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If there is none available, use O-27 to convert polarity Standard Lithium First connect the O-27 to your solar panel’s SAE connector and then connect it to the OptiMate Solar DUO controller’s input connector.
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With OptiMate Solar panel, connect easily to the new DUO Controller: New DUO controller Old controller You are now ready to charge! Other Solar panels, connect with 2-pin SAE connector: Ready to charge! adapt SAE connector polarity If your solar panel has another type of connector – you may need an adapter or the cable has to be modified.