Kirk,
Unless I remember incorrectly, a single diode gives half wave
rectification, full wave rectification requires two diodes with a
center-tapped transformer or a bridge rectifier. Half wave rectification
injects a dc current on the inverter output; that is why some inverters
don't do well with it.
Kent Osterberg
Blue Mountain Solar
On 1/30/2025 5:59 PM, Kirk Herander via RE-wrenches wrote:
Fortress tells me they just released the latest firmware to deal with
half-wave loads. This version was put out for download a few days ago.
In my case, they say it "might" help (CFL to) LED retrofit lamps from
flickering when switching grid pass-thru to inverter AC. I am dubious.
but I've since read that some LED lamps do not employ full
rectification, just a single diode.
On Thu, Dec 19, 2024 at 8:54 AM Jay via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Hi Howie
That’s great info thanks.
They never mentioned that to me.
And I’ve not heard about an actual
Hardware issue/fix.
The latest firmware 1E1E is supposed to “fix” it. It also requires
a separate firmware update for the display which you have to do in
person, stupid.
Jay
On Dec 18, 2024, at 9:05 PM, Howie Michaelson via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
I installed a couple of EG4 18k inverters off grid this past
spring, made by LuxPower as is the Envy. They look very similar
both visually and programmatically. Withone install, there has
been a steady problem of the inverter shutting off when the
client uses a hair dryer. The other client has not reported any
issues with the inverter cycling off. Tech Support's solution to
this issue which they referred to as stemming from half-wave
loads, was to run another load simultaneously which was supposed
to help prevent the nuisance momentary shutdown, but according to
the client, it hasn't helped. After bugging tech support for
several months about this issue, they finally told me that there
was a hardware design flaw that they were working on resolving
and when they had it fixed, they would send out a replacement
inverter. I asked if they would be replacing both inverters, but
they said since one hasn't reported any issues, they would not be
replacing that one. That was at least 2 months ago, and I have
not heard anything since.
Howie Michaelson
On Wed, Dec 18, 2024 at 4:02 PM Jay via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
I will add that I’ve heard privately off list that it’s
actually smaller loads that seem to be the issue.
And larger 1500 watt electric heaters seem to work ok.
I’m wondering if anyone else has come across this issue and I
guess more importantly is there a fix?
Jay
On Dec 18, 2024, at 1:52 PM, Jay <jay.pe...@gmail.com> wrote:
Here is what I understand 1/2 wave loads to be.
As I understand it, Heater loads are the main issue.
Toasters, toaster ovens, hair dryers, aquarium/terraium
heaters etc.
But if there are other things pls let us know
Jay
On Dec 18, 2024, at 1:34 PM, GLBCC via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
What is a half wave load?
On Dec 18, 2024 13:35, Jay via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Hi all.
I’ve recently been made aware that the fortress
inverter isn’t too happy with 1/2 wave loads.
I’m wondering if this is an issue with the AIO or solark?
Thanks in advance
Jay
--
*Kirk Herander / **kirkh@vermont.solar*
*Owner|Principal, VT Solar, LLC*
*/Celebrating our 34^st Anniversary 1991-2025!!/*
dba Vermont Solar Engineering
802.559.1225
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