Discover SENTRY

SAFETY IS
JOB ONE.
DISCOVER AES IS CLEANER + SAFER
WITH STRINGENT UL1973 AND UN38.3
STANDARDS.
Discover AES LiFePO
4
batteries with SENTRY are cleaner and
safer than lead acid batteries. Stable and high-performing
LiFePO4 cells managed by your proprietary, 3rd generation
BMS design have been tested and certified to stringent
UL1973 and UN38.3 standards for safety and transport..
Off-grid solar installers have been using lead acid batteries
a long time and regardless of the benefits Lithium batteries
offer, there is familiarity and comfort in those traditional
lead batteries. To be successful replacing lead acid for
residential energy storage applications we knew we would
need to convince those installers that Discover AES LiFePO
4
batteries not only outperformed lead, but that they are
safer too.
The first and most important consideration in designing a
safe Lithium Ion battery is the selection of cell chemistry.
When Discover decided to develop an advanced battery for
residential solar applications we considered each lithium
chemistry before finally committing to LiFePO
4
.
Lithium Cobalt (LCO) is one of these advanced battery types
and is commonly used in consumer electronics because of
its high, power density. For residential solar applications
however, LCO has a relatively short lifespan, limited load
capabilities (specific power) and low thermal stability which
make it susceptible to thermal runaway.
With application knowledge gained from years of observing
Discover’s own lead acid batteries in the field, we chose
to use Lithium Iron Phosphate (or LFP or LiFePO
4
) cells as
they are ideally suited to the demands of off-grid homes.
LiFePO
4
works for stationary / solar applications because it:
is very thermally stable with no risk of thermal runaway;
offers the longest cycle life;
can be recharged at 1C rate;
and can handle heavy loading and rapid discharge rates.
The second critical component in the design of safe, high-
performance, Lithium batteries is the Battery Management
System (BMS). Unlike lead acid batteries, Discover AES
LiFePO4 batteries are managed by a sophisticated BMS
which continuously monitors and controls all electrical
inputs, outputs and cell status.
Highly engineered power electronics controlled by proprietary
firmware and device drivers protect the cells and assembly,
and ensure our batteries provide the performance and
safety your customers demand. Compared to lead acid
batteries, there is no risk of arcing from shorted terminals
because the BMS simply disengages a relay and interrupts
power. There is no exposure to corrosive electrolyte and no
off-gassing from overcharging. Even the highest quality,
sealed batteries can’t make that claim.
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