The only real reason I can see for using an LVD, is if the voltage going to low is going to cause problems... for example, ePMP radios have a feature where they can be reset to defaults with a power cycle sequence - I have seen that get triggered by the voltage going to low (probably actually because the PoE device that was powering them started shutting down). I don't see it really mattering that much for saving batteries... if it's happening often enough that it's going to significantly damage the batteries, you obviously need a lot bigger batteries, or a generator.
On Thu, Aug 8, 2019 at 9:58 AM <[email protected]> wrote: > My problem with LVDs over the years has been the hysterisis. Power has > been back on for an hour but the voltage is still not high enough for the > LVD to power everything back up. I never saw any difference in battery > life in sites with LVD and non LVD. Generators are the way to go. > > *From:* Ken Hohhof > *Sent:* Thursday, August 8, 2019 8:22 AM > *To:* 'AnimalFarm Microwave Users Group' > *Subject:* Re: [AFMUG] LVD > > > Another approach if you can’t get out there fast enough with a portable > generator would be strategic load shedding. Often we see that 90% of the > customers are also without power so we’re getting no benefit by keeping the > APs running, but maybe we’d like to keep the backhauls up so other sites > aren’t affected. > > > > My observation is once you get to the LVD trip point, the rate at which > the battery voltage is dropping has accelerated and there’s not much > runtime left anyway. Also I worry about equipment getting into a locked up > state if the DC voltage got too low but didn’t cleanly go off and back on. > > > > Normally we try to have enough battery runtime that we can get there with > a generator. There are extreme circumstances though, like widespread power > outages, or we’ve had ice storms that took down power wires but also made > the roads impassable for 24 hours. > > > > I do sometimes wish battery management systems with built in LVDs would > let us adjust the trip point a little lower, like maybe 19 or 20 volts > instead of 21. > > > > > > *From:* AF <[email protected]> *On Behalf Of *Chuck McCown > > > *Sent:* Thursday, August 8, 2019 8:57 AM > *To:* AnimalFarm Microwave Users Group <[email protected]> > *Subject:* Re: [AFMUG] LVD > > > > Philosophical question. With infrequent outages I would prefer to keep > people on line for as long as possible, So no lvd or set it below where > the equipment ceases to function. > > > > If you have protracted outages get a generator. I don’t see a use for lvd > equipment unless it is in a remote area and powering non critical gear. > > Sent from my iPhone > > > On Aug 8, 2019, at 1:12 AM, [email protected] < > [email protected]> wrote: > > At what point would you want to enable an LVD on a 12V and 24V system? > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > ------------------------------ > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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