[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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