[RE-wrenches] Charge Control in AC coupled system

jay peltz jay at asis.com
Fri Oct 29 08:49:11 PDT 2010


Don't forget that you can use a AC load as well for an AC coupled system.

jay
peltz power


On Oct 28, 2010, at 8:25 PM, Kent Osterberg wrote:

> 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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