I asked them some questions before posting here, they told me you can pull current from charging port but it can only handle 20A. I cannot find the user manual to clarify if the charging port can also be used as discharging port.
Specifications
1.Chemistry: Lithium Iron Phosphate (LiFePO4)
2.Rated voltage: 12.8V (Working voltage per cell: 3.2V)
3.Charge voltage: 14.4 - 14.6V
4.Cut-off voltage: 10V
5.Max continuous charge current: 1C
6.Max continuous discharge current: 1C
7.Peak discharge current: 2C
8.Operating temperatures: Standard 0°C~45°C(32°F~113°F), Discharge -20°C~65°C(-4°F~149°F),Storage -20°C~45°C(-4°F~113°F)
Features:
1. Charging connection port: Rated maximum current and voltage for charging:59A/14.6V;The maximum discharge current is 20A.
2. Power switch: Power switch controls the power of USB and voltage display.
3. BMS protection board: BMS provides battery charging and discharging and short circuit protection.
4. Extremely Low self-discharge: <3% for LIFEPO4 versus >20% for SLA Battery. Long Service Life: Its cycle can reach as long as 3000-5000 times which is 7-10 times of SLA (the SLA battery is 300-500 times only)
5. GREEN ENERGY BATTERIES: Made from 100% safe, nontoxic, renewable energy.Maintenance free.