Battery Fuel Gauge [RE-wrenches]

[Joel Davidson]

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Wrenches,

I had another SW4048 inverter shutdown last night and had to switch the 
inverter bypass breakers. Grid power was 108 VAC. I think (in addition to 
worn out batteries) the inverter menu 11 AC Inputs > Set input low limit VAC 
108 default may be too low. Has anyone else with grid-tie systems 
experienced regular "light brown-outs"? What corrective action did you take?

Joel Davidson

----- Original Message ----- 
From: "Joel Davidson" <joeldavidson at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Wednesday, November 01, 2006 5:00 PM
Subject: Battery Fuel Gauge


> Wrenches,
>
> So where's this going? Last Sunday afternoon, I experienced a Southern 
> California Edison (SCE) power outage followed by 3 evenings and counting 
> of grid power brownouts (101 VAC). My SW4048 line-tie inverter saw the low 
> grid voltage and went to stand-alone mode, but my four old Johnson 
> Controls GC12V100B batteries did not last long and the inverter did its 
> low-voltage shutdown. So I flipped the inverter bypass switch and put up 
> with low grid voltage (thank you SCE for shortening the life of my home 
> equipment). Trouble-shooting and flipping switches by flashlight and 
> re-programming the inverter the day may be interesting for techno-guys, 
> but the average on- or off-grid PV system owner (our customers) would be 
> frustrated and angry if their battery bank ran out of juice leaving them 
> in the dark.
>
> Finally, the question: What "battery fuel gauge" do you think is the most 
> non-technical customer-friendly (easy to use, intuitive, reliable, etc.)?
>
> Joel Davidson 


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