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Batt volt drop

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Just got in new 20000w inverter. I have Two 24V Lifepo4 100ah batteries ran in series. Voltage of the two is 51 and change.

When I hookup the battery to the inverter,i use a light bulb to take the connection blast) the battery voltage drops down to 3 volts reading from the battery bank and inverter will not turn on. When disconnecting the batteries their voltage rises back up to 51. What could possibly be the issue here?

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