[RE-wrenches] Battery Backup for Older Enphase Systems

[Gary Willett]

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
>
> On Thu, Nov 9, 2017 at 2:07 PM, John <john at gosolar.co.nz> 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:re-wrenches-bounces at lists.re-wrenches.org] 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
>> PIMBY Energy, LLC
>> NABCEP Certified Solar PV Installer®
>> 304-704-5943
>>
>> www.getpimby.blogspot.com
>> www.getpimby.com
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