I've been thinking - but not too hard - about a hybrid system. The electrical system on a modern tow vehicle will not allow the trailer battery to backfeed into the tow vehicle's battery.Īs said above, a hybrid system may work better. You just have to use a small enough charger to not overload your vehicle wiring. While starting your battery and the few seconds after you start your tow vehicle, the lithium battery can feed back to the starting battery until the alternator kicks in.īest solution in my opinion is to use a DC-DC charger in the trailer between the trailer connector and your lithium battery. Power can also flow the other way as well. ![]() Once the starting battery reaches the float stage, you will get a very minimal amount of charging to your lithium battery. Typically, when you start your vehicle and your alternator is charging the starting battery, you will get some charging to your lithium battery while the alternator is outputting at bulk or absorption voltage. This wire will not charge your lithium battery well. You need to have a way to ensure that your trailer battery is staying charged and it may be required by law. The battery in your trailer should be tied to the break-away cable to activate your trailer brakes in the event that the trailer becomes disconnected. If you have trailer brakes, you should not just disconnect this wire. This is not a very impressive solution in my opinion but it is very common. ![]() Many trailer manufacturer's install an automatic reset 30amp breaker on the trailer to prevent pulling more than 30amps when you have a dead battery in either your tow vehicle or the trailer. This wire is typically used to keep the trailers battery charged while driving. I wouldn't recommend more than 20amps through this wire though. ![]() It is typically either fused at 30 or 40amps. The 12V power wire in the 7-way plug should be connected to the tow vehicles battery.
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