[RE-wrenches] off-grid AC coupling feasibility

[Jason Szumlanski]

Hi Kirk,

I have not done this personally, and this does not pertain to your specific
situation, but related to this subject is the Sol-Ark 15k has a massive AC
coupling capability even with maximum DC connected PV. I really like this
idea for people that want a huge PV array but only need the continuous AC
output of a single inverter. You lose some redundancy compared to dual
inverters, but this could be a cost effective strategy. Mixing DC and AC
coupling does have its advantages.

Jason Szumlanski




On Sat, Jul 30, 2022 at 12:31 PM Kirk Herander via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> All,
> Anyone out there successfully AC-coupled inverters in an off-grid system?
> Advantages vs. pitfalls?
>
> In my case I'm thinking of its practicality with a Solaredge inverter
> AC-coupled to an OB Radian inverter. OB firmware makes this pretty easy
> now. So effectively the Radian is always operating in a grid-backup mode.
>
> I already upgraded the system to the Radian, and soon to add 5kw of
> pole-mounted PV(currently only 1.8kw of 22-year old PV on the roof). This
> system also just got 16kwh of Blue Ion LFP batteries.
>
> This is a last-minute thought I have instead of investing in additional DC
> charge controllers for the new array.
> Cost-wise there's not much of a difference between several high-quality
> charge controllers and a smaller SE inverter w/optimisers. Thanks.
>
> --
>
> *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
>
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>
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