[page 28] | gpelectric.com
.LiFeP04 is the most commonly used Li-ion battery chemistry. The factory default 'charged parameters' are in general
also applicable to LiFeP04 batteries.
Some battery chargers stop charging when the current drops below a set threshold. The tail current must be set
higher than this threshold.
The charge eciency of Li-ion batteries is much higher than of lead acid batteries: We recommend to set the charge
eciency at 99%.
When subjected to high discharge rates, LiFeP04 batteries perform much better than lead-acid batteries. Unless
the battery supplier advises otherwise, we recommend setting Peukert's exponent at 1.05.
IMPORTANT WARNING
Li-ion batteries are expensive and can be irreparably damaged due to over discharge or over charge.
Damage due to over discharge can occur if small loads (such as: alarm systems, relays, standby current
of certain loads, back current drain of battery chargers or charge regulators) slowly discharge the battery
when the system is not in use.
In case of any doubt about possible residual current draw, isolate the battery by opening the battery
switch, pulling the battery fuse(s) or disconnecting the battery positive when the system is not in use.
A residual discharge current is especially dangerous if the system has been discharged completely and
a low cell voltage shut down has occurred. After shutdown due to low cell voltage, a capacity reserve
of approximately 1Ah per 100Ah battery capacity is left in a Li-ion battery. The battery will be damaged
if the remaining capacity reserve is drawn from the battery. A residual current of 4mA for example may
damage a 100Ah battery if the system is left in discharged state during more than 10 days (4mAx24h x
10 days = 0,96Ah).
The GP-BMK-50 draws 4mA from a 12V battery. The positive supply must therefore be interrupted
If a system with Li-ion batteries is left unattended during a period long enough for the current
draw by the GP-BMK-50 to completely discharge the battery.
7. LITHIUM IRON
PHOSPHATE BATTERIES (LIFEPO4)
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