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

[Marv Dargatz]

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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