Re: [RE-wrenches] AC Coupled Enphase

2017-08-30 Thread b...@midnitesolar.com 

On 8/30/2017 5:54 AM, Drake wrote:

Hi boB,

Would there be any issues with delayed control of the microinverters? 
We do  plan to  use disconnects for maintenance.


Thanks,

Drake




I highly doubt there would be enough delay to worry about anything 
regarding battery damage


Even with Rule 21 or its cousins in a normal home installation.

boB







At 06:27 PM 8/29/2017, you wrote:

Content-Type: multipart/alternative;
 boundary="155C815B9802686293824DDD"
Content-Language: en-US


SSRs, especially AC SSRs made from thyrisotrs (scrs and/or triacs)Â 
are "leaky" in general


so when turned OFF, can cause a shock  Maybe not enough to kill 
you but maybe enough


to make you fall off the roof !

I'm not sure why the disconnects aren't good enough which should 
already be in place ?


boB

On 8/29/2017 4:53 AM, Jason Szumlanski wrote:
My vote would still be to use two single pole relays as suggested 
previously to kill each leg. That way you build in redundancy and 
dropping either leg will do the trick. In fact, it sounds like this 
would be even better than a two pole relay for the redundancy reason.


The other factor is whether you are using NO or NC relays. My 
engineer requires NO relays in these cases so they would fail in the 
open position only. I'm not sure how this would work, or if it would 
work with solid state relays. I have never dug into this. My 
understanding is that solid state relays fail in the closed 
condition (shorted). This would preclude their use in a situation 
where opening the circuit is the preferred failure mode. Maybe 
someone with some more knowledge in this area can chime in on 
whether SSRs are a good idea in this scenario.


Jason Szumlanski


On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil 
mailto:nsol...@enphaseenergy.com>> wrote:


The one-pole relay will work for de-energizing any of the
Enphase microinverters.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937 

On Aug 28, 2017, at 6:03 PM, Drake
mailto:drake.chamber...@redwoodalliance.org>> wrote:


Hi Nick,

I should mention that the inverters being AC coupled are
M-250s, not the new IQ series. Would that make any difference?

Thanks,


Drake


At 03:12 PM 8/28/2017, Drake wrote:

Hi Nick,


At 11:20 AM 8/28/2017, you wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
       Â

boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"

You can use a one-pole relay.  We show one-pole
switching in our zero-export, self-consumption
doc for PEL applications.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937 

On Aug 28, 2017, at 6:44 AM, Drake
mailto:drake.chamber...@redwoodalliance.org>> wrote:


Hello Wrenches,

I am going to AC couple some Enphase
inverters and found some really nice solid
state, single pole relays to control them
with. Enphase says I must use 2 pole relays
for the control current even though the
disconnects will turn off all power for
maintenance.

Enphase claims that the inverters will not
shut down reliably with only one line
opened. This does not make sense to me in
view of UL 1741. Is Enphase correct in their
claim, or are there other reasons that both
poles need to be opened

I want to use the solid state relays because
the coil voltage is between 3 and 32 volts.
This would avoid the need to add voltage
dropping series resistors to protect the
coil for higher battery voltages.

Alternatively, does anyone know of
reasonably priced, 2 pole solid state relays?

Thanks,

Drake

Â
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328 

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-30 Thread Drake 

Hi boB,

Would there be any issues with delayed control of 
the microinverters? We do  plan to  use disconnects for maintenance.


Thanks,

Drake

At 06:27 PM 8/29/2017, you wrote:

Content-Type: multipart/alternative;
 boundary="155C815B9802686293824DDD"
Content-Language: en-US


SSRs, especially AC SSRs made from thyrisotrs 
(scrs and/or triacs)Â  are "leaky" in general


so when turned OFF, can cause a 
shock  Maybe not enough to kill you but maybe enough


to make you fall off the roof !

I'm not sure why the disconnects aren't good 
enough which should already be in place ?


boB

On 8/29/2017 4:53 AM, Jason Szumlanski wrote:
My vote would still be to use two single pole 
relays as suggested previously to kill each 
leg. That way you build in redundancy and 
dropping either leg will do the trick. In fact, 
it sounds like this would be even better than a 
two pole relay for the redundancy reason.


