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No matter what Xantrex says, if you're gonna use an EchoCharge, I'd disconnect the second "channel" (i.e., the 2nd red wire from the charger).
It's not a question of how much amperage; it's a question of flow control (or "interaction" as you correctly surmised at the beginning).
The EchoCharge is built exactly for what you wanna do. The charger's 2nd channel likely isn't as "smart". Leaving it connected could fool the EchoCharge into thinking the battery is at a higher level of charge than it really is.
Without getting to a real design engineer familiar with that particular charger (and where do you find one at Xantrex these days?), I'd opt for the "clean" solution rather than trust to what someone told you over the phone.
Last edited by btrayfors; 09-09-2008 at 04:26 PM.