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Soneil 48v 3.5 Amp Constant Current World Smart Charger Son4808SRF

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Product InformationStore Part Number: Son4808SRF


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 this results in a unit of smaller size, low weight and improved efficiency. The 4808SRF 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 3.0A. 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 57.2V and the current slowly reduces. When the current reaches 0.5 C (C= Battery Capacity), it is 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 of adjusting the current automatically.

Stage 4: Standby Voltage Mode
The charger maintains the battery voltage at 55.2V and current slowly reduces to zero. Charger can be left connected indefinitely without harming the battery.

If the battery voltage drops below to 55.2V, 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 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 Listed & Meets European EMC Directive
  • Mean Time between failures 30,000 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
  • Line Regulation
  • Thermal Protection
  • 1 year Warranty


*Flat Rate shipping is for the lower 48 states only.

Tech Specs

  • Dimensions (LxWxH): 6.9 x 3.7 x 1.9 in
  • Weight: 1.7 lb
  • Shipping Weight: 3.0 lb
  • Max Current, During Bulk Charge: 3.5 A
  • Absorption Voltage: 57.6 V
  • AC Input Volts: 115/230 V
  • Manufacturer: Soneil
  • AC Input Volts Freq.: 47/63 Hz
  • AC Input Volts Range: 90–264 V
  • Float Voltage: 55.2 V
  • Output Banks: 1
  • Regulatory Approval: CE Listed & Meets European EMC Directive
  • Manufacturer Part #: Son4808SRF

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Reviews and Ratings

4.50 Average
5 Stars 1
4 Stars 1
3 Stars 0
2 Stars 0
1 Stars 0
Rated 4.50/5 Stars from 2 customer reviews.

Do you own the Son4808SRF? 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.

48v Soneil Charger
Pros: Easy to use, operates exactly how I had hoped it would. Maintains my 48v battery bank daily.
Cons: Does not operate well when running it off of an inverter. When using with an inverter, it charges the batteries but only in a trickle mode. When plugged into a wall outlet, all stages are operational.
Is this review helpful?
Written by Anonymous on Feb 12, 2012. Ownership: Use regularly. Knowledge Level: AC/DC is more than a band — (81 of 158 customers found this review helpful
Soneil 4808SRF Charger
Pros: Have used the soneil battery charger for 15 years. I have left it attached to my golf cart for 4 months unused, Batteries were fine. Have always left the charger turned on and batteries lasted 6+ years. Charger has been fantastic.
Cons: None
Is this review helpful?
Written by GaryA on Nov 21, 2017. Ownership: Use regularly. Knowledge Level: Genius is my way of life — (2 of 3 customers found this review helpful

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Manuals & Tutorials

Chargers Tutorial

Order Line: 1-800-362-5397
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Tech Help: 541-474-4421
Fax: 541-471-6014
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