[RE-wrenches] Stacking SW Series

[William Bryce]

Steve pulled that one out of the old timers closet!  Had forgotten about
“Magic Stack” and the reason it was even a thing!

Firmware issues will not let you stack the SW ‘s as you hope to. Even if
you use a hack and get it done it will not be a reliable setup for a
customer.

On Wed, Jul 15, 2026 at 9:40 AM Steve Higgins via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> To make them stack, they both have to have the same firmware.
> Unfortunately, the SW5548 and the SW+5548 had very different firmware, and
> I don't think you'll be able to connect them up with a SWI/PAR Kit.
>
> You might be able to make them a "Magic Stack" for 120/240, but once you
> lose the generator/grid input, and depending on the loads, the waveforms
> will drift out of phase, and you could get a backfeed.
>
> "Magic Stacking" was when you wired them in 120/240 and used a generator
> or grid power to sync the output waveforms.  That waveform would stay
> synced for quite some time, days if not weeks, as long as you didn't load
> them more than 75%.
>
>
> *Steve Higgins* *⋅* *Technical Services Manager*
> *t* +1.902.597.4020   *m* +1.206.790.5840
> *f* +1.902.597.8447   *e* steve at surrette.com
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> On Tue, Jul 14, 2026 at 8:26 PM Ray Walters via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> I never liked the original SW5548. It had different firmware and actually
>> can't surge as much as an SW4048. The 5548 does have a very heavy
>> transformer, so they would be good for a heavy continuous load that didn't
>> surge much on startup.  They're hard to put up on a wall.
>>
>> I don't know anything about the SW+, I had switched to Outback back
>> then.    Did you read in the SW+ manual that it could be stacked with the
>> SW?  Unless they designed that into it, I'm guessing they wouldn't stack.
>>
>> Ray Walters
>> Remote Solar
>> On 7/14/2026 8:01 PM, All Solar via RE-wrenches wrote:
>>
>> Has anyone tried to stack an SWPlus 5548 with an SW5548?
>> I’m trying to make sure, before I try harder to sell the SWplus
>>
>>
>>
>>
>> Jeremy Rodriguez
>> All Solar Inc.
>> Penrose CO
>> 719-276-4954
>> Established 1998
>>
>> On Wed, Jul 8, 2026 at 8:27 AM All Solar <allsolarpenrose at gmail.com>
>> wrote:
>>
>>> Can anyone tell me if it’s possible to stack an SW Series Inverter with
>>> an SW Plus Series for 120-240V?
>>> What’s Required, if So.
>>>
>>> Thank You
>>>
>>> Jeremy Rodriguez
>>> All Solar Inc.
>>> Penrose CO
>>> 719-276-4954
>>> Established 1998
>>>
>>
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