May I ask is the delay to comply with NEC 702? Has the grid to go down and for long enough for the transfer switch to change over from grid to off-grid?
On Mon, Nov 20, 2017 at 2:40 PM, Dave Tedeyan <[email protected]> wrote: > Gary, > Sorry for the delay. You had asked me about the Enphase/Sonnen solution, > copied below. > > Since this is a grid tied battery backup situation, the only brute OFF > situations would be > in a grid outage. Once the batteries are charged, then the Sonnen continues > to sell extra > PV to the grid. And in the case of a power outage, the Sonnen is actually a > little slow in > transitioning. It takes around 10 seconds (if I remember correctly) for the > Sonnen to start > powering the backed up loads. So no matter what you have for the AC coupled > PV, you > will have a small gap in power during an outage. > > I hope this answered your question... If not, I'll try to respond quicker > next time. > Cheers, > Dave > > > > DAVE: > > > > How does the brute force OFF transitions of the 8K of Enphase AC-coupled > > micro-inverters affect the AC loads being served by the Sonnen? Are > > there any noticeable/measurable glitches in the Sonnen's distributed AC? > > > > I am assuming the Enphase ON transitions are more graceful because of > > the UL1741 prove-in period and the individual ramp-up of the individual > > microinverters. > > > > Regards, > > > > Gary Willett PE > > Icarus Engineering & Solar Services LLC > > > *--* > > > *Dave Tedeyan* > *Project Engineer* > > *Taitem Engineering, PC* > 10 Verizon Lane, Lansing, NY 14882 > Voice: (607) 930-3481 x6 > www.taitem.com > > On Mon, Nov 13, 2017 at 10:52 AM, Drake < > [email protected]> wrote: > > > Hi Nick, > > > > Please send me your information. Currently I am finishing up an Enphase > > M-250, AC coupled system that is designed to taper charge batteries by > > dropping out groups of inverters based on battery voltage. > > > > Thanks, > > > > Drake > > > > Drake Chamberlin > > Athens Electric LLC > > OH License 44810 > > CO License 3773 > > NABCEP Certified Solar PV > > 740-448-7328 > > > > > > > > At 11:58 PM 11/11/2017, you wrote: > > > >> Hi Wrenches, > >> > >> > >> We now have the ability to provide frequency based power curtailment. > If > >> you are AC Coupling with a battery-based inverter that can fluctuate > >> frequency to regulate charge on the battery, then we can ramp our > output up > >> and down to regulate the charge more evenly. > >> > >> > >> If you have an AC Coupled system using Enphase microinverters, reach out > >> to me and I will set your company up with a grid profile that can > provide > >> this option. Once your company has been granted access to this profile, > >> you can update the profile using either our Installer Toolkit (ITK) app > or > >> Enlighten. > >> > >> > >> Cordially, > >> > >> Nick Soleil > >> > >> Enphase Energy | Product Manager, Envoy and IQ Accessories > >> > >> > >> (707) 763-4784 x7267 // office > >> > >> (707) 321-2937 // cell > >> > >> [Enphase_esig_logo6.jpg]<https://enphase.com/> > >> > >> > >> Energy Evolved<http://enphase.com>™ > >> > >> Powering What’s Next™ | The Enphase Energy Management System< > >> http://ow.ly/HbVS3> > >> > >> > >> NABCEP Certified Solar PV Installer #03262011-300 > >> > >> California C10 Licensed Electrician #986315 > >> > >> Texas Master Electrician #284451 > >> > >> > >> > >> > >> ________________________________ > >> From: RE-wrenches <[email protected]> on behalf > >> of Gary Willett <[email protected]> > >> Sent: Saturday, November 11, 2017 3:34 PM > >> To: [email protected] > >> Subject: Re: [RE-wrenches] Battery Backup for Older Enphase Systems > >> > >> DAVE: > >> > >> How does the brute force OFF transitions of the 8K of Enphase AC-coupled > >> micro-inverters affect the AC loads being served by the Sonnen? Are > >> there any noticeable/measurable glitches in the Sonnen's distributed AC? > >> > >> I am assuming the Enphase ON transitions are more graceful because of > >> the UL1741 prove-in period and the individual ramp-up of the individual > >> microinverters. > >> > >> Regards, > >> > >> Gary Willett PE > >> Icarus Engineering & Solar Services LLC > >> > >> > >> On 11/9/17 2:28 PM, Dave Tedeyan wrote: > >> > You could go with a Sonnen. That is meant to be AC coupled, and its a > >> very > >> > simple install. > >> > Nice piece of equipment, but its expensive. We just installed one that > >> has > >> > right around 8kw of Enphase M215 inverter output. So far, no issues. > >> > > >> > Cheers, > >> > Dave > >> > > >> > > >> > *--* > >> > > >> > > >> > *Dave Tedeyan* > >> > *Project Engineer* > >> > > >> > *Taitem Engineering, PC* > >> > 10 Verizon Lane, Lansing, NY 14882 > >> > Voice: (607) 930-3481 x6 > >> > www.taitem.com<http://www.taitem.com> > >> > > >> > On Thu, Nov 9, 2017 at 2:07 PM, John <[email protected]> wrote: > >> > > >> >> We did one a few months ago using Outback VFX3024e, 1000 a/h battery > >> bank > >> >> - basically an Off-Grid system but tied into the switchboard, with > >> customer > >> >> nominated circuits dedicated to the Off-Grid system. The grid is > >> acting > >> >> like the backup generator via a relay. > >> >> > >> >> The only little hiccup was that when the *generator* was called on, > the > >> >> Off-Grid system had to sync in with the real Grid, it was not > >> immediate. > >> >> > >> >> Apart from that - seems to work O.K. John, > >> GoSolar > >> >> Ltd, Christchurch, N.Z. > >> >> > >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> >> ++++++++++++++++++++++++++++++++++++++++++++++++ > >> >> > >> >> -----Original Message----- > >> >> From: RE-wrenches [mailto:[email protected]] > >> On > >> >> Behalf Of Matt Sherald > >> >> Sent: Friday, 10 November 2017 3:43 a.m. > >> >> To: RE-wrenches > >> >> Subject: [RE-wrenches] Battery Backup for Older Enphase Systems > >> >> > >> >> I'd appreciate some ideas as to what backup system designs work well > >> with > >> >> the older Enhase equipment (M250/215 era). > >> >> > >> >> I've tried this at home with a XW4024, but the frequency rise causes > >> the > >> >> lights to flicker and it is awfully unpleasant. > >> >> > >> >> A customer of mine has asked about backup to go with an array that > uses > >> >> M250s and this prompted me to write. > >> >> > >> >> Thanks in advance! > >> >> > >> >> -Matt > >> >> > >> >> -- > >> >> Matt Sherald > >> >> 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