[RE-wrenches] Charge Control in AC coupled system

Howie Michaelson howie at suncatchervt.com
Thu Oct 28 12:59:36 PDT 2010


Hi All,

I have done several AC coupled off-grid systems using Sunny Islands and
Sunny Boys, but I am now doing one with a dual stacked OB VFX3648 (with a
PSX240 on the Inverter out for load balancing) and a SB3000.  There is
also an existing array that is running through an MX60.  What I am
wondering about is how folks have set up AC coupled string inverters to
best utilize the solar gain while not toasting the batteries.  I'm a big
fan of the tapering control offered by SMA through the frequency shift of
the SI's, but that's not available here.  What relay/contactor setup have
folks found most efficient and safe?  Thanks in advance,

Howie
-- 
Howie Michaelson
NABCEP Certified Solar PV Installer™

Sun Catcher, LLC
Renewable Energy Systems Sales and Service
VT Solar & Wind Incentive Program Partner
http://www.SunCatcherVT.com
(cell) 802-272-0004
(home) 802-439-6096








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