[RE-wrenches] sunny island and lithium

[Gary Handelin]

Jay,
If they want to keep their SI's, a couple of years ago I
successfully replaced an iron Edison battery with 3 Fortress evault
batteries closed loop. Had to update SI firmware and get all evault
batteries to same firmware but it was pretty straight forward. Ran it open
loop for a month or two until I got all the firmware updated. It's off grid
with SB11k for AC coupling. Can share the programming with you if
interested.
Gary

On Tue, Jul 15, 2025 at 12:14 PM jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Thanks William,
>
> Yes it’s AC coupled which I neglected to include.
>
> Given how inexpensive the new inverter gear is, the age of the old stuff
> and seemingly the complication of integration I will propose replacement of
> both inverter and battery.
>
> thanks
>
> jay
>
>
>
>
>
> On Jul 15, 2025, at 8:44 AM, William Miller via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> If the system is AC coupled I would suggest you dump the Sunny Islands
> immediately.
>
> We are soon going to wreck out 4 SIs and install 2 envy 12s. The SIs just
> would not work AC coupled to e-vault 18s.
>
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com
>
>
> On Tue, Jul 15, 2025 at 6:43 AM jay via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> HI All,
>>
>> I might be inheriting a 12 yr old SI off grid system, that has a dying
>> Absolyte battery.
>>
>>
>> I know there have been some discussions on the SI and lithium.
>>
>> I’m just trying to understand what the options are with closed vs open
>> loop, basically can it be done.
>>
>> If I do get the project, I will happily pay someone who’s done all the
>> hard work for the education to tell me what the programming steps are.
>>
>> And at what point does it make sense to just remove the SI and install a
>> AIO?
>>
>> thanks in advance.
>>
>> jay
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