The other factor is whether you are using NO or 
NC relays. My engineer requires NO relays in 
these cases so they would fail in the open 
position only. I'm not sure how this would 
work, or if it would work with solid state 
relays. I have never dug into this. My 
understanding is that solid state relays fail 
in the closed condition (shorted). This would 
preclude their use in a situation where opening 
the circuit is the preferred failure mode. 
Maybe someone with some more knowledge in this 
area can chime in on whether SSRs are a good idea in this scenario.


Jason Szumlanski


On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil 
<nsol...@enphaseenergy.com> wrote:
The one-pole relay will work for de-energizing 
any of the Enphase microinverters.


Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:03 PM, Drake 
<drake.chamber...@redwoodalliance.org> 
wrote:



Hi Nick,

I should mention that the inverters being AC 
coupled are M-250s, not the new IQ series. Would that make any difference?


Thanks,


Drake


At 03:12 PM 8/28/2017, Drake wrote:

Hi Nick,


At 11:20 AM 8/28/2017, you wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
       
  boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"


You can use a one-pole relay.  We show 
one-pole switching in our zero-export, 
self-consumption doc for PEL applications.


Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:44 AM, Drake 
< drake.chamber...@redwoodalliance.org> wrote:



Hello Wrenches,

I am going to AC couple some Enphase 
inverters and found some really nice solid 
state, single pole relays to control them 
with. Enphase says I must use 2 pole relays 
for the control current even though the 
disconnects will turn off all power for maintenance.


Enphase claims that the inverters will not 
shut down reliably with only one line 
opened. This does not make sense to me in 
view of UL 1741. Is Enphase correct in 
their claim, or are there other reasons that both poles need to be opened


I want to use the solid state relays 
because the coil voltage is between 3 and 
32 volts. This would avoid the need to add 
voltage dropping series resistors to 
protect the coil for higher battery voltages.


Alternatively, does anyone know of 
reasonably priced, 2 pole solid state relays?


Thanks,

Drake

Â
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-29 Thread b...@midnitesolar.com 


SSRs, especially AC SSRs made from thyrisotrs (scrs and/or triacs)  are 
"leaky" in general


so when turned OFF, can cause a shock  Maybe not enough to kill you 
but maybe enough


to make you fall off the roof !

I'm not sure why the disconnects aren't good enough which should already 
be in place ?


boB


On 8/29/2017 4:53 AM, Jason Szumlanski wrote:
My vote would still be to use two single pole relays as suggested 
previously to kill each leg. That way you build in redundancy and 
dropping either leg will do the trick. In fact, it sounds like this 
would be even better than a two pole relay for the redundancy reason.


The other factor is whether you are using NO or NC relays. My engineer 
requires NO relays in these cases so they would fail in the open 
position only. I'm not sure how this would work, or if it would work 
with solid state relays. I have never dug into this. My understanding 
is that solid state relays fail in the closed condition (shorted). 
This would preclude their use in a situation where opening the circuit 
is the preferred failure mode. Maybe someone with some more knowledge 
in this area can chime in on whether SSRs are a good idea in this 
scenario.


Jason Szumlanski


On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil 
mailto:nsol...@enphaseenergy.com>> wrote:


The one-pole relay will work for de-energizing any of the Enphase
microinverters.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937 

On Aug 28, 2017, at 6:03 PM, Drake
mailto:drake.chamber...@redwoodalliance.org>> wrote:


Hi Nick,

I should mention that the inverters being AC coupled are M-250s,
not the new IQ series. Would that make any difference?

Thanks,


Drake


At 03:12 PM 8/28/2017, Drake wrote:

Hi Nick,


At 11:20 AM 8/28/2017, you wrote:

Content-Language: en-US
Content-Type: multipart/alternative;

boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"

You can use a one-pole relay.  We show one-pole switching in
our zero-export, self-consumption doc for PEL applications.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937 

On Aug 28, 2017, at 6:44 AM, Drake
mailto:drake.chamber...@redwoodalliance.org>> wrote:


Hello Wrenches,

I am going to AC couple some Enphase inverters and found some
really nice solid state, single pole relays to control them
with. Enphase says I must use 2 pole relays for the control
current even though the disconnects will turn off all power
for maintenance.

