Discover Manual

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9.5 Reverse Polarity
Was the battery exposed to reverse polarity? If the battery cables were attached in reverse polarity the BMS will likely be
damaged beyond repair and will require replacement. Contact your dealer and have a qualied and authorized person
replace the BMS.
9.6 Symptom Analysis
Low or zero volts across
the terminals when battery
is set to ON.
The battery may be fully discharged Charge the battery
The battery’s internal fuse may have blown (open) Have the battery’s internal fuse replaced
The BMS may have engaged low voltage protection 1) Remove all loads from the battery
2) Set the battery to ON (toggle OFF and then ON)
3) Charge the battery
Voltage drops abruptly
while in use after
appearing to be constant
The battery may be fully discharged Charge the battery
The BMS may have engaged over current protection** Reduce the current draw on the battery
The BMS may have engaged over temperature
protection
Reduce the internal battery temperature by reducing
ambient temperature and / or reduce high current draw
on the battery
The BMS may have engaged under temperature
protection
Increase the internal battery temperature be increasing
the ambient temperature
The battery’s internal fuse may have blown (open) 1) Have the battery’s internal fuse replaced
2) Reduce load in-rush currents
3) Increase battery bank Ah capacity (parallel operation)
Charge current suddenly
drops to zero while
connected to a charger
The charge current may be too high, and the BMS has
engage over current protection
Reduce the charge current
The temperature of the battery cells is below 0°C (32°F),
and the BMS has engaged low temperature protection
Increase the internal battery temperature be increasing
the ambient temperature
The battery cell temperature may be over the
operating limit, and the BMS has engaged high battery
temperature protection
Reduce the internal battery temperature by reducing
ambient temperature and / or reduce high current draw
on the battery
The battery cells may be out of balance Apply a oat charge for 48 hours to balance the battery
cells
The battery does not
deliver the expected Ah
(capacity)
The battery cells may be out of balance Apply a oat charge for 48 hours to balance the battery cells
The battery may have reached the end of its useful
service life
Replace the battery
The battery may have over heated due to high ambient
temperatures and / or high current
Reduce the internal battery temperature by reducing
ambient temperature and / or reduce high current draw
on the battery
** Over current protection for extremely high current inrush (inverter startup, motor startup) can be engage in under 1ms. A
digital ammeter will likely not be fast enough to measure this type of current.
10. Recycling and Disposal
Batteries must not be mixed with domestic or industrial waste. Discover AES batteries are recyclable and must be processed
through a recognized recycling agency or dealer. Please contact Discover or your servicing dealer for details.