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The Epoch 48V to 12V Voltage Reducer is a 25A DC-DC step-down converter that safely runs 12V lights, radios, USB chargers, horns, soundbars and other accessories from a 48V lithium battery system. Upgrading to 48V lithium should not mean frying your 12V electronics: this reducer takes high-voltage battery power and provides stable 13.5V DC accessory power for golf carts, boats, RVs, off-grid systems and custom lithium builds.
It accepts a wide 40-90V DC input, delivers up to 25A of 12V-class output, and includes a KEY ON+ trigger wire so it can switch with the cart or system key circuit. A rugged finned heat-sink housing, integrated mounting ears and a pre-attached wiring harness make for a clean, durable installation.
Key Features
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48V to 12V voltage reducer: Steps a 48V lithium battery system down to stable 12V accessory power.
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25A output class: Supports up to 25A of 12V-class accessory load when wired within the published rating.
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13.5V DC output: The product label shows a 13.5V output, ideal for common 12V accessory systems.
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Wide input range: The product label shows 40-90V DC input compatibility for 48V-class systems.
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Key-on trigger wire: A dedicated KEY ON+ wire lets the converter switch with the cart or system key circuit when installed correctly.
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Rugged finned housing: Heat-sink style aluminum housing helps dissipate heat in demanding mobile applications.
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Plug-and-play harness style: A pre-attached wiring harness supports cleaner installation than loose converter modules.
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Accessory protection: Helps prevent electrical damage caused by accidentally feeding 48V power into 12V electronics.
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Golf cart ready: Excellent for 48V golf cart light kits, horns, radios, soundbars, USB ports and turn signals.
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Marine and off-grid use: Useful for boats, RVs, cabins and 48V lithium battery systems that need 12V accessory circuits.
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Compact mounting tabs: Integrated mounting ears make it easier to secure the converter in a battery bay or accessory compartment.
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Cleaner wiring: Centralizes 12V accessory power instead of tapping a battery or creating unsafe workarounds.
Key Benefits
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48V to 12V: Step down
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25A: Output class
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13.5V: DC output
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40-90V: Input range
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Key-on: Trigger wire
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DC-DC: Converter type
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25A output: Accessory power capacity
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13.5V output: Stable 12V-class supply
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40-90V input: Wide 48V-class range
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Key-on wire: Switched install support
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Rugged housing: Finned heat sink design
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Accessory safety: Prevents overvoltage damage
Safely Power Your 12V Accessories from a 48V Battery
A required safety component for many 48V golf cart, marine, RV and lithium battery systems.
Standard golf cart accessories and low-voltage electronics are usually designed for 12V power. If you connect headlights, soundbars, horns, radios, USB chargers or other 12V accessories directly to a 48V lithium battery, the overvoltage can instantly damage the equipment.
This reducer bridges that gap by stepping 48V battery power down to stable 13.5V DC accessory output, making it a smart add-on for 48V lithium golf cart conversions, marine accessory wiring, RV and camper systems, and off-grid power builds.
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Protect your lights, radios and USB chargers: This DC-DC step-down converter safely drops 48V power to 12V-class accessory voltage so you can power LED headlights, tail lights, turn signals, horns, stereo systems, light bars, USB chargers and other low-voltage devices without exposing them to destructive 48V input.
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Essential for single-block lithium upgrades: On old lead-acid setups, some DIYers tapped one 12V battery in a series bank. With a modern single-block 48V lithium battery, that approach is no longer available. A dedicated voltage reducer is the correct way to power 12V accessories from a 48V lithium system.
Heavy-Duty Design for Golf Carts, Marine, RV and Off-Grid Systems
A rugged reducer for 48V lithium accessories and mobile installations.
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Finned heat-sink housing: The black aluminum-style finned housing helps dissipate heat during accessory loads.
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25A continuous output class: Listed as a 25A converter, giving builders more accessory capacity than many small 5A or 10A reducers.
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Key-on trigger wire: The label identifies a KEY ON+ input so the reducer can be tied to a switched circuit when installed correctly.
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Compact mounting tabs: Integrated mounting ears help secure the converter in a cart battery bay, boat compartment, RV cabinet or off-grid control panel.
Recommended Add-Ons for a Clean 12V Accessory Circuit
Build a safer, cleaner low-voltage accessory system with:
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Distribution: 12V power distribution block or fuse panel for clean accessory wiring.
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Fusing: Inline fuses or breakers sized for the 25A output and your accessory circuit.
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Wire protection: Marine-grade wire, heat shrink, loom and strain relief for protected cable routing.