Enphase claims that the inverters will not shut down reliably
with only one line opened. This does not make sense to me in
view of UL 1741. Is Enphase correct in their claim, or are
there other reasons that both poles need to be opened

I want to use the solid state relays because the coil voltage
is between 3 and 32 volts. This would avoid the need to add
voltage dropping series resistors to protect the coil for
higher battery voltages.

Alternatively, does anyone know of reasonably priced, 2 pole
solid state relays?

Thanks,

Drake


Drake Chamberlin
/Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328 

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-29 Thread Dave Angelini Offgrid Solar 
Probably a good idea to test that HBCO is set right, actually does shut
down the inverter, and stays programmed correctly in a LBCO or complete
drain of battery.


Dave DrakeDave
> The plan is to use N/C relays. As this is in a
> backup system, N/O relays would need to spend
> most of their lives energized. The relays will
> not be able to receive any control power while the grid is up.
>
> If all else fails and the relays stay closed and
> overcharge the batteries, the high voltage
> disconnect of the Magnum inverter should shut the
> system down before it becomes hazardous.
>
> Drake
>
> At 07:53 AM 8/29/2017, you wrote:
>>My vote would still be to use two single pole
>>relays as suggested previously to kill each leg.
>>That way you build in redundancy and dropping
>>either leg will do the trick. In fact, it sounds
>>like this would be even better than a two pole relay for the redundancy
>> reason.
>>
>>The other factor is whether you are using NO or
>>NC relays. My engineer requires NO relays in
>>these cases so they would fail in the open
>>position only. I'm not sure how this would work,
>>or if it would work with solid state relays. I
>>have never dug into this. My understanding is
>>that solid state relays fail in the closed
>>condition (shorted). This would preclude their
>>use in a situation where opening the circuit is
>>the preferred failure mode. Maybe someone with
>>some more knowledge in this area can chime in on
>>whether SSRs are a good idea in this scenario.
>>
>>Jason Szumlanski
>>
>>
>>On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil
>><nsol...@enphaseenergy.com> wrote:
>>The one-pole relay will work for de-energizing
>>any of the Enphase microinverters.
>>
>>Nick Soleil
>>Field Application Engineer
>>Enphase Energy
>>Cell: 707-321-2937
>>
>>On Aug 28, 2017, at 6:03 PM, Drake
>><drake.chamber...@redwoodalliance.org>
>>wrote:
>>
>>>Hi Nick,
>>>
>>>I should mention that the inverters being AC
>>>coupled are M-250s, not the new IQ series. Would that make any
>>> difference?
>>>
>>>Thanks,
>>>
>>>
>>>Drake
>>>
>>>
>>>At 03:12 PM 8/28/2017, Drake wrote:
Hi Nick,


At 11:20 AM 8/28/2017, you wrote:
>Content-Language: en-US
>Content-Type: multipart/alternative;
>Â Â Â Â Â Â Â
>Â  boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"
>
>You can use a one-pole relay.  We show
>one-pole switching in our zero-export,
>self-consumption doc for PEL applications.
>
>Nick Soleil
>Field Application Engineer
>Enphase Energy
>Cell: 707-321-2937
>
>On Aug 28, 2017, at 6:44 AM, Drake
><
>  drake.chamber...@redwoodalliance.org> wrote:
>
>>Hello Wrenches,
>>
>>I am going to AC couple some Enphase
>>inverters and found some really nice solid
>>state, single pole relays to control them
>>with. Enphase says I must use 2 pole relays
>>for the control current even though the
>>disconnects will turn off all power for maintenance.
>>
>>Enphase claims that the inverters will not
>>shut down reliably with only one line
>>opened. This does not make sense to me in
>>view of UL 1741. Is Enphase correct in their
>>claim, or are there other reasons that both poles need to be opened
>>
>>I want to use the solid state relays because
>>the coil voltage is between 3 and 32 volts.
>>This would avoid the need to add voltage
>>dropping series resistors to protect the coil for higher battery
>> voltages.
>>
>>Alternatively, does anyone know of
>>reasonably priced, 2 pole solid state relays?
>>
>>Thanks,
>>
>>Drake
>>
>>Â
>>Drake Chamberlin
>>Athens Electric LLC
>>OH License 44810
>>CO License 3773
>>NABCEP Certified Solar PV
>>740-448-7328
>>
>>___
>>List sponsored by Redwood Alliance
>>
>>List Address:
>>RE-wrenches@lists.re-wrenches.org
>>
>>Change listserver email address & settings:
>>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
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>>
>>
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Re: [RE-wrenches] AC Coupled Enphase

