[RE-wrenches] Low voltage DC v. higher voltage DC
cwarfel
cwarfel at entech-engineering.com
Thu Sep 13 10:43:45 EDT 2018
We just struggled through our first two OB RS Radian systems. We did not
opt for the "package" including batteries as we and our customers
thought it was overpriced. We build our own battery boxes and use cost
competitive batteries based on the customer's need.
OB needs to improve the installer experience for deciphering their
manuals for at least the 4048. It seems like the forgotten
stepchildcompared to the 8048.
That being said, we did get the systems running. The Radian seems solid.
Probably most of you know I am very much opposed to NEC Rapid
Shutdownfor reasons I have stated on this list. Modifying it, if not
eliminating it, would not make systems less safe, and would greatly
reduce these machinations of how to best meet this type of customer's
needs.
Chris
On 9/13/2018 2:14 AM, Marco Mangelsdorf wrote:
> The SMA Sunny Storage looks promising.
>
> It will be able to work with the LGC RESU10 HV battery and, sooner
> rather than later I hope, BYD package as well.
>
> And it will allow for a backup generator tie in.
>
> Ta-dah!
>
> marco
>
> On Thursday, September 13, 2018, Bruce Erickson
> <bruce at mendocinosolar.com <mailto:bruce at mendocinosolar.com>> wrote:
>
> Hi Marco,
>
> I partially agree with you. I recently bid Outback, StorEdge, and
> Pika options for a GTBB customer, partly to understand pricing for
> myself, and found OB to be so much more expensive. The customer
> really wanted a system that would be to be able to charge the
> batteries off a generator in an outage, understandably. But the
> extra thousands in cost for OB ended up being prohibitive. Add-on
> rapid shutdown is a killer. So he’s opting for a nice modern high
> voltage DC system, with optimizers and built-in RSD, but when
> there’s an extended outage, he’ll have to hope the sun comes out
> right after the storm to recharge the batteries, or he’ll end up
> in the dark again, until the grid comes back. Maybe there’s a high
> voltage inverter that allows generator charging, or a third-party
> battery charger, that I’m not aware of. Otherwise high voltage
> systems are very limited for backup, at least in winter storm
> scenarios.
>
> *Bruce Erickson*
> Mendocino Solar Service
> PO Box 1252
> Mendocino, CA 95460
> 707-937-1701
> 707-937-1741 fax
> bruce at mendocinosolar.com <mailto:bruce at mendocinosolar.com>
>
> /Connecting Mendocino County to Solar Since//1994/
>
>
>
>
>
>
>
>> On Sep 12, 2018, at 6:26 PM, Marco Mangelsdorf
>> <marco at pvthawaii.com <mailto:marco at pvthawaii.com>> wrote:
>>
>> Aloha all,
>> At the risk of whacking at a hornet’s nest…lower voltage DC is
>> soooo 80s and 90s especially when it comes to grid-tie
>> applications with battery storage.
>> The time of OutBack and Schneider and all the others doing 48VDC
>> is drawing to close. Enough already. Thank you for your service.
>> The sooner the industry fully migrates to higher voltage DC
>> (Tesla, LG Chem, BYD and others), the better.
>> marco
>> *From:*RE-wrenches
>> [mailto:re-wrenches-bounces at lists.re-wrenches.org
>> <mailto:re-wrenches-bounces at lists.re-wrenches.org>]*On Behalf
>> Of*Peter Giroux
>> *Sent:*Wednesday, September 12, 2018 3:03 PM
>> *To:*RE-wrenches
>> *Subject:*Re: [RE-wrenches] Any thoughts on this approach to
>> adding battery backup to an existing grid tie system will be
>> appreciated.
>> Ken
>> We have had terrific success with AC Coupling. Yes there are some
>> differences from Dc Coupled systems but if built properly,
>> customer is willing to learn how to use it and maintain it and
>> you put the correct relays in to shut off the string inverters if
>> battery voltage gets to high, great.
>> If you have a customer that refuses to exercise the system, not
>> check the batteries if they are fla's and overloads it when the
>> power goes down then not so cool. We have customers that power
>> shave with it, have had backup power for days until the power
>> came back on as they monitored the loads and were judicious about
>> use. Ray is right in the sense the customer needs to learn how to
>> use the system or they can royally screw it up ( yes we have had
>> two do this, one learned the other not ).
>> The Radians have been great work horses for this application,
>> sadly as Ray mentioned Outback has moved away from it as a
>> primary solution.
>> peter giroux
>> ASAE
>> Atlanta
>>> ----- Original Message -----
>>> *From:*Ken Schaal <mailto:Ken at commonwealthsolar.com>
>>> *To:*RE-wrenches <mailto:re-wrenches at lists.re-wrenches.org>;Ken
>>> Schaal <mailto:cwsolar1 at gmail.com>
>>> *Sent:*Wednesday, September 12, 2018 8:11 PM
>>> *Subject:*[RE-wrenches] Any thoughts on this approach to adding
>>> battery backup to an existing grid tie system will be appreciated.
>>> https://www.youtube.com/watch?v=eyhkIfS5Z-Q
>>> <https://www.youtube.com/watch?v=eyhkIfS5Z-Q>
>>> ------------------------------------------------------------------------
>>>
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--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401)466-8978
EEI logo <http://entech-engineering.com>
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