On Sunday, September 2, 2012, Richard L Ratico wrote: > If the clients have a Trimetric or similar meter, perhaps they could be > trained > to power some loads with their inverter, while simultaneously charging > their > batteries and minding the charge rate, rather than tweaking the CC setup. > Make > hay while the sun shines so to speak, particularly when the battery is > small > relative to the array. > > Dick > > --- You wrote: > Thanks Dan/Dick and Larry $E2Ai > > My concern was too high a charge rate, particularly when the batteries are > cycled during or after an outage when the controllers are delivering > maximum > current and the inverter is not selling, yet not wanting to limit the > charge > controllers when we$E2Aore back in grid tied mode. Outback noted that you > can > just limit the controllers during extended outages, but I would prefer that > customers not have to make adjustments to the charge rates. > > What I failed to consider is the particularly high charge rates that AGMs > are > able to withstand compared to FLAs. With a few tweaks to the system design > we > can easily hit a ~ .25C rate which is ideal for the batteries. > > I like the perspective of the inverter as diversion controller when > it$E2Aos in > sell mode. > > Thanks again for your help! > > Rich > > > > From: re-wrenches-boun...@lists.re-wrenches.org <javascript:;> > [mailto:re-wrenches-boun...@lists.re-wrenches.org <javascript:;>] On > Behalf Of > d...@foxfire-energy.com <javascript:;> > Sent: Sunday, September 02, 2012 11:01 AM > To: RE-wrenches > Subject: Re: [RE-wrenches] Grid tie with BB > > > > I'm with Dick. I liken grid tied inverters to diversion controllers. MPPT > charge > controllers (In Grid Tie Mode / talking to a HUB), pretty much just track > a max > power from the array. Good luck. > > > > db > > > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com > NABCEP #092907-44 > > > > -------- Original Message -------- > Subject: Re: [RE-wrenches] Grid tie with BB > From: richard.l.rat...@valley.net <javascript:;> (Richard L Ratico) > Date: Sun, September 02, 2012 9:16 am > To: re-wrenches@lists.re-wrenches.org <javascript:;> > > Rich, > > If I understand your question, I think you're missing the functioning of > the > inverter. Working independently of the charge controller, it will sell to > prevent overcharging the batteries. Correctly configuring the inverter's > voltage > thresholds accomplishes this. > > Dick Ratico > > > --- You wrote: > Wrenches, > > I'm have a mental block with battery backup systems such as the Outback > Radian. Perhaps someone can help me get over it! > > Essentially these systems sell back power off the top of the battery bank > and the array is maintaining the state of charge of the battery bank > through > traditional charge controllers. If you have a modest battery bank sized for > limited use on critical circuits and a good size array for the benefit of > net metering I would think it would be necessary to limit the current the > charge controllers are capable of delivering to the battery bank to prevent > damage to the batteries when the controllers are Bulking or Absorbing, but > then it would seem that we limiting the utility of the larger array. If the > current from the controllers was not limited they will self-limit as > voltage > rises, plus I suppose they will mostly be in float mode except when the > batteries are cycled but again it seems that we are limiting the capability > of the array compared to a straight grid tied system with a traditional > grid > tied only inverter. > > An example would be a 8000 watt array using a couple of flexmax80 > controllers with a string of 8 - L16 AGMs feeding a Radian. > > What am I missing here? > > Thanks > > Rich > --- end of quote --- > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org <javascript:;> > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > >
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