[RE-wrenches] Stacking SW Series

[Steve Higgins]

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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