can this unit be connected to the vehicle alternator to charge 2 batteries. And where can I get more information to read about it ?

The alternator should charge the original vehicle battery, then this unit is connected to get power from the original battery and used to charge a second, back-up battery. The backup battery may have another identical 12v battery connected to it in parallel. The identical battery should be of the same age, brand, size, etc. You can find the owners/installation manual online.

What will happen if my main battery is a 74ah and the auxiliary is a 150ah battery. i’m planning to install the bcdc redarc charger 25a

Hi Mohammed, Thanks for your message. The BCDC operates independently to charge the Auxiliary 150AH battery, so is not critical on the capacity of the Main battery. It is essentially drawing from the Alternator of the vehicle anyway, so capacity is not a big issue. This will work fine with this 25A BCDC size too; perfect for your 150AH battery. Best regards, REDARC.

Necesito comprar algun tipo de relay u otro accesorio, aparte de fusible

Hi there, Thanks for your message. You will not need a relay for this unit, it does all the switching internally. A 40A MIDI type fuse is required however and suitably rated cable to connect the unit up to the Batteries and Solar panel. Best regards, REDARC

Can this be used to charge a Goal Zero or Jackery type lithium power bank?

Goal Zero/Jackery type power banks have internal charging normally. If it has a 12V input, you don't really need an external charger, just a 12v supply from your car, solar controller/converter etc.

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REDARC Dual Input 25A in-Vehicle DC to DC Battery Charger with MPPT Solar Regulator, Green Power Priority, 12V/24V Compatible, for Lithium, AGM, Gel, Lead Acid, Calcium, LiFePO4 Batteries

Product ID: 86240686

Details

Brand
REDARC
Color
Black
Item Weight
0.27 g
Output Voltage
12
Product Dimensions
4.92"D x x

⚡25A dual input power

☀️MPPT solar optimization

🛡️rugged all-terrain durability

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Description

🔋 Power your adventure with unstoppable, smart charging tech!

BUILT FOR EXTREMES - Engineered to survive dust, water, heat (up to 176°F), and vibration—your ultimate off-road companion.
BATTERY VERSATILITY - Supports Lithium, AGM, Gel, Lead Acid, Calcium & LiFePO4 with tailored multi-stage charging.
DUAL INPUT POWERHOUSE - Simultaneously charges from alternator & solar for unstoppable energy flow.
SOLAR SMART WITH MPPT - Maximize green energy with cutting-edge solar tracking and priority charging.
TRUSTED AUSSIE RELIABILITY - Tested in the Outback with 45+ years of REDARC expertise and backed by a 2-year warranty.

The REDARC Dual Input 25A DC to DC Battery Charger combines vehicle alternator and solar inputs with MPPT solar regulation to efficiently charge a wide range of 12V/24V batteries. Designed for rugged off-road and overlanding use, it delivers reliable multi-stage charging for battery banks from 75–200AH, with sealed electronics built to withstand extreme heat, dust, water, and vibration. Trusted for over 45 years and backed by a 2-year warranty, this charger ensures your secondary battery stays powered wherever your journey takes you.

Specifications

ASIN	B077JPHCRV
Amperage	25 A
Best Sellers Rank	#788,970 in Automotive ( See Top 100 in Automotive ) #1,633 in Battery Chargers
Brand	REDARC
Color	Black
Connector Type Used on Cable	Cigarette Lighter (DC) and Ring Terminal
Current Rating	25 A
Customer Reviews	4.7 4.7 out of 5 stars (141)
Global Trade Identification Number	09338628004348
Input Voltage	12 volts
Item Dimensions D x W x H	4.92"D x 10.24"W x 1.89"H
Item Weight	0.27 g
Manufacturer	REDARC Electronics
Mfr Part Number	BCDC1225D
Number of Items	1
Number of Ports	1
Output Voltage	12 volts_of_direct_current
Specification Met	FCC
Unit Count	1 Count

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B/.1659

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Panama.

Secure transaction

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