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Terminals: Ring terminals, butt connectors or vehicle-specific plugs appropriate for your installation.
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System parts: 48V lithium golf cart battery kit, battery gauge, charger port plug and mounting hardware.
Compatibility
- 48V-class lithium battery systems within the 40-90V DC input range
- 12V accessory loads totaling no more than the 25A output rating
- Not for charging a 12V battery unless Epoch explicitly approves that application
Wiring Reference
- Yellow: 40-90V DC positive input
- Black: 40-90V DC negative input
- Orange: KEY ON+ switched trigger input
- Red: 13.5V DC positive output
- Black: 13.5V DC negative output
- Always verify the current label and included instructions before connecting power.
Suitable For:
- 48V golf cart lithium conversions that need safe 12V accessory power
- 48V lithium battery accessories, including lights, horns, radios, stereos, USB ports and soundbars
- Golf cart voltage reducer installations for Club Car, EZGO, Yamaha, ICON, Evolution and similar 48V platforms where wiring is compatible
- Marine step-down converter use for low-voltage accessories on compatible 48V battery systems
- RV, camper and off-grid systems using a 48V battery bank but needing 12V accessory loads
- Solar and power-wall projects where a 48V battery bank must run 12V control circuits or auxiliary electronics
- DIY golf cart builders replacing unsafe battery taps with a dedicated DC-DC step-down converter
- Electric utility carts, hunting buggies and neighborhood carts that need stable 12V accessory power
Please Note: This is a voltage reducer, not a battery charger.
Please Note: Use proper input and output fusing, correct polarity, secure mounting and protected cable routing, and keep the total 12V accessory load within the 25A rating.
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Specifications
General
Brand: Epoch Batteries
Product name: 48V to 12V (25A) Voltage Reducer & Step Down Converter
SKU: 48V-12V-voltage-reducer
Product type: DC-DC step down converter / voltage reducer
Primary use: Converts 48V-class DC battery power to 12V-class accessory power
Electrical Specifications
Input voltage: 40-90V DC, per product label
Output voltage: 13.5V DC, per product label
Rated output current: 25A
Estimated output power: Approx. 337.5W at 13.5V x 25A
Key-on trigger: KEY ON+ wire shown on product label
Input positive wire: Yellow, per product label
Input negative wire: Black, per product label
Output positive wire: Red, per product label
Output negative wire: Black, per product label
Mechanical and Connector Details
Housing: Black finned heat-sink style housing
Mounting: Integrated mounting ears / tabs
Connector / harness: Pre-attached harness with multi-pin connector
Waterproof rating: IP67
Compatibility
Battery system: 48V-class lithium battery systems within the listed input range
Accessory system: 12V accessory loads within the converter's 25A rating
Common applications: Golf carts, marine accessories, RV/camper accessories, solar/off-grid auxiliary loads
Not for: Charging a 12V battery unless Epoch explicitly approves that application
Installation Guidance
Protection: Use proper input and output fusing based on system design and accessory load
Switching: Use the KEY ON+ wire with an appropriate key-switch circuit when possible
Cable routing: Protect wiring from heat, abrasion, sharp edges, and moving components
Verification: Confirm polarity, fuse size, and total accessory load before powering the system
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Installation Guidance
- Protection: use proper input and output fusing based on system design and accessory load.
- Switching: use the KEY ON+ wire with an appropriate key-switch circuit when possible.
- Cable routing: protect wiring from heat, abrasion, sharp edges and moving components.
- Verification: confirm polarity, fuse size and total accessory load before powering the system.
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Why do I need a 48V to 12V voltage reducer for my golf cart?
Most golf cart accessories, including LED headlights, tail lights, horns, radios, USB chargers and soundbars, are designed for 12V power. Connecting those accessories directly to a 48V lithium battery can damage them immediately. A 48V to 12V voltage reducer safely steps the battery voltage down to stable 12V-class accessory power.
What is the difference between a voltage reducer and a step-down converter?
They are two common names for the same type of component. Golf cart owners often call it a voltage reducer, while marine, RV and solar builders often call it a DC-DC step-down converter. In both cases, the device converts a higher DC voltage into lower 12V accessory power.
Can't I just wire my accessories to one battery like I used to?
No, not when you are using a single-block 48V lithium battery. Older lead-acid golf carts sometimes tapped one 12V battery in a series pack, but that causes imbalance and is not possible with a single 48V lithium pack. A DC-DC voltage reducer is the correct way to power 12V accessories from a 48V lithium system.
How many amps does this voltage reducer output?
