I didn't watch the whole thing, but it looked like a standard AC couple
set up with an Outback Radian. My understanding is that Outback no
longer supports AC Coupling, BTW. I would never use that for an off
grid system or for longer outages. In a very brief explanation, it
essentially bypasses any charge controlling to the batteries, and puts
full Array power into the batteries until a relay (or phase shifting)
disconnects the array. No three stage charging, no taper charging, no
float, no temp compensation. Its like trying to fill a 5 gal bucket
with a fire house, or drive a car with a throttle that's either off or
at full throttle, no in between. The other issue is that if the
batteries get low and the inverter shuts off, the system will not
recharge, and after a couple of weeks the batteries will be sulfated
beyond recovery.
My guess is that manus that advocated this approach got into trouble
from end users that fried expensive battery banks during longer
outages. I would consider it the equivalent of cheap backup generators:
a great backup system for folks that don't need it. There are probably
thousands of those out there with happy customers and installers,
because its never actually been used for more than a few hours, and the
batteries are properly charged from the grid 99.8% of the time.
Ray Walters
Remote Solar
303 505-8760
On 9/12/18 6:11 PM, Ken Schaal wrote:
https://www.youtube.com/watch?v=eyhkIfS5Z-Q
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