That would be roughly 14 deep cycle boat batteries (if you're doing things on the cheap)... realistically, 16, if you're doing 48v.
On Wed, Jan 13, 2021 at 10:16 AM Steve Jones <[email protected]> wrote: > 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 >> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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