Can it charge from solar and the alternator at the same time?

It has a solar panel input with MPPT alongside the DC input. The MPPT handles the solar side efficiently, but treat it as one charger with two sources rather than two independent chargers.

Which batteries does it support?

LiFePO4, lead-acid, GEL and AGM, plus most portable power stations. You set the battery type with the two DIP switches.

Does it work in a 24V truck charging a 12V battery?

Yes. It accepts 12V or 24V input and outputs 12V or 24V, so 24V-to-12V setups are supported.

What is reverse charging for?

It lets the charger send power back to a starter battery, so a drained starting battery can be topped up from the house bank in an emergency.

What comes in the box?

The charger, an XT60 quick-connect cable and a pair of DIP switch keys.

Is 40A too much for my wiring?

At 40A you need thick cable and a fused connection sized for the current. Check your alternator and cable rating before installing.

Where is the KFFKFF DC to DC Charger with MPPT cheapest?

At Walmart, for $109.99, as of our latest check.

What do buyers say about the KFFKFF DC to DC Charger with MPPT?

Rated 5 out of 5 from 2 ratings.

KFFKFF DC to DC Charger with MPPT

Best price now

$109.99at WalmartChecked Nov 12

Prices are checked against each store and labelled with when.

Visit Walmart

KFFKFF DC to DC Charger with MPPT

Best price now

$109.99at WalmartChecked Nov 12

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $109.99 at Walmart on Nov 12.

Our take on the KFFKFF DC to DC Charger with MPPT

The KFFKFF DC to DC Charger is a 520W, 40A dual-battery charger for vehicles and off-grid setups. It accepts a solar panel input through an MPPT controller, so one unit can charge from the alternator or from solar. It handles 12V and 24V systems on both input and output, and supports LiFePO4, lead-acid, GEL and AGM batteries plus most power stations. It also does reverse charging to top up a starter battery from the house bank. Against simpler DC to DC units, the built-in MPPT and wide voltage range are the main draws; it is a larger, more complex install than a basic isolator.

Best forRV and camper owners running a house batteryVan and truck builds with solar on the roofBoats needing alternator and solar chargingOff-grid and work vehicles with 12V or 24V systems

Pros

40A output at up to 520W for fast house-battery charging
Built-in MPPT for solar panel input
Works with 12V and 24V on both input and output
Supports LiFePO4, lead-acid, GEL, AGM and most power stations
Emergency reverse charging to top up a starter battery
XT60 quick-connect cable and DIP switches for battery-type setup

Cons

DIP switches set battery type, so changing chemistry means reaching the unit
No Bluetooth or app monitoring; status is a simple LED indicator
Needs heavy-gauge wiring and a proper install for 40A
Large output means heat and ventilation matter in tight spaces

KFFKFF DC to DC Charger with MPPT prices at every store

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$109.99Free shippingChecked Nov 12
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KFFKFF DC to DC Charger with MPPT price history

Lowest price we've seen: $109.99 on Nov 13 at Walmart. Tracked across 1 store since Nov 13.

About the KFFKFF DC to DC Charger with MPPT

This is a 520W, 40A DC to DC charger with an MPPT function. It accepts solar panel input and also supports emergency reverse charging. It works with 12V and 24V systems.

It charges LiFePO4, lead-acid, GEL and AGM batteries, and works with most power stations. Two DIP switch keys let you adjust the charger for the battery type in your setup. An LED indicator shows the charging status in real time.

The charger connects with an XT60 quick-connect cable. It has protection against overvoltage, undervoltage, reverse polarity, overheating and short circuits. It is designed for RVs, cars, boats and trucks.

Model: C40AMPPT
Input voltage: 12V/24V
Charging voltage: 12.6V-29.4V
Charging current: 40A
Max output: 520W
Battery types: LiFePO4, lead-acid, GEL, AGM
Solar input: Supported, with MPPT function
Connector: XT60 quick-connect cable
Display: LED indicator
Protections: Overvoltage, undervoltage, reverse polarity, overheating, short circuit
Use: RVs, cars, boats, trucks
In the box: 1 x DC to DC charger, 2 x DIP switch keys, 1 x user manual

Specifications

color: MulticolorSource

Questions and answers

Can it charge from solar and the alternator at the same time?: It has a solar panel input with MPPT alongside the DC input. The MPPT handles the solar side efficiently, but treat it as one charger with two sources rather than two independent chargers.
Which batteries does it support?: LiFePO4, lead-acid, GEL and AGM, plus most portable power stations. You set the battery type with the two DIP switches.
Does it work in a 24V truck charging a 12V battery?: Yes. It accepts 12V or 24V input and outputs 12V or 24V, so 24V-to-12V setups are supported.
What is reverse charging for?: It lets the charger send power back to a starter battery, so a drained starting battery can be topped up from the house bank in an emergency.
What comes in the box?: The charger, an XT60 quick-connect cable and a pair of DIP switch keys.
Is 40A too much for my wiring?: At 40A you need thick cable and a fused connection sized for the current. Check your alternator and cable rating before installing.
Where is the KFFKFF DC to DC Charger with MPPT cheapest?: At Walmart, for $109.99, as of our latest check.
What do buyers say about the KFFKFF DC to DC Charger with MPPT?: Rated 5 out of 5 from 2 ratings.