2017-08-29 Thread Drake 
The plan is to use N/C relays. As this is in a 
backup system, N/O relays would need to spend 
most of their lives energized. The relays will 
not be able to receive any control power while the grid is up.


If all else fails and the relays stay closed and 
overcharge the batteries, the high voltage 
disconnect of the Magnum inverter should shut the 
system down before it becomes hazardous.


Drake

At 07:53 AM 8/29/2017, you wrote:
My vote would still be to use two single pole 
relays as suggested previously to kill each leg. 
That way you build in redundancy and dropping 
either leg will do the trick. In fact, it sounds 
like this would be even better than a two pole relay for the redundancy reason.


The other factor is whether you are using NO or 
NC relays. My engineer requires NO relays in 
these cases so they would fail in the open 
position only. I'm not sure how this would work, 
or if it would work with solid state relays. I 
have never dug into this. My understanding is 
that solid state relays fail in the closed 
condition (shorted). This would preclude their 
use in a situation where opening the circuit is 
the preferred failure mode. Maybe someone with 
some more knowledge in this area can chime in on 
whether SSRs are a good idea in this scenario.


Jason Szumlanski


On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil 
<nsol...@enphaseenergy.com> wrote:
The one-pole relay will work for de-energizing 
any of the Enphase microinverters.


Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:03 PM, Drake 
<drake.chamber...@redwoodalliance.org> 
wrote:



Hi Nick,

I should mention that the inverters being AC 
coupled are M-250s, not the new IQ series. Would that make any difference?


Thanks,


Drake


At 03:12 PM 8/28/2017, Drake wrote:

Hi Nick,


At 11:20 AM 8/28/2017, you wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
       
  boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"


You can use a one-pole relay.  We show 
one-pole switching in our zero-export, 
self-consumption doc for PEL applications.


Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:44 AM, Drake 
< 
 drake.chamber...@redwoodalliance.org> wrote:



Hello Wrenches,

I am going to AC couple some Enphase 
inverters and found some really nice solid 
state, single pole relays to control them 
with. Enphase says I must use 2 pole relays 
for the control current even though the 
disconnects will turn off all power for maintenance.


Enphase claims that the inverters will not 
shut down reliably with only one line 
opened. This does not make sense to me in 
view of UL 1741. Is Enphase correct in their 
claim, or are there other reasons that both poles need to be opened


I want to use the solid state relays because 
the coil voltage is between 3 and 32 volts. 
This would avoid the need to add voltage 
dropping series resistors to protect the coil for higher battery voltages.


Alternatively, does anyone know of 
reasonably priced, 2 pole solid state relays?


Thanks,

Drake

Â
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-29 Thread Jason Szumlanski 
My vote would still be to use two single pole relays as suggested
previously to kill each leg. That way you build in redundancy and dropping
either leg will do the trick. In fact, it sounds like this would be even
better than a two pole relay for the redundancy reason.

The other factor is whether you are using NO or NC relays. My engineer
requires NO relays in these cases so they would fail in the open position
only. I'm not sure how this would work, or if it would work with solid
state relays. I have never dug into this. My understanding is that solid
state relays fail in the closed condition (shorted). This would preclude
their use in a situation where opening the circuit is the preferred failure
mode. Maybe someone with some more knowledge in this area can chime in on
whether SSRs are a good idea in this scenario.

