[RE-wrenches] Module-Level Shutdown for off grid systems

Fri Sep 27 21:56:56 EDT 2019

Just a reminder to everyone struggling with this issue that only building-attached circuits energized by PV sources require RSD. So ground mounts generally don’t, or at least would only require a disconnect at the building if sending dc circuits into buildings.

Energy Storage is covered under article 706 in 2017 and does not require any shutdown, just sensible disconnection requirements.

Jason Fisher

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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Chris Sparadeo <sparadeo.chris at gmail.com>
Sent: Friday, September 27, 2019 5:00 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Module-Level Shutdown for off grid systems

For AC coupled battery based systems it’s a pretty easy solution. Any run of the mill module level RSD compliant grid tied inverter system can work. Obviously, there are major advantages to DC coupling and this is were it gets tricky. Outback has a nice string level RSD option with the ICS, but I haven’t found a comparable solution for other products. This seems like a great opportunity for a company like MidNite to create a solution.

On Fri, Sep 27, 2019 at 6:59 PM Chris Sparadeo <c2 at catamountsolar.com<mailto:c2 at catamountsolar.com>> wrote:
For AC coupled battery based systems it’s a pretty easy solution. Any run of the mill module level RSD compliant grid tied inverter system can work. Obviously, there are major advantages to DC coupling and this is were it gets tricky. Outback has a nice string level RSD option with the ICS, but I haven’t found a comparable solution for other products. This seems like a great opportunity for a company like MidNite to create a solution.

On Fri, Sep 27, 2019 at 6:21 PM Glenn Burt <Glenn.burt at glbcc.com<mailto:Glenn.burt at glbcc.com>> wrote:
The difference in topologies is that when the Tigo devices are used with an inverter driving the control is that it is relying on the Sunspec Alliance standard to be implemented correctly between the inverter manufacturer and Tigo.
When using the Tigo devices at the modules and the Togo RSS box for control, the inverter is not involved and it removes a layer of possible incompatibility and finger pointing if things go sideways.

We have been told of such hiccups by our distributor, and they are pushing the IMO Fire raptor solution. Unfortunately they sell the SMA branded Tigo devices so have no feedback on their use with the RSS controller, only with the SMA inverter control of the rooftop devices.
I have attended a couple of Tigo trainings, and the all Togo option looks straightforward. We have quoted their use a couple of times now, but have not yet done an install.

-Glenn
Sent from my 'smart'phone, so please excuse typos and spelling errors.

------ Original message------
From: Jerry Shafer
Date: Fri, Sep 27, 2019 1:40 PM
To: RE-wrenches;
Cc:
Subject:Re: [RE-wrenches] Module-Level Shutdown for off grid systems

Wrenches
Yes l am looking at the Tigo, they work with SMA and outback,
Jerry

On Fri, Sep 27, 2019, 10:24 AM Lorenzo Ortiz <lorenzo at cal-solar.com<mailto:lorenzo at cal-solar.com>> wrote:
Wrenches,

Are any of you looking ahead at solutions for module level rapid shutdown for off grid? Here in CA it's being implemented next year (at least in my area) and I haven't found any reliable, proven, cost-effective products yet.
I know Tigo has some sort of inline component but haven't heard a lot about it.

Any input is appreciated.

Thanks

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