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Rectangular aluminium box with side fins and terminal posts

VEVOR

VEVOR 12V 40A DC-DC Battery Charger 500W

SKU CH-FXSG-5HW05

On-board DC-to-DC charger delivers 40 A at 12 V with 500 W peak output for lead-acid and lithium batteries

  • TypeOther Appliances
  • Width7.87
  • Charges lead-acid and lithium batteries from 12 V alternators
  • Smart multi-stage profiles for LifePo4 and lead-acid chemistries
  • 500 W output with built-in over-voltage and reverse-polarity protection
  • Isolated input and output prevents vehicle electrical interference
  • Operates from 4 °F to 122 °F in aluminium alloy casing

On-Board DC-DC Battery Charger

This 12V 40A DC-DC charger delivers up to 500W for charging auxiliary batteries in RVs, trucks and boats. It accepts an input range of 8V to 16V and supports both lead-acid and lithium chemistries. Multi-stage algorithms provide two-stage LiFePO4 and four-stage lead-acid charging profiles. The aluminium alloy casing weighs 1.5 kg and operates from -20 °C to 50 °C.

Suits Dual-Battery Vehicle Builds

Installers adding a house battery to a 12V alternator system will find the isolated input and output useful for protecting vehicle electronics. Built-in over-voltage, under-voltage, over-temperature and reverse-polarity protections add safety margins. The unit is not for buyers who need AC mains charging, higher current than 40A, or support for battery voltages outside the 12.6V to 14.7V output window.

40A Maximum Charging Current

The single specification that decides fit is the 40A peak charge rate at 12V nominal output. Verify that your alternator and wiring can sustain this draw and that your battery bank accepts the 13.2V–14.7V (lead-acid) or 12.6V–14.6V (lithium) voltage range. Four fuses and a manual are included in the package.

Highlights

  • Charges lead-acid and lithium batteries from 12 V alternators
  • Smart multi-stage profiles for LifePo4 and lead-acid chemistries
  • 500 W output with built-in over-voltage and reverse-polarity protection
  • Isolated input and output prevents vehicle electrical interference
  • Operates from 4 °F to 122 °F in aluminium alloy casing

Specifications

TypeOther Appliances
Width7.87

Questions about this item

What input voltage range must my vehicle's alternator supply for the SDC-40A to operate?

The charger accepts DC 8V to 16V from the alternator, so a standard 12 V vehicle system is within the required range.

Will the charger's multi-stage profile work correctly if I keep my existing lead-acid house battery?

Yes, the unit runs a four-stage bulk, absorb, float cycle for lead-acid batteries with a charging voltage range of 13.2 V to 14.7 V.

How can I confirm the charger is delivering the rated 40 A after installation?

Monitor the output voltage; it should sit between 13.2 V and 14.7 V for lead-acid or 12.6 V to 14.6 V for lithium while the charger is in bulk mode.

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