Question about Superex #59-204 400W DC Power Inverter

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Superex 59-158 User's Manual

I bought this Power inverter from an auction, thinking that it will be a useful power backup when power goes down due to hurricane. However, I got stuck with not knowing how to charge it as there was no charging cable or User's Manual included. Does anybody know where I can get a copy of the User's Manual ? I believe this is already an old model, so anything in the 59-xxx series might help.

Thank you.

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