ECO-WORTHY 12V 40A DC to DC Charger with Solar Charge Controller Built-in,2 in 1 On-Board Battery Charger with MPPT LiFePO4 Lithium Battery Gel AGM, Multi-Stage Charging for Solar Panel Alternator

got this for my Dually so I could put a battery in the back of the truck to run the Fuel pump on my external tank. this device will charge the extra battery while the Vehicle is running, or can be hooked up to a solar panel. so while I drive it charges and when parked the solar cell charges it. works as expected ( just don't leave it out in the open, it is not meant for weather, I have mine mounted in the bed up under the rail so it is mostly out of the rain, but does get a little wet sometimes, and still works.

The media could not be loaded. Purchased dec 23. Used for 4 months. Vehicle had mechanical issues and was parked and my campervan build was removed from that vehicle until I recently got another. Plugged it in to new vehicle build and the unit shuts on and off every 5 seconds. Contacted support and they said I’m past the warranty. So realistically if you buy this expect to get 5-6 months out of the unit before it fails and be prepared to warranty it every 6 months. They offered me 25% off another but I’ll be taking my money elsewhere.

Very nice controller, is applying perfect to my system.

This can be used for a wide range of configurations. It can be hooked up to a 12v alternator, solar panels, or both. It's just loose wires, you have to hook them up yourself depending on your situation, but it's nice that the cables are clearly labeled and kindof dummy proof. The housing seems solid and good quality, there was no overheating in my initial tests, my initial impression is very positive.

I bought this for my home made overland trailer. I damaged my first battery overcharging it from the truck on a trip, so this was the smart move. I am happy with the build quality. It feels solid, and has a nice sturdy aluminum shell and heavy duty leads that are clearly labeled. Instalation was straight forward. The solar charger wotks good. Better, i feel than my original. I haven't used it on a long trip as camping season is over for me. But I feel confident this will work well. I'll update my review after I go through a camping season. Hope this helps someone trying to make a decision.

The DC charger part worked great. The solar charging would cut in and out (could see on voltage/amp meter). Now after 14 months, it died and will not turn on.Do not recommend.

I got this because it is literally the only one that doesn't require you to run a d+ (starter) wire. My alternator puts out 13.62 volts and this thing only produces 15.8 amps. When I contact tech support here was there response.The technician said DC input voltage in 14V-16V can be stabilized more than 30A.At 14.4V input it reaches full power output of 40A.If the input voltage is lower than 14V, the power will not reach the rated power.From the picture you sent, the input voltage is 13.62V, so the current is normal at about 20A.Hope this can help you a littleBest regards,LarkI believe by their logic it would not put out 40 amps at 14.4 volts since it only does 15.8 at 13.62. The manual says it puts out 14.4 volts but doesn't say incoming voltage needs to be closer to 15 volts to get that. The manual also says the output is 40 amps with an input of 12.5-16V. All in all unless you turn up you alternator to 15 or more volts don't expect anything close to 40 amps. Seems like a big metal box with a big diode and some circuit that cuts off the output when out put voltage reaches a voltage set point if you can even get it to that point. LION batteries have just over 14 volt max voltage for 100% but if the unit only puts out 13.4 you can't get there unless once again you can get your alternator to put out 15-16 volts.

Installation of this unit following the manual is very easy. It's a good design for simplicity, and most everyone would likely use it exactly as is with no issue. The problem is if you do cold weather activities, and use a diesel truck, this charger will dramatically weaken your starter batteries. In my opinion a voltage sensing relay is a needed to make this perfect. It prevents draining down the starter batteries. It's amperage charge rate is influenced by how much voltage is coming in. You need to have over 14 volts in order to get the full 40 amps, otherwise its charge rate goes down. So if you have 13.5 volts going in your charge rate is only going to be around 30 amps. It's an extremely efficient DC to DC charger. About 96 to 98 percent of the power going in is pushed out to the batteries. Much better than other chargers I've used before. As far as solar goes, it does the job. Get a panel with a VOC or open circuit voltage of 24 volts or under, do not run your panels in series with this charger, only parallel them. I've had 400 watts of solar hooked up to this without issue, it does the job well. Overall I'm happy with the purchase and it's convenient having an all in one solution for solar and alternator charging. Almost forgot, it's a very compact unit and can fit about anywhere you want it to go :)