Hi William I feel it's impossible to discuss without more specifics.
For example if the extreme loads are only every ( just run the genny) so often vs seasonal ( maybe AC coupling makes more sense vs cycling a extremely expensive battery 4 x day), vs year round vs what is do able etc I would be curious to know what some of the parameters are, as I'm sure others as well Jay Peltz power. Sent from my iPhone On Aug 16, 2013, at 10:53 AM, "William Miller" <will...@millersolar.com> wrote: > Friends: > > We have been receiving a flurry of requests for design of off-grid systems > where the loads are enormous, relative to normal off-grid requirements. It > is obvious that the size of PV and battery arrays to power these loads is > beyond what is practical. We have dubbed these systems Generator/battery > with PV assist, or PV assist for short. > > These systems will cycle batteries multiple times per day. It is my > understanding that the extra battery cycels will shorten battery life. Since > generator run is expected, we are willing to increase generator run time in > order to prolong battery life. > > The parameters I suggest are an aggressive load start and a very high battery > start parameter. This will prevent deep discharge of the battery bank. I > know shallow discharge is not the norm, but I don't believe shallow cycling > is a problem as long is it as at the top of the voltage window, i.e. the > batteries achieve absorption at least once per day. > > We know a load start ciuld result in an abbreviated run time, curtailing > absorption period, but we are assuming there will be a battery votage start > at least once per day allowing full absorption. > > Has anyone else considered these issues, and what conclusions did you make > > I am looking forward to a spirited discussion as usual. I throuroughlyenjoy > and beneift from them, even thought the advice is usually conflilcting. > Thanks in advance. > > William Miller > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & 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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