[RE-wrenches] Is There an "Off-grid" (i.e. constant voltage) Version of Microinverters?

Sun Apr 17 16:08:56 EDT 2022

I presented a paper several years ago outlining a similar system using one
thermal water heater and comparing it to a PV-based system.  In my tests,
the PV-system outperformed the solar thermal system in energy per square
foot of collector.  There were sometime the Solar Thermal would out
perform at midday and bright sun.  But not for the whole day the PV system
would always win.  The trick was operation of the thermostat, the Cybro
made it possible to use the normal switch.  The other method for switching
was a capacitor across the terminals.

On Sun, Apr 17, 2022 at 1:09 PM Kirk Herander via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Cybo is quite interesting. Makes me want to change my refusal to install
> solar DHW anymore.
>
> On Sun, Apr 17, 2022 at 12:16 PM petertor--- via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> This is great information folks. It looks like Cybo has most of the load
>> scenarios covered.
>>
>> I have one last question before I call them on Monday morning: "Do the
>> Cybo inverters support LiFePO4 batteries? That is, does one of their four
>> DC inputs not only auto-detect batteries but does it recognize LiFePO4 vs.
>> PbAcid? It is my understanding that LiFePO4 batteries need a different
>> charging cycle compared to PbAcid to attain a 100% SOC.
>>
>> - Peter
>>
>> Peter T. Parrish, Ph.D.
>> President, California Solar Engineering
>> 1107 Fair Oaks Blvd Ste. 351
>> South Pasadena, CA 91030
>> (323) 839-6108
>>
>> On 04/16/2022 3:59 PM Darryl Thayer via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>
>> yes, there are three versions of the cybo inverter, the one that I a most
>> familiar with produced a 60 HZ AC signal; the voltage did not exceed 120
>> volts or 240 volts.  The voltage out times the current out was equal to the
>> voltage in times current in.  This allowed me to operate a resistance load,
>> like a water heater.
>>
>> On Sat, Apr 16, 2022 at 2:39 PM Glenn Burt via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>> Take a look at Cybo inverters
>>
>> -Glenn
>> Sent from my 'smart'phone, so please excuse typos and spelling errors.
>>
>> ------ Original message------
>> *From: *petertor--- via RE-wrenches
>> *Date: *Sat, Apr 16, 2022 12:49 PM
>> *To: *re-wrenches at lists.re-wrenches.org;
>> *Cc: *petertor at pobox.com;
>> *Subject:*[RE-wrenches] Is There an "Off-grid" (i.e. constant voltage)
>> Version of Microinverters?
>>
>> It has been a while since I installed a PV system, so I apologize in
>> advance for my ignorance wrt product availability.
>>
>> I recently had need for the off-grid equivalent of a grid-tied
>> microinverter. I have an assortment of new and not so new PV modules such
>> as the Solaria mono, 400 Wp and the Jinko poly, 310 Wp. I would like a
>> microinverter that makes available 120 Vac (or 240 Vac but 120 is
>> preferable), 60 Hz. I would then take the output of these microinverters
>> and combine them in a subpanel. I do not have a need for battery storage.
>>
>> I can explain more about the application to anyone who has an interest.
>>
>> Does such an component exist?
>>
>> Thanks in advance for any help.
>>
>> - Peter
>>
>> Peter T. Parrish, Ph.D.
>> President, California Solar Engineering
>> 1107 Fair Oaks Blvd Ste. 351
>> South Pasadena, CA 91030
>> (323) 839-6108
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>> Peter T. Parrish, Ph.D.
>> President, SolarGnosis
>> 1107 Fair Oaks Blvd Ste. 351
>> South Pasadena, CA 91030
>> (323) 839-6108
>> _______________________________________________
>> List sponsored by Redwood Alliance
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>
> --
>
> *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
>
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