This reducer is a 25A model. Its product label shows a 13.5V DC output, which supports typical 12V accessory loads such as lights, horns, radios, USB ports and soundbars when the total draw is within the converter's rated output.
Is this voltage reducer waterproof?
The technical specifications list an IP67 waterproof rating, and the converter uses a rugged finned housing and covered wiring harness. If your installation depends on a specific waterproof rating for a wet or exposed location, confirm the rating on the unit's current label before installing.
Will this drain my 48V battery when the cart is turned off?
The product label shows a dedicated KEY ON+ wire. When installed through the proper key-switch or ignition circuit, that trigger wire can help the converter power on only when the vehicle or system is switched on. Follow the wiring diagram and confirm the correct key-on circuit before installation.
How difficult is it to wire this step-down converter?
Installation is straightforward for a qualified DIY installer. The product label identifies input, output and key-on wiring: 40-90V positive and negative input, a KEY ON+ trigger wire, and 13.5V positive and negative output. Use proper fusing, connectors, strain relief and wire protection for your application.
What can I power with this 48V to 12V converter?
It is intended for 12V accessories such as LED headlights, tail lights, turn signals, horns, radios, stereos, USB chargers, light bars, small fans and other low-voltage accessories. Always add up total accessory current draw and stay within the converter's 25A rated output.
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Epoch Batteries Limited Warranty
Warranty Period
1-year limited warranty
Epoch Batteries-branded products are covered against qualifying defects in materials and workmanship for the applicable warranty period, subject to Epoch's model-specific remedy schedule and the terms of its warranty policy. Epoch-branded chargers carry a 2-year limited warranty and accessories (such as fuel gauges and voltage reducers) a 1-year limited warranty, from the original purchase date.
Registration
Register your battery with Epoch within 90 days of purchase for full warranty coverage. If it is not registered within that time, the warranty period begins from the battery's original manufacturing date. Proof of ownership is required for any claim, and coverage is non-transferable and applies only to the original purchaser.
Remedy
After inspection and testing, Epoch will provide the applicable remedy for a qualifying manufacturing defect: an approved repair, a replacement, or a comparable-product offer according to the model's schedule. Typical repair turnaround is 3–10 business days once the product is received.
Exclusions
Coverage may be denied when a failure is caused by misuse, improper handling, installation or storage, or use outside the product's specifications. Examples include an unsecured battery; loose, corroded or improperly connected terminals; series or parallel connections beyond the manufacturer's recommendations; reverse polarity or short circuits; impact, fire or water submersion; storage above 140°F or below -40°F; prolonged storage fully discharged or batteries left uncharged for more than three months; poor crimps, undersized cables or damaged wiring; opened, modified or tampered products; and use in applications the battery was not designed for, including repeated engine starting on non-cranking models.
Obtaining Warranty Service
Start a claim through the Epoch Batteries Warranty Portal with your model and serial number, proof of purchase, a description of the issue and supporting photos or videos. If approved, Epoch provides an RMA number and packing instructions. Do not ship a product without a valid RMA. The customer arranges and pays for shipment to Epoch, packaged in compliance with lithium battery shipping rules. Epoch Batteries can be reached at 1-888-501-1846 or support@epochbatteries.com.
Visit Epoch's Warranty Page to review the full warranty terms.
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Shipping is typically through freight carriers and the actual shipping time is contingent on your location and the specific warehouse dispatching your order. Please allow for a 1-3 business day processing period before shipment, and an estimated delivery time of up to 7 business days. Your confirmation email will include delivery details and we will send you a tracking number as soon as one is available. If you ordered several separate items, you may receive multiple tracking numbers. Once the item has been shipped, the freight service will contact you to coordinate the date and time of delivery. If you require any special accommodations during delivery please let us know as soon as possible and let the delivery company know when arranging the appointment.
Typically, orders will be dropped off either curbside or outside your front door or garage. It is your responsibility to bring the order inside or to its final destination and to remove any existing items.
Depending on the item, parts may be shipped in multiple boxes, and assembly may be required. When your order is delivered, please check that you have all pieces of the item and that nothing is damaged. If your order is damaged during transit and external damage is visible, note the damage immediately, write it on the delivery documents, take photos and/or videos, and refuse shipment. If there is no visible external damage, accept the package but note “subject to concealed damage” on the delivery documents. Any damage upon delivery needs to be reported within 24 hours of delivery or you may not be eligible for a refund. For additional information on submitting claims, as well as incorrect item exchanges, and replacements, please see our Refund Policy.
For more information about shipping, please visit our complete Shipping Policy.
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