Just wanted to find out what us the major difference between the 2. I know one is bi-directional but is there a benefit of having one over the other? I am planning on using one for my 2 battery set up and wanted to find out which one is better to use. Seems like most people use the 1314. <BR>Thanks

Your alternator only charges one of the batteries so the 1314 is fine. <BR> <BR>Might only be beneficial if you for some reason you hook up a battery maintainer to the other battery...otherwise just put it on the main battery.

You can use either. Most of the one's I have sold have been the 1314 but either will work. <BR> <BR>Here is a good explanation of how it works. This is for the 200 amp versions but they work the same. <BR> <BR>"Yesterday I received my replacement sure power. They actually sent me the 1315-200 instead of the 1314-200. All that means is that this unit will connect both batteries as long as the main or aux see a voltage over 13.2V. For example, the unit will connect with the engine running (alternator is providing the charge) or if I connect a battery charger to the spare battery. The 1314-200 will only connect if the main battery sees a voltage over 13.2V. They call it bi directional (1315-XXX) unit as opposed to a uni-directional (1314-XXX) unit. Hope this makes sense.)

Makes sense, but is there an advantage of having one over the other? A guy I know has a 1315 he wants to sell cheap since he wants the 1314. Just don't want to get stuck with something that may cause issues.