Li Time 24100 100Ah LiFePO4 Lithium Battery User Manual
- June 1, 2024
- Li Time
Table of Contents
RECOMMENDED CABLE SIZING
Battery cables should be properly sized to handle the expected load.
Refer to the table below for amperage ratings for different sizes of copper
cables.
| PVC COPPER CABLE SIZE (AWG/mm?) | AMPACITY (A) |
|---|---|
| 14 (2.08) | 20 |
| 12(3.31) | 25 |
| 10 (5.25) | 35 |
| 8(8.36) | 50 |
| 6(13.3) | 65 |
| 4(21.1) | 85 |
| 2(33.6) | 115 |
| 1(42.4) | 130 |
| 1/0(53.5) | 150 |
| 2/0(67.4) | 175 |
| 4/0(107) | 230 |
The above values are from NEC Table 310.15(B)16 for copper cables rated at 167°F (75°C) operating at an ambient temperature not exceeding 86°F (30°C). Cables longer than 6 feet (1829 mm) or ambient temperature higher than 86°F (30°C) may require heavier gauges to avoid excessive voltage drops with undersized ones.
SERIES / PARALLEL CONNECTION
THE PREMISE OF CONNECTION
To connect in series or /and parallel, batteries should meet the below
conditions:
a.identical batteries with the same battery capacity (Ah) and BMS (A);
b. from the same brand (as lithium battery from different brands has their
special BMS);
c. purchased in near time (within one month).
LIMITATION FOR SERIES/PARALLEL CONNECTION
Support connecting up to 8 identical batteries for up to:
2in series as 48V (51.2V) battery system/
4in parallel as 400Ah battery system.
Series Connection
48V(51.2V) 100Ah| Parallel Connection
24V(25.6V) 400Ah
---|---
|
HOW TO CONNECT BATTERIES
Step l Wear Insulating Gloves
Wear insulating gloves for protection before connecting. Please pay attention
to operation safety in the process of connection.
Step2 Voltage Balancing Before Connection
Below two steps are necessary to reduce the voltage difference between
batteries and let the battery system perform the best of it in series or/ and
in parallel.
Step 1
Fully charge the batteries separately. \(voltage at rest: =26.66V)
Step 2
Connect all of the batteries in parallel, and leave them together for
12~24hrs.
Step 3
They’ re now ready for the connection.
Step 3 Battery-to-Battery Connection
O #1 Connect Batteries in Series 
After series connection, the voltage
of the battery system will be doubled according to the number of batteries you
connect.
E.g. If two 24V 100Ah batteries are connected in series, the battery system
will be 48V (51.2V) 100Ah.
O #2 Connect Batteries in Parallel
Refer to Page 11 for total input & output connection 
After parallel connection, the capacity of the battery system will
be doubled accord- ing to the number of batteries you connect.
E.g. If two 24V 100Ah batteries are connected in parallel, the battery system
will be 24V (25.6V) 200Ah
O #3 Connect Batteries Both in Series & Parallel 1
Connect in parallel first, then series.
Step 1
Connect the batteries in parallel.
Step 2
Connect the paralleled battery systemsin series.
Step 4 Total Input & Output Connection
Use two copper bars (instead of battery terminals) to connect all the positive
and negative output/input cables, ensuring that the input & output currents of
each battery are balanced. (Not required when connecting batteries only in
series.)
Itis not recommended to use one terminal as the total positive or negative
output/input of the battery system as the connected terminals may heat up or
even melt if the total output/input current of the battery system is too high.
4P2S
| Battery System | 48V (51.2V) 400Ah |
|---|---|
| Energy | 20,480Wh |
| Max. Continuous Charge / Discharge Current | 400A |
| Max. Continuous Load Power | 20,480W |
- As of 1 /3 /5 /7 isconnected in series with of 2 /4 / 6 / 8, please do not connect of 1 /3/5/7 with of load or of 2 /4 /6/ 8 with @ of load, otherwise the battery system will fail to connect in series.
- Please do not connect in reverse order, which may affect the use of the batteries.
Step 5 Rebalancing Every 6 Months
It is recommended to rebalance the battery voltage every six months
following Step 2 on Page 9 if you’ re connecting multiple batteries as a
battery system, as there might be voltage differences after six months of the
battery system running.
Wiring Diagrams
2P2S
| Battery System | 48V (51.2V) 200Ah |
|---|---|
| Energy | 10,240Wh |
| Max. Continuous Charge / Discharge Current | 200A |
| Max. Continuous Load Power | 10,240W |
3P2s
| Battery System | 48V (51.2V) 300Ah |
|---|---|
| Energy | 15,360Wh |
| Max. Continuous Charge / Discharge Current | 300A |
| Max. Continuous Load Power | 15,360W |
WHAT TO DO WHEN THE BATTERY STOPS WORKING?
When the battery 
It has 85% chances that BMS has shut it off for protection, and you could try one of below ways to activate the battery.
GENERAL STEPS
If the BMS has cut off the battery for protection, follow the below steps to
activate it.
Step 1
Cut off all the connections from the battery
Step 2
Leave the battery aside for 30mins
Then the battery will automatically recover itself to normal voltage (>20V)
and can be used after fully charged.
If the battery is unable to recover itself after the above steps,
please try activating by ONE OF BELOW TWO METHODS.
After activated (voltage > 20V) and fully charged by the normal charging
method, it can be used normally.
Method 1
Use a charger with a 0V charging function 1 to fully charge the battery. 
- The charger can charge the battery starting from 0V.
Method 2
Connect a controller that supports 24V LiFePO4 battery charging to charge the
battery for 3~10s in sunny daytime. 
Originate from Ampere Time
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