Jason Szumlanski


On Mon, Aug 28, 2017 at 10:19 PM, Nick Soleil 
wrote:

> The one-pole relay will work for de-energizing any of the Enphase
> microinverters.
>
> Nick Soleil
> Field Application Engineer
> Enphase Energy
> Cell: 707-321-2937 <(707)%20321-2937>
>
> On Aug 28, 2017, at 6:03 PM, Drake 
> wrote:
>
> Hi Nick,
>
> I should mention that the inverters being AC coupled are M-250s, not the
> new IQ series. Would that make any difference?
>
> Thanks,
>
>
> Drake
>
>
> At 03:12 PM 8/28/2017, Drake wrote:
>
> Hi Nick,
>
>
> At 11:20 AM 8/28/2017, you wrote:
>
> Content-Language: en-US
> Content-Type: multipart/alternative;
>  boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"
>
> You can use a one-pole relay.  We show one-pole switching in our
> zero-export, self-consumption doc for PEL applications.
>
> Nick Soleil
> Field Application Engineer
> Enphase Energy
> Cell: 707-321-2937 <(707)%20321-2937>
>
> On Aug 28, 2017, at 6:44 AM, Drake < drake.chamber...@redwoodalliance.org>
> wrote:
>
> Hello Wrenches,
>
> I am going to AC couple some Enphase inverters and found some really nice
> solid state, single pole relays to control them with. Enphase says I must
> use 2 pole relays for the control current even though the disconnects will
> turn off all power for maintenance.
>
> Enphase claims that the inverters will not shut down reliably with only
> one line opened. This does not make sense to me in view of UL 1741. Is
> Enphase correct in their claim, or are there other reasons that both poles
> need to be opened
>
> I want to use the solid state relays because the coil voltage is between 3
> and 32 volts. This would avoid the need to add voltage dropping series
> resistors to protect the coil for higher battery voltages.
>
> Alternatively, does anyone know of reasonably priced, 2 pole solid state
> relays?
>
> Thanks,
>
> Drake
>
>
> Drake Chamberlin
>
>
>
>
>
>
> *Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified
> Solar PV 740-448-7328 <(740)%20448-7328> *__
> _
> List sponsored by Redwood Alliance
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> org/maillist.html
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Re: [RE-wrenches] AC Coupled Enphase

2017-08-28 Thread Nick Soleil 
The one-pole relay will work for de-energizing any of the Enphase 
microinverters.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:03 PM, Drake 
mailto:drake.chamber...@redwoodalliance.org>>
 wrote:

Hi Nick,

I should mention that the inverters being AC coupled are M-250s, not the new IQ 
series. Would that make any difference?

Thanks,


Drake


At 03:12 PM 8/28/2017, Drake wrote:
Hi Nick,


At 11:20 AM 8/28/2017, you wrote:
Content-Language: en-US
Content-Type: multipart/alternative;
 boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"

You can use a one-pole relay.  We show one-pole switching in our zero-export, 
self-consumption doc for PEL applications.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:44 AM, Drake < 
drake.chamber...@redwoodalliance.org>
 wrote:

Hello Wrenches,

I am going to AC couple some Enphase inverters and found some really nice solid 
state, single pole relays to control them with. Enphase says I must use 2 pole 
relays for the control current even though the disconnects will turn off all 
power for maintenance.

Enphase claims that the inverters will not shut down reliably with only one 
line opened. This does not make sense to me in view of UL 1741. Is Enphase 
correct in their claim, or are there other reasons that both poles need to be 
opened

I want to use the solid state relays because the coil voltage is between 3 and 
32 volts. This would avoid the need to add voltage dropping series resistors to 
protect the coil for higher battery voltages.

Alternatively, does anyone know of reasonably priced, 2 pole solid state relays?

Thanks,

Drake


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-28 Thread Drake 

Hi Nick,

I should mention that the inverters being AC coupled are M-250s, not 
the new IQ series. Would that make any difference?


Thanks,


Drake


At 03:12 PM 8/28/2017, Drake wrote:

Hi Nick,


At 11:20 AM 8/28/2017, you wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"

You can use a one-pole relay.  We show one-pole switching in our 
zero-export, self-consumption doc for PEL applications.


Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:44 AM, Drake 
< 
drake.chamber...@redwoodalliance.org> wrote:



Hello Wrenches,

I am going to AC couple some Enphase inverters and found some 
really nice solid state, single pole relays to control them with. 
Enphase says I must use 2 pole relays for the control current even 
though the disconnects will turn off all power for maintenance.


