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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Dual Input 25A in-Vehicle DC Battery Charger

Dual Input 25A in-Vehicle DC Battery Charger

Product ID: 337307916

Details

Brand
REDARC
Colour
Black
Product dimensions
12.5D x 26W x
Item weight
0.01 Ounces
Output voltage
12 Volts (DC)

⚡25A dual input power

🔥Heat, water & dust resistant

☀️Simultaneous solar + DC charging

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Description

🔋 Charge smarter, adventure harder — never get caught powerless!

SOLAR FIRST EFFICIENCY - MPPT tech prioritizes solar energy, reducing alternator strain and maximizing green power.
POWER UP ANYWHERE ANYTIME - Dual input 25A charger ensures your auxiliary battery hits 100% no matter the drive.
BUILT TO BRAVE THE ELEMENTS - Potted design resists heat, water, and dust for reliable performance in harsh conditions.
UNIVERSAL BATTERY COMPATIBILITY - Supports AGM, GEL, lead acid, calcium, and LiFePO4 batteries from 75AH to 200AH.
SEAMLESS INTEGRATION WITH ANY VEHICLE - Optimized for both 12V and 24V systems, smart or standard alternators included.

The REDARC Dual Input 25A in-vehicle DC battery charger delivers robust, uninterrupted power by simultaneously harnessing solar and alternator energy. Engineered for extreme conditions with heat, water, and dust resistance, it supports a wide range of battery types and vehicle systems, ensuring your auxiliary batteries stay fully charged on every journey.

Specifications

ASIN	B077JPHCRV
Amperage	25 Amps
Best Sellers Rank	#403,803 in Automotive ( See Top 100 in Automotive ) #1,062 in Battery Chargers
Brand	REDARC
Color	Black
Connector Type Used on Cable	Cigarette Lighter (DC) and Ring Terminal
Current Rating	25 Amps
Customer Reviews	4.8 out of 5 stars 138 Reviews
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	0.01 Ounces
Manufacturer	REDARC Electronics
Mfr Part Number	BCDC1225D
Number of Ports	1
Output Voltage	12 Volts (DC)
Product Dimensions	4.92"D x 10.24"W x 1.89"H
Unit Count	1.0 Count

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$1180.59

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

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