Cllena DC/DC 12V to 24V Boost Converter 20A 480W Step Up Voltage Regulator Module Car Power Supply Voltage Transformer (Input 10V-16V)

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This is an awesome Step-Down Converter. It does the conversion flawlessly with pretty much no loss of power. Please note that the contacts (24IN / GROUND / 12OUT) are pretty close together and require extra vigilance. Note that I also tried the 100A one and it works well

I had a 24v Webasto i needed to run off 12v, worked perfectly.

This is one of the most useful upgrades I've made to my boat. I boat-in remote camp for a week at a time. With long days on the water and not recharging every night, I sometimes end up with a dead starting battery due to livewells, stereo/amp, and other things running. This unit allowed me to rewire nearly all 12v accessories to my 36v trolling motor battery bank so that my starting battery always has power. And it pulls power from across all three batteries for even wear vs connecting accessories directly to individual batteries in the bank. One note: I read some reviews that state the unit was shorted upon arrival due to a significant spark created when attempting to connect the unit. I had the same experience. After emailing Cllena directly (thinking the unit was shorted), I was advised this is common and got some great help from them. I ended up putting a 50 amp switchable breaker in line between from the 36v bank and power input on the converter. Since the switch was off, I had no spark when connecting. I switched it on, and voila! It worked perfectly. So, don't assume a big spark is a sign of a short - it's just a result of 36v vs what some might be used to in 12v systems.

The device works great. 12v to 24v more than handles the load.

My Bluetti AC200 and AC200P 'solar generators' will charge at 100 watts from a 12v source OR 200 watts if from a 24v source. I had a LiFePo4 280ah 12v pack set up that has gobs of power but would take forever to charge the Bluetti at 100 watts. I figured if I could boost the voltage from the LiFePo4 pack to 24v, then I could supply the Bluetti with 200 watts of recharge when it needed it. The large LiFePo4 battery pack is charged by 1500w of solar so it had plenty available. In short, it worked like a charm! This device supplied 204 watts of 24vdc power to the Bluetti to keep is topped off while pulling 16.8 amps from the 12v battery. I used it like this for several months without a problem and can attest that it works great; just make sure your wiring from the battery to the 12-24v booster is of sufficient gauge. I recently upgraded the battery pack to 24v so I just bought the 24v-to-48v version of this product so I can charge the Bluetti at a full 700 watts at 48v from a 24v source. Since the unit is rated at 960w (20a), I do not expect any problems at all. I'll add the review on that product once I have it for a few months. Highly recommend!