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Soneil 48v 6 Amp Constant Current World Smart Charger SON4812SR

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Charger ships with the Soneil 3 prong connector as shown in second picture.

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Product InformationStore Part Number: SON4812SR


Protection provided: Reverse Polarity, Short Circuit, Over-Voltage, Over Current and AC Surge. Soft Start and Stop; Starts and stops gradually. No sudden in-rush of current, this protects both the batteries and any other circuits connected to the charger.

Soneil’s Battery Charger transforms the 115/230 VAC into 48 VDC at about 100,000 Hz (3333 times faster than conventional charger), which requires a much smaller transformer and thus results in a unit of smaller size, low weight and improved efficiency. The 2416SRF uses sophisticated electronic circuitry with microchips. All present day computers use switch-mode technology.

Stage 1: Deep Discharge Charging Pulse Mode
The Charger starts charging at 0.5V and give pulse current up to 5V. This has effect of removing loose sulphation formed during deep discharge state of the battery.

Stage 2: Constant Current Mode (CC)
The charger changes to constant current 6.0A. When the battery voltage reaches up to 57.6, the charging stage changes from (CC) Constant Current to CV (Constant Voltage) mode.

Stage 3: Constant Voltage Mode (CV)
The charger holds the battery at 57.6V and the current slowly reduces. When the current reaches at 0.5 C (C= Battery Capacity), this point called the Switching Point. The Switching Point is one of the great features of this battery charger that it can adjust the current automatically according to the battery capacity. Other chargers without microprocessors are not capable to adjust the current automatically.

Stage 4: Standby Voltage Mode
The charger maintains the battery voltage at 54.8V and current slowly reduces to zero. This charger can be left connected indefinitely without harming the battery.

If the battery voltage drops to 54.2, the charger changes from any mode to Constant Current mode and restart charging. The charging cycle will go through Stage 2 to Stage 4.

This charger typically ships without output connectors, allowing the customer to adapt the charger to their specific needs.


  • Totally Automatic Switch-Mode Battery Charger
  • Suitable for Gel, Sealed (AGM) and Wet Lead Acid Batteries
  • Suitable for use anywhere in the world.
  • Dual Voltage-Switch selectable 115/230 VAC 47 to 62 HZ
  • Automatic Cut Off and then True Float. Can be left connected indefinitely without harming the battery.
  • Two color LED to indicate charge status
  • CE European Std.EN60335 Part 2.29 and CE ENC Directive Listed
  • Mean Time between failures 50,000 hours
  • Zero Current Drain when AC power is off
  • Very low start voltage 0.5
  • Fan cooled circuitry
  • Optimal 3 Step Charging
  • Built-in Mode Indicators
  • Demand Sensing
  • Reverse Polarity Protection
  • Over Voltage Protected
  • Short Circuit Protection
  • Overload Protection
  • Thermal Protection
  • 1 year Warranty

Tech Specs

  • Dimensions (LxWxH): 8.5 . x 4.25 x 2.25 in
  • Weight: 2 lb
  • Shipping Weight: 3.5 lb
  • Max Current, During Bulk Charge: 6 A
  • Absorption Voltage: 57.6
  • AC Input Volts: 115/230 V
  • Manufacturer: Soneil
  • AC Input Amps: 5.0 @ 120 VAC
  • AC Input Volts Freq.: 47/63 Hz
  • AC Input Volts Range: 90–264 V
  • Float Voltage: 54.8
  • Output Banks: 1
  • Regulatory Approval: CE, ROHS
  • Manufacturer Part #: SON4812SR

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Reviews and Ratings

3.00 Average
5 Stars 1
4 Stars 0
3 Stars 0
2 Stars 0
1 Stars 1
Rated 3.00/5 Stars from 2 customer reviews.

Do you own the SON4812SR? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

Not well built
Pros: Was shipped to me quickly.
Cons: Tried to use to charge 48vdc battery checked polarity and voltage. Hooked it up and it fried and now it does not produce any voltage.
Is this review helpful?
Written by on Mar 18, 2014. Ownership: Just Bought. Knowledge Level: Genius is my way of life — (88 of 168 customers found this review helpful
Great Product
Pros: I bought this charger to mount on board my electric motorcycle. I did a lot of research to find the right one before selecting the SON4812SR model. This charger is both smaller is size, lighter, and much cheaper than other 48v chargers. Despite the cost, the quality of the device looks great. Bottom Line: I would buy this one again.
Cons: 1. The first one i bought came from a defective lot and did not function properly. Batterystuff recognized this and sent me a new one. No problem! 2. I wish they used more LEDS instead of a color changing LED, the color difference is subtle. 3. Also the charger feedback only informs you if it is in charging mode or trickle charge mode. It does not indicate battery state of charge.
I wish Soneil offered this charger with larger charging currents.
Is this review helpful?
Written by on Mar 31, 2013. Ownership: Use regularly. Knowledge Level: Genius is my way of life — (90 of 169 customers found this review helpful

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Manuals & Tutorials

Operating Instructions

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