THE PREMISE OF CONNECTION
To connect in series or /and parallel, batteries should meet the below conditions:
- identical batteries with the same battery capacity (Ah) and BMS (A);
- from the same brand (as lithium battery from different brands has their special BMS);
- purchased in near time (within one month).
LIMITATION FOR SERIES/PARALLEL CONNECTION
Support connecting up to 16 identical batteries for up to:
4 in series as 48V (51.2V) battery system / 4 in parallel as 400Ah battery system.
HOW TO CONNECT BATTERIES
Step 1 Wear insulating Gloves
Wear insulating gloves for protection before connecting. Please pay attention to operation safety in the process of connection.
Step 2 Voltage Balancing Before Connection
Below 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.
1. Pull out insulating plugs.
(voltage at rest: >13.33V)
4. Connect all of the batteries in parallel, and leave them together for 12~24hrs.
#5.1 Connect Batteries in Series
#5.2 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.) lt is not recommended to use one terminal as the total positive or negative output/in.put 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.
Precautions:
① All wire diameters and lengths are consistent, Recommended wire diameter 6AWG .
② All wire diameters and lengths are consistent,Recommended wire diameter 6AWG
③ All wire diameters and lengths are consistent,Recommended wire diameter 6AWG
④ Select the recommended wire diameter based on the actual load in the following text.Recommended wire diameter 0AWG .
6. Rebalancing Every 6 Months
It is recommended to rebalance the battery voltage every six months following Step 2 . If you' re connecting multiple batteries as a battery system, as there might be voltage differences after six months of the battery system running.
Appendix
System parameters after series and parallel
|
Battery System: x P y S |
|
|
Nominal Voltage |
12.8 * y V |
|
Discharge Current |
100 * x A Max |
|
Continuous Load Power |
(12.8 * y) ( * 100 * x ) W Max |
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) |
|
8AWG 8.3mm² |
58 |
| 6AWG 16mm² | 128 |
| 4AWG 25mm² | 175 |
| 3AWG 35mm² | 245 |
| 2AWG 50mm² | 300 |
| 1AWG 70mm² | 360 |
| 0AWG 100mm² | 450 |
