Rich said:
Scott, why do you say "The only spec which which should mean anything to anybody is how much loss is there through the rectifier." ?
Depending on the implementation requirements, there are a number of significant factors. The voltage drop across switching or isolation mechanism is only one of many factors that need to be dealt with in order to provide an effective solution.
Clearly there are lots of factors when making a decision. An isolator is a one-way valve for electricity. Like eveything engineered, there's always a trade-off.
The solenoid is a mechanical disconnect. The upside is price and simplicity, the downside is it's guaranteed to wear out and become less efficient over time. The silicon rectifier and schottkey rectifier are great because you now have no moving parts when creating the one way valve. No moving parts is generally accepted as a way of increasing product longevity. The downside: there are inherent losses with those components. As an example, the isolator manufactured by Sure Power (
www.mobi-arc.com/comp.jpg) drops essentially one volt at 100a and manifests this in the form of heat which then has to be dissipated. Schottkey units are more effecient, but they are extremely cost prohibitive and drop about half as much as the silicon rectifier which again is dissipated as heat. This lack of efficiency is why most isolators are potted and bonded to three to four pounds of aluminum fins.
Now the MOBI-ISOLATOR, in comparison to the methods I've described, is much more efficient. It will be much smaller. It won't be the most moderately-priced isolator on the market. In our opinion, it's better in many different ways and will carry a price appropriate for such product.
Like anything you guys buy, you'll compare it other things on the market and factor in variables like, price, ease of installation, performance, efficiency, warranty, and application criteria. If you find value in the product, appreciate the engineering that's gone into it, and serves your purposes, then it may be worth considering. If it's not the right fit, if you prefer solenoids or isolators with blue annodized aluminum fins because they look cool, then the MOBI-ISOLATOR may not be the choice for you.
When we've put together a few production units, take pictures, and put together a spec sheet, it'll be available on our website and I'll post it here for those who care.
Again, this information was simply meant as a "heads-up, we've got something cool in the pipeline." We weren't trying to be coy, cause commotion, or use a "non-vendor" thread as a distribution channel. We simply saw "battery isolator" as a topic and thought we'd drop a "heads-up" post.
Scott