[RE-wrenches] Convert Grid Tie SW4048 to Backup System; Add NewInverter, AC Coupled

[Comet Systems]

I would prefer a propane generator for these standby systems as diesel does
NOT store well especially in hot areas, diesels require more maintenance
and make more noise. For large loads over long periods, diesels have an
efficiency advantage, but propane generators are cleaner and cheaper.
A propane generator can be sit for years without issue, a diesel would gum
up and require serious maintenance.
And, if you are in an area with natural gas, you don't have to worry about
fuel storage or permitting of same.

Chris Mason
Factory trained Generac technician
NABCEP certified PV Installer

On Thu, Nov 17, 2011 at 9:41 PM, Marv Dargatz <Marv.Dargatz at solaredge.com>wrote:

> I agree 100% with Jay, except . . . I prefer diesel.
>
> You can store it safely (for several years), the energy density is high.
>
> And, you don't have to rely on delivery systems.
>
>
> See ya!
>
> Marv
> Director of Technology and Support, North America
> SolarEdge Technologies, Inc.
> Tech Support North America:  +877.360.5292
> Mobile: +530.392.0356
>
>
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of jay peltz
> Sent: Thursday, November 17, 2011 4:51 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Convert Grid Tie SW4048 to Backup System; Add
> New Inverter, AC Coupled
>
> HI Richard,
>
> I'll chime in, although you won't like it.
>
> Dump the system and start over with a new battery less system and a genny
> as back up.
>
> Told you, you wouldn't like it.
>
> The SW parts are basically gone and it was a terrible  grid tied inverter
> anyway.
> The modules are usable but why at $1.5 watt keep them?
> Client doesn't want MX, so that means no batteries.
>
> You'll need a genny as back up anyway for long power outages during
> storms, so get a natural gas/propane unit as back up instead of batteries.
>
> OK you asked,
>
> jay
>
> peltz power
> On Nov 17, 2011, at 4:03 PM, Richard L Ratico wrote:
>
> > Hi Wrenches,
> >
> > This is a repost. No replies the first time, so I'm trying one last time.
> >
> > I may be "adopting" an eleven year old, Y2K, grid tie with battery
> > back-up system. It consists of 12 - Astro-Power 120 modules, installed
> > in 2000, 12 - Evergreen  EC-110 modules installed in 2004, only one
> > MX60, which controls BOTH sub-arrays, one SW4048 in SELL mode through a
> dedicated load sub-panel.
> > Existing, seven year old battery is shot (8-Trojan L-16). Initial bank
> > of unknown batteries was replaced after only four years.
> >
> > Recent long, nearby, utility outages have the client requesting a
> > proposal to include a new back-up generator and to restore the system
> selling to the grid.
> > Client may decide go straight grid tie to eliminate the batteries.
> > They have found the maintenance to be a hassle.
> >
> > My thoughts so far:
> >
> > 1)To take advantage of most of the existing hardware, I wonder if it
> > makes sense to try to improve the system efficiency by relegating the
> > SW to a manual back-up mode only, where, say, by means of a timer
> > controlling grid availability through AC1, it would only charge a
> > smaller battery bank once a week. The battery bank would be small, a
> > single string of either, sealed gel units or T-105s with the new
> > Trojan watering system.
> > 2) Provide new grid-tie inverter/s (appropriate string type or Enphase
> > 190s) to handle the net metering.
> > 3) Provide a way to AC couple the new inverter/s to the SW in the
> > event of an outage.
> > 4) Provide a new Honda 3000 inverter type generator connected to AC2 in
> the SW.
> > 5)Provide a way to lockout the grid tie inverter/s when the generator
> > is operating.
> >
> > Any thoughts or suggestions would be greatly appreciated.
> >
> > Thanks in advance,
> >
> > Dick Ratico
> > Solarwind Electric
> > Bradford, VT
> > _______________________________________________
> > Li
>
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-- 
Chris Mason
President, Comet Systems Ltd
masonc at cometsystems.co
www.cometsystems.co
Cell: 264.235.5670
Int: +1305.767.2094
Skype: netconcepts
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