ATEM POWER 40A DC to DC Battery Charger with Anderson Plug Reverse Charge Solar Input MPPT for AGM, Gel, Calcium, Lead Acid, LiFePO4 Batteries of 4WDs, RVs, Campers, Trailers On-Board Charger

I have to say I was skeptical at first reading some of the reviews but this DC to DC charge controller works amazingly well. I got the 25 amp model and it provides 24.9 to 25 A without any issue. It charges the lithium iron phosphate battery, far quicker than just having a direct connection with a relay to my start battery, the relay would engage when the alternator started putting out power but I noticed I was only charging in about 17 A MAX because the voltage was not quite high enough as the vehicle battery was a lead acid battery and that charged around 13.8V…but the lithium ion battery would like to see 14.6 so this actually has a boost converter in it that will raise the voltage from the 13.8 available in the car to about 14.8 V to charge the lithium, iron phosphate battery, it appears to have a smart regulating technology in it , so it does not give too much voltage to the battery but enough for it to charge quickly. Overall, it’s very well-built, easy to use. Has a nice heat sink that does not require the use of a fan to keep it cool, this is a nice feature, so I don’t have to listen to any noisy fans as it was very quiet and it appears to , keep my lithium battery very happy

Great product, reliable

Most of the competition includes the Anderson connectors for your wires you are connecting to the dc to dc charger. I was not able to source them local so had to oder them and it delayed my install

This is a great unit, I traveled around the country charging a 12v 300ah lithium iron phosphate battery (LiFePO 4 battery) with this unit. I choose this as 25amp off a double fuse in a Toyota Sienna isn't so much pull that you need to worry about your alternator being overload at any time. Or figuring out how to wire in a 40 amp connector to the interior of the car. Gets warm with use, but within normal parameters. Also I briefly used the solar inputs as well.

Great product, great price, fast delivery.

This is a second time purchase. Good device for charging dc to dc.

Worked as advertised

The build quality is good. Metal case, Anderson plugs for connection easy to install. However you get what you pay for. I installed this in an vehicle with regular (not smart) alternator and a 12v 100w solar panel connected to a lifepo battery about as basic as you can go. The solar controller has a hard time locking on and start charging even in decent conditions, a cheap renogy pvm does a better job. The unit stopped working altogether after 18 months (both dc to DC and solar) out of warranty and not worth fixing. Replaced with Victron DC to DC Charger and a renogy pvm I still had and much better performance.

Muito bom mesmo

The charger is good. But it does not deliver 40A as claimed! I have used it for a month now, and the best i got was 25A max. Sometimes it cannot deliver more than 10A even, depending on the temperature. It is installed in a ventilated location. It's charging a 100 AH Lifepo4 battery, and I run a fridge in my Jeep. I struggle to keep the battery charged.

Ok