[RE-wrenches] Charge Control in AC coupled system
Kent Osterberg
kent at coveoregon.com
Thu Oct 28 20:25:05 PDT 2010
Howie,
In an ac coupled system with Outback inverters you could use a diversion
controller such as a Morningstar Tristar 60 on the dc side. That would
allow using an ac coupled system and a nicely controlled finish charge
for the batteries too. Since there is already a MX60 to do the finish
charge in the system you are considering, a voltage controlled switch,
like the Morningstar relay driver, could simply shut down the SB3000.
Kent Osterberg
Blue Mountain Solar
Howie Michaelson wrote:
> 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
>
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