Product fit
Confirm towing, storage, compatibility and the practical details before you commit.
Renogy CORE 12V 40A DC-DC On-Board Battery Charger
A carefully selected camping product from 4Matt Campers, prepared around fitment, stock, options and the way you plan to travel.
From
R3 675.00
Add this product to your quote basket. 4Matt Campers confirms stock, fitment, freight/courier and final pricing before payment.
SKU: Confirm with 4Matt Campers
Aluminium body
Off-road ready
Code B friendly
Options available
No online payment is taken. 4Matt Campers confirms the final quote before you decide.
Overview
Compact, capable and easy to understand.
Product question
Ask about this product.
Send a product-specific question to 4Matt Campers. We will reply with stock, fitment, options, lead time or showroom guidance for this exact product.
Short Product Summary
The Renogy CORE 12V 40A DC-DC On-Board Battery Charger charges your auxiliary house battery from your vehicle's alternator while you drive, with a correct multi-stage charge for lithium, AGM, gel and flooded batteries. It's the reliable way to keep your dual-battery system topped up on the move and protect your starter battery.
Why This Product
Modern smart alternators won't fully charge a lithium house battery directly. A DC-DC charger converts alternator power into a correct, full multi-stage charge — getting the most into your house bank on every drive while keeping your starter battery protected. At 40A it's a strong fit for mid-size dual-battery builds.
Key Features
- 40A DC-DC charging – fast alternator charging of your auxiliary battery.
- Multi-stage charging – correct charge profile for a healthy battery.
- Battery compatibility – lithium (LiFePO₄), AGM, gel and flooded.
- Protects your starter battery – isolates and prioritises correctly.
- Smart-alternator ready – charges house batteries modern alternators won't.
Ideal For
- Caravan, trailer & 4x4 dual-battery builds charging on the move
- Lithium house-battery upgrades behind a smart alternator
- Setups charging mainly from the vehicle (add an MPPT model for solar)
Local Support from 4Matt Campers
4Matt Campers serves the Western Cape and Cape Town, and ships across South Africa — helping clients build reliable 12V and off-grid power systems. We'll help you wire the DC-DC charger correctly to your alternator and house battery.
Technical Specifications
- Brand: Renogy
- Series: CORE
- Type: DC-DC on-board battery charger
- Charge Current: 40 A
- System Voltage: 12 V
- Input: Vehicle alternator
- Charging: Multi-stage
- Battery Types: Lithium (LiFePO₄), AGM, gel, flooded
What's Included
- 1 × Renogy CORE 12V 40A DC-DC Charger
- User manual
Optional Fitment / Upgrade Notes
For a correct install, it's worth confirming:
- Cable sizes from starter battery to charger to house battery
- An ignition / D+ trigger where required for smart alternators
- Whether you also want solar charging (choose a 30A/50A MPPT model)
Complete Your Setup
Browse the full Renogy range and 12V electrical & power gear. Pair it with a lithium battery and a solar panel for a complete charging system.
FAQ
Why do I need a DC-DC charger?
Smart alternators don't fully charge lithium house batteries directly. A DC-DC charger converts alternator power into a correct multi-stage charge, protecting your starter battery.
Does this one do solar?
This 40A model charges from the alternator. For built-in solar charging, choose a DC-DC charger with MPPT (our 30A or 50A models).
Which battery types does it suit?
Lithium (LiFePO₄), AGM, gel and flooded — selectable to match your battery.
4Matt support
Set up around the way you travel.
Options and timing
Your quote can reflect current availability, optional extras and realistic lead times.
Workshop handover
Where relevant, 4Matt can include fitment, collection, delivery and handover guidance.