Suitable for all applications
TESVOLT storage systems are alternating current systems (AC) that are operated with "Sunny Island" charge controllers from SMA.
They can be powered by the low voltage grid regardless of generator output (PV, wind, hydropower, biomass, CHP) and
independently of the inverter manufacturer.
> How it works
- How much power, and with which speed, the storage system can store and supply depends on the number and output of the
charge controllers. At TESVOLT, a cluster consists of either one "Sunny Island" or three identical "Sunny Islands".
- One to four TESVOLT battery cabinets can be connected per cluster.
- Up to twelve clusters, i.e. 36 "Sunny Islands", can be installed with the Multicluster Box (MC Box) in the off-grid area.
Active battery management system
TESVOLT has developed an active bidirectional battery
management system (BMS). It ensures that the battery cells in the
storage system are always optimally charged and discharged. The
BMS monitors the temperature, voltage and charge state (SOH &
SOC) of each individual cell and controls them in a cell stack. Due to
this efficient energy distribution method, only 8 watts per hour are
consumed when in standby mode (battery cabinet incl. batteries
and BMS). There is no unnecessary heating of the storage system
that would mandate cooling. Bidirectional cell balancing
significantly extends the service life of the individual cells and sets
new standards in cell protection and safety through soCware and
hardware-based shutdown mechanisms (doubly redundant
Cell monitoring with TESVOLT BatMon software
Emergency and off-grid capabilities
TESVOLT storage systems can store up to 900 A from "Sunny Island" charge controllers - exactly the amperage that may be required
for a short time during emergency and off-grid modes.
> Stand-alone grid during blackouts
You can easily bridge any power outage with the new TESVOLT storage system. It automatically detects power outages, creates its
own stand-alone grid and con2nues to supply any connected loads. The switch-over time with the MC Box is 0 to 200 milliseconds,
and the switch-over time with up to three "Sunny Islands" is three to five seconds.
During a mains grid failure, the PV system does not switch off but continues to generate electricity for self-consumption. If needed,
an emergency backup generator can be integrated. This generator is automatically controlled by the storage system.
In case of a pure off-grid storage system, up to twelve clusters, a total of 36 "Sunny Islands", can be installed in the off-grid area. The
maximum power output ratio of the "Sunny Islands" to the PV inverter should be 1 to 2.5.
Ready for connection
TESVOLT battery cabinets are delivered turnkey. The lithium batteries are readily cabled in the cabinet and only the battery cables
and the communication cable for the "Sunny Island" systems need to be connected.
Service & maintenance worldwide
Keep tabs on the charge and health state of every individual battery
cell with our storage monitoring system. Monitoring and
maintenance can be carried out on-site and remotely using a tablet.
We also offer worldwide installation and service support via a video
The storage system efficiency is the overall efficiency of all
components of the SMA "Flexible Storage" systems and the
TESVOLT battery. This includes: charging and discharging efficiency
of the "Sunny Island” charge controllers, the efficiency of the
installation system including cables, BaJuse, energy meter,
contacts, the "Home Manager", and the efficiency of the battery
including the BMS. For TESVOLT, this results in a theoretical overall
system efficiency of about 90%. In the field, TESVOLT achieves a
max. storage system efficiency of over 80%, one of the highest
values in the market.
Warning: efficiency specifications are not standardised, and every
manufacturer has its own definition and calculation method. SMA,
for example, oCen uses the average efficiency, storage system
manufacturers usually specify the maximum efficiency - oCen only
that of the battery system itself instead of the whole system.
The Sunny Portal "Energy balance" display from SMA offers the
most meaningful overall system efficiency values: it is based on the
ratio of battery discharge to battery charge during the period under
System monitoring with SMA Sunny Portal
An example of SMA Sunny Portal's energy balance display as recorded
for a milking opera'on, commissioning July 2015
High charging power of up to 72 kVA (on-grid)
The nominal charging and discharging power of our storage systems is expandable up to 72 kVA (max. 132 kVA for three seconds) in
the low voltage grid depending on the number and output of the "Sunny Islands". In the off-grid area, up to 216 kVA of nominal
charging power is possible (max. 396 kVA for three seconds).
The storage capacity can be individually and precisely tailored for your application. Consult and plan according to actual
consumption (load curve) and generation!
Retrofitting at any time
Should your requirements change, you can expand the charging power of your storage system or add one or more storage cabinets.
Battery cells can be retrofitted in existing storage cabinets within one year.
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