I can vouch for the grid charger & discharge harness.That's the same grid charger I use, and mine is also set up for discharge. I use a 2-light discharger and use 200 watt lights in both sockets, though.
I was a little more aggressive on the discharge (well, more like ALOT more aggressive) than what Balto suggests, and only discharged/grid charged once, but I did it before Thanksgiving and my IMA system has functioned perfectly since then.
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