BTW, the useful life of a lead acid battery charge cycle is 50% state of charge (~12.1V). Repeatedly discharging below this will shorten battery life. Discharging below ~11.6V will permanently damage a lead acid battery. So, even tho your batteries are probably already shot, you might load test it only down to ~12.1V.
Gus On Tue, Mar 2, 2021 at 2:46 PM Gus Bernard <[email protected]> wrote: > What Rick & John said. > > If those 3 batteries have been sitting there since 2012, they're likely > past their end of life and no longer reliable. A "run of the mill" marine > battery will last only 5yrs. A cheap (Walmart) marine battery, maybe > 3yrs. I'd replace them and/or do a load test on them (with a heat gun or > hair dryer). > > To operate reliably, the system you describe requires decent quality > "storage" batteries. Even a *deep cycle* marine battery is not a good > solar system *storage* battery. The cheapest (in the short run) reliable > solution is to use flooded lead acid golf cart or forklift batteries. The > cheapest (in the long run) solution is LiFePO4. > > For solar system storage battery info, see DIY Solar Power with Will > Prowse <https://www.youtube.com/channel/UCoj6RxIAQq8kmJme-5dnN0Q>, or > hundreds of others on YouTube. > > Gus > K5GMB > > On Tue, Mar 2, 2021 at 3:05 AM Gayle Dotts via BVARC <[email protected]> > wrote: > >> My emergency contingency consists of 3 solar panels totaling 200+ watts >> charging 3 Marine 12v batteries, then hooked up to an 2000 watt inverter. >> All to run a 7 cubic foot chest freezer a couple of fans and some lights. >> Had this since 2012 "end of the world scare" but never actually used in an >> emergency until our BIG freeze. It failed!! >> Everything was charged up and working except my inverter. When hooked up >> it made a beeping sound and then shut down.. I read somewhere that they >> might have an internal battery that might have failed. Any thoughts? >> >> Gayle >> WB5DOT >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> Publicly available archives are available here: >> https://www.mail-archive.com/[email protected]/ >> >
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