[RE-wrenches] Fortress Envy CTs on 200 amp wire

[William Miller]

This install is an eRnvy 8. It comes with a 100 amp/100mA CTs.

That ratio is 1000/1. The CT you show is a 300/1. They are therefore not
interchangeable.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com

On Wed, May 6, 2026 at 10:58 AM Kirk Herander via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> The last 12 Kw envy I installed, two months ago, came with a 300 amp
> rating printed right on the CT’s. I can vouch for the fact they fit across
> 4/0 wire with room to spare.
>
>
>
> *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
>
> *Owner|Principal, VT Solar, LLC*
>
> *Celebrating our 35th Anniversary 1991-2026!!*
>
> dba Vermont Solar Engineering
>
> 802.559.1225
>
> On Wed, May 6, 2026 at 12:48 PM Dana Orzel via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> The included CTs are good for about 100amp wire. I did a search for a
>> compatible CT for 200 amp & found it months ago but cannot recall where. I
>> would contact Fortress.
>>
>>
>>
>> Good time for this Question: are CTs compatible across the board inverter
>> to inverter? Is a 200amp CT for one inverter OK on another inverter?
>>
>>
>>
>> _________________________________________________________
>>
>> Dana Orzel                GREAT SOLAR WORKS!
>>
>> C – 208.721.7003      E – dana at solarwork.com
>>
>> W - www. greatsolarworks.com     www.solarwork.com
>>
>> *“Responsible Technologies for Responsible People since 1988!”*
>>
>>
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: William Miller via RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> Cc: William Miller <william at millersolar.com>
>> Bcc:
>> Date: Tue, 5 May 2026 20:02:33 +0000
>> Subject: [RE-wrenches] Fortress Envy CTs on 200 amp wire
>> Friends:
>>
>> The included CTs are too small. Anyone else face this problem?
>>
>> TIA.
>>
>>
>> William Miller
>> Miller Solar.com
>> 805-438-5600
>> www.millersolar.com
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