Can the D+ ignition cable be connected directly to the positive terminal of a 12V battery instead of an alternator?

In our setup, we have connected the D+ ignition cable to the 12V battery (positive terminal) directly (it is connected to the positive charging cable, which is connected to the 12V battery positive terminal). But, it is important that the connection between the D+ port and the 12V battery has an on/off switch in it, so that charging is only initiated once the engine is running (otherwise you will completely run down your car/RV battery in no time). In summary, (i) have a lead from the D+ ignition port in the DC-to-DC charger to a simple on/off switch, (ii) have a lead from the on/off switch to the positive terminal of the 12V battery (e.g. connect this lead to the positive charging cable); fuse this lead if you think necessary, (iii) connect the positive charging cable to the 12V battery (which will simultaneously connect the D+ lead) and the negative cable to the negative terminal (iv) turn on the engine (and thereby, the alternator) (v) switch the D+ ignition lead switch to ON (green light on DC-to-DC charger should show, indicating charging is underway) When the charging session is finished, just reverse the above steps.

Is this charger suitable for a hybrid vehicle charging 2 caravan batteries?

There should be no reason why you can't. I would download the manual from renogy as this will give you a better idea. You will have to feed from your car battery and also feed a d+ from your ignition or alternator to the charger. Hope this helps.

will this unit work for a smart alternator which run at a lower voltage

Specify what a "low" voltage...

Does this come with a warranty

Euro zone to euro zone 6 years (seriously, check for yourself) outside EU is 12months I believe.

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🔌 Power Up Your Adventures!

ULTRA SAFETY FEATURES - Equipped with Over-voltage, Over-temperature, and Reverse Polarity protections.
SMART 3 STAGE CHARGING - Optimizes charging with Bulk, Boost, and Float stages for maximum efficiency.
COMPACT ROBUST DESIGN - CE certified for reliability in all conditions, perfect for RVs and boats.
STARTER BATTERY PROTECTION - Prevents over-discharge of the starter battery, ensuring longevity.
CHARGE MULTIPLE BATTERY TYPES - Compatible with AGM, Flooded, Gel, and Lithium batteries for versatile use.

The Renogy 12V 60A DC to DC On-Board Battery Charger is engineered for versatility, supporting various battery types including AGM, Flooded, Gel, and Lithium. With its smart 3-stage charging system, it ensures optimal battery health and safety through multiple protective features, making it an essential companion for RVs, commercial vehicles, and marine applications.

Reviews

D**E

A true upgrade.

I live on a narrowboat and depend on something to charge my domestic batteries in winter. This replaced my previous Renogy DC-DC which had served me well, despite being a rebranded unit and wildly inefficient.This one is so much easier to install, with the voltage sensing functionality and appears to be far more efficient, drawing less power to charge more effectively. Easy to set up wit the one button function.My only frustration is the same as most Renogy products, the Bluetooth is a separate purchase.

8.07.2025

A**R

Battery to battery charger

Excellent item easy to set up and working very well

8.05.2025

A**T

Great piece of kit

Great piece of kitEasy to installSpeedy delivery

1.05.2025

H**F

USELESS JUNK

This 40 Amp DC charger works for a few seconds at a time, delivering less than half an Amp. Customer service from Renogy is insultingly bad - they just ignore you for weeks on end and simply refuse to do anything while still claiming they are trying their best to solve the problem.Avoid like the plague.

20.07.2024

S**N

Great bit of kit.

Arrived quickly and works great. Make sure to use mega or nano fuses as the resettable one I first tried led me to think the charger was faulty as it was only allowing 3.5amps through it. Bypassed the fuse and it was then working perfectly at outputting the full 60amps.

30.08.2024

B**L

Dc to dc charger

Lost points on instructions. But dose a really good job of charging the liesure batteries. Can't just connect negative to anywhere. I need to run in another negative. Cable to front of van is picks up a feed from itself and keeps charging, until turned off then starts again as soon as van started. Not great at wire sizing. As information hard to find. I just used 16mm cable a bit of over kill.

22.03.2025

A**N

Brilliant

Works as it should. Easy to install. Great!

22.07.2024

E**N

thank you

25.10.2024

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Item Weight	2.81 Kilograms
Item Dimensions D x W x H	31D x 6.8W x 17H centimetres
Colour	Black
Energy Specifications Standard	CE
Battery Charge Time	3 Hours
Current Rating	60 Amps
Input Voltage	12 Volts
Output Voltage	12 Volts

Renogy12V 60A DC to DC On-Board Battery Charger for Flooded, Gel, AGM, and Lithium Batteries, Using Multi-stage Charging in RVs, Commercial Vehicles, Boats, Yachts

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