▲
CAUTION!
NOT ALL CHARGERS ARE CAPABLE OF CHARGING
LITHIUM BATTERIES!
During system design CONFIRM that your chosen charger
is not capable of transient spikes that exceed the published
MAXIMUM TERMINAL RATINGS of the battery
Spikes are fast, short duration electrical transients in voltage (voltage spikes), current (current spikes), or transferred energy
(energy spikes) in an electrical circuit. Voltage spikes usually happen when the AC/DC adaptor is plugged in, or charge current
is cut off quickly. Multi voltage chargers are made using transformers that may be capable of producing spikes that exceed the
maximum ratings of the Discover AES. You must confirm with the charger supplier that the chargers being supplied:
• meet Discover’s recommended charge curve, and
• are not capable of exceeding Discover’s maximum terminal voltages.
6.3 Charge Curve
Charge sequence
1. Use Qualification phase for auto-on feature (optional).
2. Charge at constant current to 3.4 Vdc per cell module (Bulk).
3. Maintain constant voltage 3.4 Vdc per cell module (Absorption).
4. Terminate when charge current drops below 2A.
▲
CAUTION!
Do not charge battery higher than 3.4 Vdc per cell module.
▲
NOTE!
Recommended charge current is 0.5C.
Model
V
Q
I
Q
V
BATT
15-24-1000
Min 20V / Max 24V (I
Q
< 1A)
< 1 A
≥ 20 V
15-36-1000
Min 20V / Max 36V (I
Q
< 1A)
≥ 30 V
Model
Cell Modules
in Series
V
BATT
I1
U1
Termination
Charge Current
15-24-1000
8S
≥ 20 V
40 A maximum
27.2 V
I2 ≤ 2 A
15-36-1000
12S
≥ 30 V
25 A maximum
40.8 V
6.4 Discharging
• Turn on battery
• Turn on load
▲
NOTE!
Do not discharge battery below recommended minimum
operating voltages.
▲
NOTE!
Do not discharge battery at rates greater than
recommended operating currents.
6.5 Storage
Systems should be stored out of direct sunlight under the following temperature conditions:
Absorption
Charge Current % of Bulk Charge C-Rate [%]
Voltage - U
Current - I
Bulk
Qualification
Battery Voltage [V]
2.8
20%
V
BATT
V
Q
I
Q
40%
60%
80%
100%
3
3.2
3.4
3.6
U1
I2
I1
V
Q
=12V I
Q
=1Amax
6