Enphase claims that the inverters will not shut down reliably with 
only one line opened. This does not make sense to me in view of UL 
1741. Is Enphase correct in their claim, or are there other 
reasons that both poles need to be opened


I want to use the solid state relays because the coil voltage is 
between 3 and 32 volts. This would avoid the need to add voltage 
dropping series resistors to protect the coil for higher battery voltages.


Alternatively, does anyone know of reasonably priced, 2 pole solid 
state relays?


Thanks,

Drake


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-28 Thread Drake 

Hi Nick,

That is very good news. I just hit the wall trying to find 2 pole 
solid state N/C relays.  I was trying to decide whether to go back to 
mechanical or buy double the amount of single pole relays.


Thanks,

Drake

At 11:20 AM 8/28/2017, you wrote:

Content-Language: en-US
Content-Type: multipart/alternative;
boundary="_000_56449940CA694DDAABB811FCC45A2070enphaseenergycom_"

You can use a one-pole relay.  We show one-pole switching in our 
zero-export, self-consumption doc for PEL applications.


Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:44 AM, Drake 
<drake.chamber...@redwoodalliance.org> 
wrote:



Hello Wrenches,

I am going to AC couple some Enphase inverters and found some 
really nice solid state, single pole relays to control them with. 
Enphase says I must use 2 pole relays for the control current even 
though the disconnects will turn off all power for maintenance.


Enphase claims that the inverters will not shut down reliably with 
only one line opened. This does not make sense to me in view of UL 
1741. Is Enphase correct in their claim, or are there other reasons 
that both poles need to be opened


I want to use the solid state relays because the coil voltage is 
between 3 and 32 volts. This would avoid the need to add voltage 
dropping series resistors to protect the coil for higher battery voltages.


Alternatively, does anyone know of reasonably priced, 2 pole solid 
state relays?


Thanks,

Drake


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-28 Thread Nick Soleil 
You can use a one-pole relay.  We show one-pole switching in our zero-export, 
self-consumption doc for PEL applications.

Nick Soleil
Field Application Engineer
Enphase Energy
Cell: 707-321-2937

On Aug 28, 2017, at 6:44 AM, Drake 
mailto:drake.chamber...@redwoodalliance.org>>
 wrote:

Hello Wrenches,

I am going to AC couple some Enphase inverters and found some really nice solid 
state, single pole relays to control them with. Enphase says I must use 2 pole 
relays for the control current even though the disconnects will turn off all 
power for maintenance.

Enphase claims that the inverters will not shut down reliably with only one 
line opened. This does not make sense to me in view of UL 1741. Is Enphase 
correct in their claim, or are there other reasons that both poles need to be 
opened

I want to use the solid state relays because the coil voltage is between 3 and 
32 volts. This would avoid the need to add voltage dropping series resistors to 
protect the coil for higher battery voltages.

Alternatively, does anyone know of reasonably priced, 2 pole solid state relays?

Thanks,

Drake


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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Re: [RE-wrenches] AC Coupled Enphase

2017-08-28 Thread James Jefferson Jarvis 

On 8/28/2017 8:44 AM, Drake wrote:

Alternatively, does anyone know of reasonably priced, 2 pole solid state
relays?


Just use two single pole SSRs. One for each leg. There are two pole SSR, 
but the price is not going to be bargain basement.


-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727
www.aprsworld.com
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[RE-wrenches] AC Coupled Enphase

2017-08-28 Thread Drake 

Hello Wrenches,

I am going to AC couple some Enphase inverters and found some really 
nice solid state, single pole relays to control them with. Enphase 
says I must use 2 pole relays for the control current even though the 
disconnects will turn off all power for maintenance.


Enphase claims that the inverters will not shut down reliably with 
only one line opened. This does not make sense to me in view of UL 
1741. Is Enphase correct in their claim, or are there other reasons 
that both poles need to be opened


I want to use the solid state relays because the coil voltage is 
between 3 and 32 volts. This would avoid the need to add voltage 
dropping series resistors to protect the coil for higher battery voltages.


Alternatively, does anyone know of reasonably priced, 2 pole solid 
state relays?


Thanks,

Drake


Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328

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