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

🛡️IP sealed, rugged build

$1659.64

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Description

⚡ Power your off-grid adventures with smart, rugged dual charging!

BUILT TO BRAVE EXTREME CONDITIONS - Fully sealed electronics withstand water, dust, heat up to 176°F, and vibration.
DUAL POWER INPUTS FOR ULTIMATE CHARGING - Simultaneously charges from alternator & solar for nonstop energy on the move.
TRUSTED RELIABILITY BACKED BY 45 YEARS - Engineered in the Australian Outback with a 2-year warranty and global support.
MULTI STAGE CHARGING FOR ALL BATTERY TYPES - Smart charging profiles extend battery life for Lithium, AGM, Gel, Lead Acid & more.
MPPT SOLAR REGULATOR WITH GREEN POWER PRIORITY - Maximizes solar efficiency first, reducing alternator load and fuel consumption.

The REDARC Dual Input 25A DC-DC Battery Charger is a versatile, solar-ready in-vehicle charger compatible with 12V/24V systems and multiple battery chemistries. Featuring MPPT solar regulation and Green Power Priority, it optimizes solar energy use while charging from your vehicle alternator simultaneously. Designed for harsh environments, it offers fully sealed electronics resistant to water, dust, heat, and vibration. Ideal for overlanders, RVers, and professionals needing reliable off-grid power, it supports battery banks from 75–200AH and comes with a 2-year warranty backed by REDARC’s 45+ years of trusted engineering.

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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$1659.64

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered 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 Ecuador.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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