Pump Pump Battery Draw/Cut Off.

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So first pose, please bear with me I am giving details but no links as I tried once already and got blocked/ marked as spam.

I have a solar powered pump system, all above ground/free standing.

12v system.

100W Solar panel, 30Amp charge controller and a bilge pump, 12V 500GPH, 2.2A. battery is DC house 12V 12AH Lith Ion.

System is electronically sound and works except for the fact that when running 100% from the battery the voltage shown on the charge controller as what I believe to be the battery output, slowly drop from 12.4 V down to about 9v over the course of about 10 minutes, then the pump trip/protects itself and turns off, the entire system goes into an off on/off state over and over again wit the shown voltage flickering hi/low values over and over until I turn it off.

My guess is the output on the battery is not "man enough" for the draw on the pump bit any help would be appreciated.
Thanks
Kyle.
 

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