[RE-wrenches] large(ish) AC coupled battery backup

[Dave Tedeyan]

Thanks Darryl,
Yea, it used to be two separate 200A services. At some point, someone
decided to turn one of those panels into a sub and run it all of a single
service.
Regarding paralleling Radians, I know that the max solar input when AC
coupled is only 6kw for an 8kw inverter. When they are paralleled, does
that jump up to a single 12kw input, or are you just limited to two 6kw
inputs?

Cheers,
Dave

*Dave Tedeyan, PE*
Senior Engineer | Taitem Engineering, PC

110 South Albany Street | Ithaca, NY 14850
o. *607.277.1118 x121*  f. 607.277.2119
www.taitem.com

Solar • Sustainability • Energy • Design
B-Corporation Best for the World 2018 Honoree


On Fri, May 3, 2019 at 9:27 AM Darryl Thayer <darylsolar1 at gmail.com> wrote:

> the 2 each 200 Amp panels is to overcome the 42 circuit limit in one
> panel.  must be a big house.  This sounds like a whole house backup.  you
> will need a transfer switch much like a whole house generator switch unless
> your customer needs TOU or some other grid service.
>
> For the AC coupled paralleled Radians or XW6848 and have a turn off for
> one or both of the SB inverters based on battery voltage (SOC).
>
> On Fri, May 3, 2019 at 7:58 AM Dave Tedeyan <dtedeyan at taitem.com> wrote:
>
>> Hi All,
>>
>> Does anyone have a good recommendation for an AC coupled energy storage
>> solution for someone who has a 27.6kw array with two SE11400A-US inverters?
>> The output of one of those inverters is more than a Sonnen or Radian can
>> handle (which is what I am most familiar with).
>> I am not sure yet whether this will be a whole home backup or just a
>> subset of their loads, but they have two 200A panels on a single 200A
>> service.
>>
>> Thanks,
>> Dave
>>
>> *Dave Tedeyan, PE*
>> Senior Engineer | Taitem Engineering, PC
>>
>> 110 South Albany Street | Ithaca, NY 14850
>> o. *607.277.1118 x121*  f. 607.277.2119
>> www.taitem.com
>>
>> Solar • Sustainability • Energy • Design
>> B-Corporation Best for the World 2018 Honoree
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