⚡ Charge smarter, travel farther — power your adventure with confidence!
The Renogy 40A DC-DC Battery Charger features dual power input with MPPT solar and alternator compatibility, supporting multiple battery types through adaptive 4-stage charging. It offers comprehensive protection against electrical faults and overheating, easy operation with visual alerts, and is certified to international safety standards with a 2-year warranty, making it an essential upgrade for reliable, efficient battery management on the go.
S**G
Renogy quality
5 stars because was refunded..
S**.
Perfect charging
Got this in the back of my overland vehicle, charging from the unit works first class, small unit very easy to install, looking forward to setting up a solar panel for stationary charging, but so far so good
T**T
No Bluetooth connection possibility
Be aware that many of the reviews here are for a different product. This is a newer product that is cheaper and more compact but does not allow the Bluetooth connection. There is no way to see what is happening with the solar or charging currents etc other than the LED status. Works well as a fit and forget but not as good for those interested in monitoring numbers etc.
P**E
It’s nice
It’s nice thank you
A**R
Important info missing!
No mention of the solar voltage limit in the listing. My panel p creating 33v puts the unit into fault and causes it to be useless. I bought it ages ago so unable to return.Do not buy unless you are certain your panels will not provide over 30v. (Very low)
M**H
Amazing piece of kit
Gone the full Renogy set up and this dc to dc charger and mppt is absolutely quality. For the money it’s hands down cheaper than buying them seperate and with the Bluetooth connection you have everything you need.
S**R
Another great product from Renogy!!
Fantastic charge controller and Dc to Dc charger. No need for multiple charges with this. Solar and dc to dc in one little unit. Also connect the Bluetooth adapter and you get all the info you need. Should highly recommend for a campervan Build.
N**B
Happy I made the change
So far so good, I did have the Renogy 20amp mppt that worked great and kept my 200amph lithium battery in good order. As my fridge started drawing a bit more due to weather and cloudy days I tried a cheap dc to dc charger add on- ones available on Amazon. Even tried the one with didgital display and it was rubbish realy. The dc to dc mppt dose the job nicely. Only thing I would say is the app don’t show battery % just voltage. I know as the voltage drops so dose the capacity but it would be nice to see somthing like the app I had for the BT 1 and mppt. Also I would advise upping your cable size to the max you can as I had issues with my 60amp tripping, the cable was hot also. I dropped the max charge to 40amp and all is good until I up the cable from the 70amp I was advised.
Trustpilot
3 days ago
1 week ago
