Friday, Sep 14, 2018 at 22:56
RMS confirmed to me some time ago
"The method of charging the batteries is not really relevant, provided the batteries are maintained in a state of charge that allows the brakes to operate safely and the driver is able to
monitor that state of charge.
- - -
The fact that the trailer
battery or batteries are charged by solar cells rather than by the towing vehicle’s alternator, does not change those requirements."
The Inspector's Bulletin (the only document on the subject) states
"Such trailers, if fitted with electrically actuated braking systems, must be equipped with a device which applies the brakes in the event of a breakaway from the towing vehicle and maintains application for at least fifteen minutes. It is essential therefore, that an energy source, such as a
battery, be carried on the trailer and that means be provided to ensure that the
battery is maintained in a fully energised condition. In this regard, it will be satisfactory if any trailermounted
battery is constantly charged by the towing vehicle and a warning device is fitted to warn the driver (from the normal driving position) if the trailer
battery charge falls to such a level as to render the trailer brakes incapable of meeting the requirements."
Many caravans have their breakaway connected to the house batteries. The only drawback is if the pin is accidentally pulled when you are not there, the batteries will deplete quite quickly.
FollowupID:
893747