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I have 3 of the following chips: 50w, 12v chips (https://www.amazon.com/gp/aw/d/B081QBC9MZ?ref=ppx_pt2_mob_b_prod_image) with the following specs: Features & details Current: 3750mA Voltage: DC12-14V Color temperature:3000-3500K Luminous flux:3500-4000LM Lifespan:50000h

I want to wire them to a sealed 12v battery onboard my kayak.

What would’ve the best way to wire them? Series, parallel...how many amp battery should I purchase?

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  • \$\begingroup\$ how would you connect one? \$\endgroup\$ – jsotola May 9 at 22:25
  • \$\begingroup\$ In series even 2 you will not have enough voltage, you have to connect them in parallel. I cannot size the battery, I do not know how long you want it to operate. You are using 11.25 amp hours, from that you can select your battery. Check the discharge rating of the battery, you cannot use 100% of the energy stored in it. \$\endgroup\$ – Gil May 14 at 2:13
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Those are meant to be driven by a constant current driver, so do not directly apply 12v to them. Instead select a 12v input constant current LED driver that can supply no more then 3.75A and has a voltage range that includes 12-14v. You will need a heatsink.

For longer lifespan and given that those look to be very cheap, I would stay around 2A or less.

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  • \$\begingroup\$ These will be housed in a full aluminum enclosing. Does such a constant driver exist? I’m trying to find one with those specs: input: dc12v, output: dc12v, amps: <3.75 \$\endgroup\$ – user3310766 May 9 at 22:24
  • \$\begingroup\$ Will one of these work? ledsupply.com/led-drivers/… \$\endgroup\$ – user3310766 May 9 at 22:34
  • \$\begingroup\$ No that will not work because it cannot output a higher voltage than the input voltage. Look for a boost rather than buck driver. \$\endgroup\$ – user1850479 May 9 at 22:43
  • \$\begingroup\$ That COB LEDs have some current stabilization on board. Should be connected straight to voltage source \$\endgroup\$ – user263983 May 9 at 22:49
  • \$\begingroup\$ So would I be safe to connect 3 COBs in parallel to a 12v 12ah battery or I still need to try to find a constant current driver? \$\endgroup\$ – user3310766 May 9 at 22:53
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Since the LEDs are rated for 12 volts, you must connect them in parallel to your 12 volt battery. Since they are rated to draw almost 4 amps each, the battery must be rated to deliver at least 12 amps for the time you want to run the lights.

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  • \$\begingroup\$ Those COBs are just diodes in series with a total forward voltage of 12-14v, so if he puts them in parallel with a 12v battery he will most likely either burn them out or damage the battery. \$\endgroup\$ – user1850479 May 10 at 1:05
  • \$\begingroup\$ I will be carrying all this in a kayak...the leds pictured in the link attached below are 12v and no booster...thinking they must run parallel and perhaps counting on being submerged in water to keep heat down? Just trying to understand how this is even achievable given the comments?? afishnsealights.com/collections/batteries/products/… \$\endgroup\$ – user3310766 May 10 at 11:05

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