[RE-wrenches] Low voltage DC v. higher voltage DC

Sun Sep 16 00:07:46 EDT 2018

Sabaidee from Vientiane, Lao PDR.

Attached is the spec sheet on the BYD battery in question.

I’ve confirmed with SMA directly that there’s no capability for the Sunny Storage design (S.S., ABU and battery) to use a generator input.  My apologies for mis-stating earlier that it could accommodate a generator.

As far as grid-tie with batteries, the Holy Grail as far as I’m concerned is being able to provide whole house back-up and not have to do the old fashioned and pain in the arse critical load sub-panel.  The more choices that we’re provided, the more better.  So I’m pleased that companies like SMA, Ensync, SolarEdge and others are bringing new equipment and designs to market to allow for whole house back-up.

marco

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of jay
Sent: Saturday, September 15, 2018 5:00 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Low voltage DC v. higher voltage DC

HI Harry,

The battery is charged from the AC side correct?

And is the charging algorithm inside the ABU.

If so why couldn’t you use a generator to charge the battery?

jay

peltz power

On Sep 13, 2018, at 7:10 AM, Harry Mahon <Michael.Mahon at sma-america.com> wrote:

Marco – 

The Sunny Boy Storage “Advanced Backup Unit” accessory or ABU will be discussed at SPI in a couple weeks – first units are being stocked now at our warehouses in US.  The ABU will allow the SBS to be a grid former in case of utility outage, however there are no plans to have any generator inputs/controls to allow for battery charging from generat

And yes, BYD BBox HV 5.12/7.68/10.24 devices will be supported when available in US (will be this year I understand)

Mike

-----

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 < <http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org> 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
>  <http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org> bruce at mendocinosolar.com
> 
> *Connecting Mendocino County to Solar Since* *1994*
> 
> 

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