quickly as possible,” explains Simon Schandert, Director of Engineering
at Tesvolt.
“Only very powerful off-grid storage systems can
supply the necessary emergency power several times per
day, and there
are only a few storage systems on the market which meet these
requirements. A further selection criterion was the necessity for the
entire storage solution to be as reasonably priced as possible.”
Tesvolt has developed storage systems which use
prismatic battery cells, which enable high charging speeds through their
particular design and chemical composition. The intelligent control
system ensures that each individual cell is charged and discharged at
the optimal rate for a particularly long service life, the company
emphasizes.
134 lithium storage systems for water pumps
Tesvolt is set to supply a total of 134 fully
assembled lithium storage systems for the 44 water pumps. The storage
system will supply the irrigation project with clean and safe emergency
power, also boosting yields in local agriculture.
This should improve the living conditions of around
2,000 farmers, who currently live in extreme poverty. In total,
402 Sunny Island charge controllers from SMA are to be deployed for the
project. In the event of power cuts, the storage system will act as a
mini-grid, enabling the PV power plant to continue running.
Every cell in the storage system is monitored
The Tesvolt battery management system monitors each
individual cell when the system is in operation so that any damaged
cells are identified before they completely fail.
If a cell is defective, the installer only needs to
exchange that single cell, unlike in conventional storage systems where
the entire battery block has to be replaced, Tesvolt notes.
Tesvolt will be introducing its storage systems at Intersolar Europe in Munich from June 22–24, 2016; Booth 550 in hall B1
source: http://www.solarserver.com
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