V0
Fig 3 Battery placement
3.3 Supporting parallel connection
GC51V100Ah allows up to 4 batteries to be used in parallel. Before parallel connection of batteries, use
a multimeter to test the voltage at both ends of the positive and negative electrodes of the batteries, and ensure
that the voltage between batteries does not exceed 2V. If the voltage between batteries exceeds 2V, each
battery shall be fully charged separately and then used in parallel.
1. Precautions for parallel connection
A. The parallel battery pack must have the parallel function; The parallel connected battery packs must
be products of the same model and batch
B. Ensure the length of all parallel wires is consistent;
C. We suggest using 0.5C for charging, that is, charging current=battery rated capacity * 0.5C
D. When the battery packs are used in parallel, the open circuit voltage of each group of batteries must
be highly consistent. It is recommended that the voltage difference between battery packs be:
Voltage difference ＜ 2000mV (@ 0%~95% SOC)
When the voltage difference is less than 1500mV (@ 96%~100% SOC), the battery pack will be charged
and discharged as a whole after being connected in parallel. If one of the batteries needs to be replaced, it is
recommended that all battery packs be replaced at the same time
Two 51.2V batteries in parallel
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