[RE-wrenches] Low Frequency transformer off-grid inverter options

[bzp]

Larry.


Hera's an idea. Put a 1:1 isolation transformer of suitable power rating 
between the inverter and load. The iron core will act as a energy 
storage element allowing for a cleaner ac waveform during start.


Frank BZP



On 1/13/2023 12:54 PM, Starlight via RE-wrenches wrote:
> Any new AC equipment connected and running during test? Scope the 
> waveform during equipment start to see if the distortion is severe. I 
> have seen a 300W load make a mess of a Magnum AC waveform.
>
> Larry Crutcher
> Starlight Solar Power Systems
>
>
>
> On Jan 13, 2023, at 11:48 AM, Mac Lewis <maclewis1 at gmail.com> wrote:
>
> Good question Larry,
>
> Rock solid 52V on a lithium battery system. Doesn't appear to be a 
> battery problem at all.
>
> On Fri, Jan 13, 2023, 11:41 AM Starlight <larry at starlightsolar.com> wrote:
>
>     Mac,
>
>     What was the lowest voltage measured at inverter battery terminals
>     during the inrush measurement?
>
>     Larry Crutcher
>     Starlight Solar Power Systems
>
>
>
>     On Jan 13, 2023, at 11:33 AM, Mac Lewis via RE-wrenches
>     <re-wrenches at lists.re-wrenches.org> wrote:
>
>     Hello Wrenches,
>
>     I have a new client that has ran a pretty decent wood shop for
>     about 10 years on a Magnum 4448.  He's got some large loads,
>     planers, saws, compressors vacuums etc.  They are really nice,
>     heavy duty pieces of equipment.  Amazingly, the Magnum has been
>     able to start these loads for the most part for 10 years, but he
>     has reported that it has gotten worse lately (could be a load
>     issue), brown outs, dimming etc
>
>     He wants to upgrade the system, get remote monitoring etc.  I
>     tried a test with a Sol-Ark 12, and it won't start these large
>     motor loads.  I was a little surprised by that but I know they
>     aren't as good as the low freq transformer based inverters at
>     these surges.
>
>     I confirmed that its not just an overload from imbalance because
>     the 240V loads will also overload it.  I got an inrush measurement
>     of 48.5A Ac @240 (but it didn't start the load before Sol-Ark
>     would shut off)
>
>     What are my options?
>     Schneider XW Pro 6848
>     Outback Radian 8048 (Is this a low freq device?)
>     Sunny Islands are beasts but weird to work with and not user friendly
>
>     Any others I should consider?  He does have some significant 120
>     only loads so I don't think the Outback vfxr are a good choice.
>
>     Is it as simple as saying if the Magnum can start this load, the
>     Radian should?
>
>     I appreciate your input!
>
>     --
>     Mac Lewis
>
>     *
>
>
>     *
>     _______________________________________________
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here:http://re-wrenches.org
>
> List Address:RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> There are two list archives for searching. When one doesn't work, try the other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> http://www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> http://www.members.re-wrenches.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20230113/cee22cd6/attachment.htm>