Solid state devices have no moving parts, but the early early device constructed of silicon diodes had (have) a relatively high voltage drop and because of that, they get quite hot. Like all mechanical parts in power switching applications, they degrade with use over time. Mechanical parts are cheap, easy to source, and easy to understand. There are benefits and detriments to each style. Generally speaking, if you're trying to manage batteries, you can do it with moving or mechanical parts (solenoids, relays, knife switches), or you can do it with solid state parts (battery isolators, rectifiers). My second comment is in regards to the terminology: people use the term isolator, solenoid, and relay interchangeably and for most of us, it all boils down to the same basic concept.how to manage multiple batteries on a platform where you may have a single source (the alternator), or multiple sources (alternator, solar, shore-power). My first comment: call Odyssey and ask the engineers what they recommend for use with their batteries. So my apologies if this particular topic is redundant. I have looked at quite a few of the other posts but there are too many posts regarding "dual battery" and I have too little time to scan through them all to narrow down to this simple question of which is a better system to go with. I suppose I have one more ancillary question about wiring: on a solenoid, the two large posts are for the (+) positive battery terminals, one small one for ground and the last one? Does that go to the ignition or accessories? Do you have to separate the wires (or separate that black box attached to the positive cable at the battery terminal) from the vehicle to the positive post? On the other hand I've read that Solenoids will fail also. On one one hand I have read that isolators will draw as much as 1 volt from the system (I believe from the accessory battery). Which is better, using an isolator or a solenoid for a dual battery system? I'm now to the point of getting the "things" needed for the install but am confused regarding what "things" to get. One is in my rig and currently being used, but have not had a chance to install the second one yet, so it's still sitting in it's box in the garage. I have two Odyessey PC1200 Batteries that I purchased about 3 months ago for a dual battery set up (in my '98 LC).
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