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Lithium battery information

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My 4.8kva (sun pays) lithium battery can only last me 7hrs. Purchased this in October 2021. i want to add another but was told that the battery has been discontinued and replaced with a touch screen(upgraded battery) but the cells are identical. I was advised to run both using a DC busbar and ensure my cables are the same length. Any recommendations will be appreciated.

12 x Canadian 335w

1 x Growatt Low voltage 5kva

1 x Sunpays 48v LI battery.

Thanks in advance

 

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