[RE-wrenches] TIGO/ Classic 250 fights?

[boB at midnitesolar.com]

In addition, an SPD is supposed to keep any input lines to the equipment 
from breaking over
the insulation.  For the Classic, the hipot voltage is over 2000 volts 
to chassis (gnd).

If the SPDs are grounded and connected well they should be able to do 
their job unless maybe
it is a direct strike and then it is not so easy to visualize.

Anyway, this is why SPD voltages are normally higher than the usual 
maximum system
operating voltages.  But a good ground is essential.  Even a seemingly 
far off lightning
strike can cause high electric fields near an antenna or PV array or 
tower system but.

boB



On 7/4/2014 11:20 AM, boB at midnitesolar.com wrote:
>
> The SPD will (or, should), "clamp" the input voltages, both positive 
> and negative to ground at the
> MOV voltage rating during a lightning strike.  The SPD 300 starts at 
> about 500 volts on each leg
> of the SPD.  The 600 SPD is higher voltage of course.  Since, on the 
> PV input side, the MOVs
> appear to be in series, an SPD 300 should clamp the plus and minus 
> input to twice 500V or,
> about 100 volts which should not do anything to a charge controller 
> operating up to 250
> volts or even higher so I am not sire what happened here.  We'll have 
> to try to do an autopsy
> on the controller if possible on this one.
>
> We're still looking into the optimizer interaction issue.  It doesn't 
> really make any sense as
> to why they should "fight" though.  We have talked with Tigo on this 
> but nothing definitive
> yet as to why.
>
> Thanks and happy 4th of July,
> boB
>
>
>
> On 7/4/2014 7:51 AM, dan at foxfire-energy.com wrote:
>> Anyone else having problems with Midnight Classics Flaming out 
>> (Literally)? We know they don't play nice with Tigo Optimizers. 
>> Wondering if a Midnight SPD might also look like a short to a classic 
>> when it clamps. only affected two of the four controllers. Two seemed 
>> to be un affected, one tripped off and reset, Not only did the last 
>> one let the smoke out, but went Dali in the process. Painted up the 
>> wall and everything.Suggestions? Thanks db
>>
>> Dan Brown
>> Foxfire Energy Corp.
>> Renewable Energy Systems
>> (802)-483-2564
>> www.Foxfire-Energy.com <http://www.Foxfire-Energy.com>
>> NABCEP #092907-44
>>
>>
>>     -------- Original Message --------
>>     Subject: Re: [RE-wrenches] 2014 NEC
>>     From: Phil Forest <pforest at southmountain.com
>>     <mailto:pforest at southmountain.com>>
>>     Date: Tue, May 20, 2014 1:25 pm
>>     To: RE-wrenches <re-wrenches at lists.re-wrenches.org
>>     <mailto:re-wrenches at lists.re-wrenches.org>>
>>
>>     Will,
>>     No problems with inspectors for us in MA, regarding rapid
>>     shutdown, since we recently switched to using SolarEdge central
>>     inverters with optimizer under each module, for roof mounted
>>     installs.
>>     So far so good. They seem well made and engineered. Tip: you have
>>     to enable the arc fault protection when commissioning, ships
>>     disabled.
>>
>>     Phil Forest
>>     South Mountain Company
>>
>>     On May 20, 2014, at 10:59 AM, Will White
>>     <William.White at rgsenergy.com
>>     <mailto:William.White at rgsenergy.com>> wrote:
>>
>>>     Wrenches,
>>>     Is anyone else having problems with inspectors and the 2014
>>>     NEC?  In Mass we're having all kinds of issues with inspectors
>>>     requiring/allowing an array of different things for 690.12 rapid
>>>     shut down ranging from roof top disconnects, disconnects on the
>>>     side of a house 20' up, disconnects in attics, or only
>>>     disconnects that can be activated on the ground.  It varies
>>>     between inspectors.
>>>     We're also having problems with one inspector requiring arc
>>>     fault breakers on Enphase even though there are no UL listed arc
>>>     fault breakers that can be back fed or he wants us to run the
>>>     trunk cable in a raceway.
>>>     It's getting very difficult to install in Mass.
>>>     Thanks,
>>>     Will
>>>     *Will White*
>>>     Operations Manager - New England
>>>     RGS Energy
>>>
>>>     64 Main St. |Montpelier, VT 05602
>>>     tel 802.223.7804 |mobile 802.234.3167 |fax 802.223.8980
>>>     *RGSEnergy.com <http://www.rgsenergy.com/> **|
>>>     william.white at rgsenergy.com <mailto:william.white at rgsenergy.com> *
>>>
>>>

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