Electronic module with heat sinks on a white background

12V to 28V 40A 1120W DC DC Step Up Converter Charger Voltage Regulator ACC Enable

SKU: A1C28C40

$180.00

Quantity

Estimate delivery times: 12-26 days (International), 3-6 days (United States).

Return within 30 days of purchase. Duties & taxes are non-refundable.

Guarantee Safe Checkout

12V to 28V 40A 1120W DC DC Step Up Converter Charger Voltage Regulator ACC Enable

Wide input voltage from 12V

The output voltage is a stable 28V

Charges a 24V lead-acid or lithium battery

The charger works only when the engine is on

( Please ensure the engine is on for the charger to work. If charging from the primary battery without the vehicle, this model won't work. )

Works for appliances from 0AMP to 40AMP automatically

ACC Enable

100% full rated power

100% full stable output current

100% burn-in test

High-efficiency up to 96%

Waterproof sealed

Cooling by free air convection

Surface mountable

Over-current, over-voltage protections

Over-temperature protection

According to:

EN 61000-6-3:2007/A1:2011/AC:2012

EN 55014-1:2006/A2:2011 EN 60950-1:2006/AC:2011

Efficiency: 95%

Input Voltage: 12V DC

Output Voltage: 28V

Output Current: 40A

Ripple: 200mVp

Line Regulation: ±0.2%

Load Regulation: ±0.2%

Voltage Accuracy: ±1.5%

Enclosures: IP68

Dimension: 220*130*50mm

Net Weight: 2.2kg

Operating Temperature: -40~85°C

Certificates: CE, ROHS

Warranty: 3 years

Located in	CN, US, DE, AU, UK, FR

Let customers speak for us

from 74 reviews

36v 15 amp VR

Works great, supports required load with issues.

tyler biddix

09/23/2026

Built solid for marine use

36V 48V to 13.8V 100A 1380W DC DC Step Down Converter Voltage Regulator w/ACC Hope to have many years of use.

donald heldoorn jr

09/21/2026

36V 48V to 12V 100A 1200W DC DC Step Down Converter Voltage Regulator w/ACC

jonah beverly

09/12/2026

48V 60V 72V to 12V 50A 600W DC DC Step Down Converter Voltage Regulator w/ACC Swtich

Daeng Siswa

09/01/2026

Best converter I have installed

The old converter started burning after a corrotion problem on the output terminals. Due to salt water dripping on the unit the hole plastic in front melted. This had nothing to do with the converter itselves, but from an outside source.

Ordered a new one with express shipping to Norway an received it 6 day later on my doorstep. The new one worked flawless and thanks for your service regarding info and shipment.

I will strongly recomend both the product and the supplier :-)

Erik Bergendahl

08/04/2026

Great stuff

looks great easy to set up and waterproof well

Luca Knol

07/21/2026

24V to 12V 50A 600W DC DC STEP DOWN CONVERTER VOLTAGE REGULATOR W ACC SWITCH

works great as expected, 2 months in

Rejean Houle

07/08/2026

Well built

Great product, works as advertised, they gave me excellent advice, robust and very well built.

Mike Daynes

06/30/2026

Just what I needed.

I've had other stepdowns before for my outequippro 12v A/C. None of which could handle turbo mode. Or they would cause the ac unit to make a clunking noise. However this stepdown kept my AC running in turbo for as long as I needed it to. Great product. I wish it had a fan to cool things down though. The body can get really hot.

Anonymous

06/26/2026

Prompt Service

Prompt Service. Well constructed. Nice form factor. As advertised.

What more could I ask?

Farrah Dickerson

06/19/2026

Highly Recommend

Easy to order, very good quality equipment, very good communication. Excellent all round service

Andrew Glover

04/16/2026

Good Product