[RE-wrenches] 500V "Crowbar"

[Jason Szumlanski]

The EG4 18kPV only handles 26A Imp, but only 31A Isc on MPPT1. That would
not meet the requirement for 32A Isc. The Flexboss21 has the same
limitations (but offers two 26A Imp ports rather than one). The Fortress
version of the 18kPV has a slightly lower Imp limit, and also the max
recommended voltage is only 550V, so that's out, too.

The Sol-Ark 15K is 26A max Imp and 46A Isc on all ports, but it's only 500V.

You might look into the Midnite AIO. The max voltage is 600V. The specs say
30/22/22 for the input current limits to the MPPTs, but does not indicate
if that is operating or Isc. The manual implies that it is the operating
limit, with an Isc limit of 40A. On page 11 of the manual it reads:

"Design for a max input current of 30A MPPT1. The inverter will self-limit
beyond 30A. If current exceeds 40A Isc limit, damage will occur."




Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208


On Mon, Jun 16, 2025 at 6:18 PM jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> The LUX powered 12kw has a 600vdc input with 25 amp limitation on PV 1
>
> Which fits your specifications perfectly.
>
> You can get them under the fortress or EG4 name
>
> jay
>
> On Jun 16, 2025, at 2:41 PM, Travis Knipple via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Hi all,
>
> This is a repeated (rephrased) version of a previous question, but I've
> hit upon a new application.
> I'm looking to retrofit a system from existing SMA Sunny Boy inverters to
> work with an ESS System.
> My PV Array (~900' from the inverters) is 600V Voc, and the strings are
> combined at the Array, so Imp is 24A, Isc is 32A.
> Also, important to note is that 1 of my SB7000 inverters is non functional.
>
> So, my options are:
> (A) A 500V "Crowbar" or SRC type circuit to limit my Voc, and allow me to
> take the array directly to a single MPPT port on a Sol-ark Inverter
> Or, use AC-Coupling to the Sol-Ark, then I can...
> (B) A new PV Inverter that can handle 600V, 32A (Isc) on a single MPPT Port
> (C) A replacement SB7000
> (D) Re-pull my strings of wires to something like a Solis PV Inverter
>
> Does anyone know of either:
> (A) a Voc limiter?
> (B) A PV Inverter with a single MPPT input that can handle 600V, 24A
> (Imp), 32A (Isc)
> or
> (C) A source for a replacement SB7000US
>
> --
> Travis Knipple
> Senior Engineer
> Hudson Solar Solutions LLC
> Rhinebeck, NY 12572
> 518-539-8040 x408 | travis at hudsonsolarsolutions.com
>
> PVIP# PV-111821-013612
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