[RE-wrenches] Code compliant PV wire to an EcoFlow DELTA Pro Ultra Inverter/Charger

[Jason Szumlanski]

I have a client that said she purchased the DPU directly from EcoFlow with
their smart home panel. They sent out a subcontractor from across the
state, who installed the smart panel without a permit, replacing the entire
main distribution panel. The workmanship was passable, but I told her I'm
not touching it until she demands they go back and get a permit.

Here's my plan for these situations... I'm telling people they made a
mistake. I ask them to purchase a single Powerwall 3 with a Gateway 3
installed upstream of the EcoFlow panel, with however many solar panels
they want. If the Powerwall battery is exhausted during an outage, the DPU
will take over with the smart panel. The sun comes up in the morning, the
Powerwall charges and turns on, and the DPU turns off and starts charging
from the Powerwall. The downside is that you need to turn down the charge
rate on the DPU, or the user needs to manage it closely.

At least they get to use their DPU's capacity and get it charged by solar
during a grid outage, albeit indirectly.

These things are simply not made to work within the code framework we have,
and I question their safety. 450V DC flexible cords to a charge controller
on wheels is a recipe for disaster.


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 Tue, Apr 28, 2026 at 4:26 PM Chris Sparadeo <sparadeo.chris at gmail.com>
wrote:

> I echo Jason's frustration with this product's compliance. The DPU has
> been blacklisted by certain AHJs in LA county and I have heard whispers of
> investigations into the validity of this product's UL listing. Previous
> models did not include proper labels or means for emergency shut down of
> the ESS unit. I do not see a code compliant way to integrate solar into
> this unit. Last I checked, EcoFlow was pushing installers and customers to
> avoid permitting and interconnection applications because of its "portable
> nature" but this product is clearly under the purview of NFPA 855. It's a
> mess and I would suggest avoiding the DPU, especially in this specific PV
> integration application.
>
> On Tue, Apr 28, 2026 at 3:59 PM Jason Szumlanski via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> That's not where the problems end. It doesn't have arc fault protection.
>> I get this phone call at least once a week. It's pretty frustrating -
>> people buy these portable units and think we can just slap a couple of
>> panels on the roof, and they're good to go. That's how the marketing makes
>> it sound.
>>
>>
>> https://floridasolardesigngroup.com/ecoflow-delta-pro-ultra-x-not-suitable-for-rooftop-solar
>>
>>
>> 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, Apr 27, 2026 at 1:50 PM Howie Michaelson via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Hi All,
>>> I have a potential client who currently has an EcoFlow DELTA Pro Ultra
>>> <https://www.ecoflow.com/us/delta-pro-ultra> inverter installed in his
>>> house for battery backup.  He wants to install roof-mounted PV. I don't see
>>> how to connect PV into the Inverter/Charger using EMT for code compliance.
>>> Has anyone done something similar?  Can anyone think of a code-compliant
>>> method to bring PV into this setup?
>>>
>>> Howie Michaelson
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