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Are you running the 230V a.c. 20 metres or the 12V d.c.? The laptop type supplies are typically 100-240V a.c. input so should still be producing 12V out even at the end of 20m of the a.c. run. Measure the output on no load and see what volts you get and then fully loaded. The supply may not be regulating very well so you may need a better one. A booster is a good option but you should still ensure your load is not drawing too much current otherwise you may just need a higher Watts/Amps supply and one that is better regulated.
There are many voltage boost options available at Amazon, eBay and even Jaycar but first ensure Amp capacity is available.
If you are running the d.c. 20m then get heavier gauge cable to reduce the volts drop. A better regulated supply is still preferred.
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