Four 150ah batteries would be a lot more coin than 12v to 48v if you can afford the run time loss.
On Tue, Aug 15, 2023 at 9:53 AM Brian Webster <[email protected]> wrote: > How many of the batteries do you have? Do you need any voltages other than > the 48 volts? If you have 4 batteries and only need 48 volts then wire them > in series and not have to deal with the converter. > > > > Thank you, > > Brian Webster > > > > > > *From:* AF [mailto:[email protected]] *On Behalf Of * > [email protected] > *Sent:* Tuesday, August 15, 2023 6:59 AM > *To:* 'AnimalFarm Microwave Users Group' > *Subject:* Re: [AFMUG] battery nerd question > > > > *You’re around C/30 which should be on the high end *of capacity*. > > Lower load usually means a little extra capacity out of the battery. I > realized that sentence might have been ambiguous. > > > > > > *From:* [email protected] <[email protected]> > *Sent:* Tuesday, August 15, 2023 6:56 AM > *To:* 'AnimalFarm Microwave Users Group' <[email protected]> > *Subject:* RE: [AFMUG] battery nerd question > > > > You can do the whole thing in Watts. > > > > 12V * 150ah = 1800 Watt-hours > > 1800Wh / 50W = 36 hours > > > > If they’re telling me 95% efficiency, I’d assume 50W out needs 53W in (50 > / 0.95). > > There’s usually an efficiency curve for the device based on load and > temperature so it wouldn’t be 95% in all circumstances. Your system should > be drawing less than 5A off the battery, and if your multimeter has a 10A > fuse like most do, then you could put the meter in line and actually > measure the amperage before and after the converter. Then you’d know for > sure. > > > > And the battery’s total capacity will have a curve based on C-rate so > there’s some variability there too. Usually it lasts longer when you’re > drawing lower amperage. You’re around C/30 which should be on the high > end. > > > > Age and maintenance of the battery affect runtime as well. If I want 6 > hours of runtime then I plan Ah for 12 hours runtime. When my batteries are > halfway toasted I’m still getting useful life out of them. > > > > > > *From:* AF <[email protected]> *On Behalf Of *Steve Jones > *Sent:* Monday, August 14, 2023 9:57 PM > *To:* AnimalFarm Microwave Users Group <[email protected]> > *Subject:* [AFMUG] battery nerd question > > > > Just trying to cipher runtimes > > I have on hand 150ah 12 volt batteries, so thats what id be looking to use. > > Excluding the conversion loss of a 12v to 48v step up converter is the > math correct here? > > 12v 150ah=1800 watt hours > 1800 watt hours at 48v = 37.5ah > 50 watts of radio running 48v = 1.04 amps > 37.5ah @ 1.04 amps = 32.77 hours runtime > > > > does a step up that claims 95% efficiency mean 95% of the watt hours? > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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