Out of curiousity, what does 16kwh storage look like? That seems to be a lot of battery.
On Tue, Jan 12, 2021, 1:20 PM Chuck McCown via AF <[email protected]> wrote: > Assuming a hard to get to place, higher latitude with a real winter, I > would > say: > > 1000W of panel. (20X load) > 16 kWh storage. (14 days autonomy) > > So right in line with Bill's recommendation. > > -----Original Message----- > From: Bill Prince > Sent: Tuesday, January 12, 2021 11:55 AM > To: [email protected] > Subject: Re: [AFMUG] Solar/Battery for Micro-PoP > > If your load is 50W, then you need to deal with ~~ 1.2 KWH of energy > usage per day (50*24). > > We don't know your latitude, or location, so you will have to plug in > whatever solar values are typical for your area. However, a good rule of > thumb for mid-latitude areas is to have enough battery for 10 days of > operation without sun. So you will need about 12KWH of battery storage. > If you're using lead acid batteries, double that for 24KWH of storage. > > Then you will need enough solar for you to recover that in one or two > days. For example, if you have 1200 watts of solar, you can typically > expect to get back 4.8KWH per day (5 hour day at 80%). > > A 48V system would be the most efficient. It will require smaller wires, > and converting from 48->24 is more efficient than the other way around. > > Separately, I would suggest to examine your sanity for thinking you > might be the only one in the US to make TVWS actually work. > > > bp > <part15sbs{at}gmail{dot}com> > > On 1/12/2021 10:42 AM, D. Bernardi wrote: > > > > Hi, > > > > I'm considering some fixed wireless (TVWS) trials and/or the ability to > > deliver temporary service where there's no available power source. I've > > done some basic solar system calculations (and there are plenty of > > calculators) but I'm looking for some real world pointers from those > that > > have deployed off-grid micro-PoPs. > > > > DC only, no inverters required. We may need 24v PoE and 48v PoE so would > a > > 48v system with step down to 24v be more efficient than 12v or 24v with > a > > step up? Other trade-offs to consider for 12v/24v/48v storage systems? > > > > I don't have actual load measurements yet but at this point I'm > currently > > sizing for a 50w load. The base station and backhaul radios combined > > should be ~ 30w. > > > > Thanks, > > Dave B. > > > > -- > 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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