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Strangely
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The pads are 30W each on full power so max 10A draw @ 12V.

Am I missing something? P=IV, so 30W = 2.5A * 12V, not 10A.

rj
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Four pads @30w = 120W or 10A @ 12V (One pad in each base and each backrest = four)

Guess the 9A comes from 13.something V...

Or am I wrong?

(PS if the pads are from China I've found that one ChinaW equals to approximately 0.15 DIN W when it comes to LEDs so...)

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Strangely
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Ah, yes, I'd missed that there are 4 pads. Doh!