[RE-wrenches] 1/2 wave loads
Kent
kent at coveoregon.com
Fri Jan 31 10:20:43 PST 2025
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 at 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 at 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 at 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.peltz at 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 at lists.re-wrenches.org> wrote:
>>>>
>>>>
>>>> What is a half wave load?
>>>>
>>>> On Dec 18, 2024 13:35, Jay via RE-wrenches
>>>> <re-wrenches at 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 at 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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