That UBG battery can be only taken down 40%.
40% DOD, 60%SOC, but I deleted my comment because I was confused. I read that for a different UPG battery, https://www.solar-electric.com/upg-universal-ub-4d-45965-sla-agm-deep-cycle-battery.html
On that link it says this:UPG discharging recommendation: this battery should not
be discharged beyond a 40% depth of discharge (DOD). That means the
battery should retain no less than 60% of its rated capacity. If the
battery is drawn below that threshold, it could prevent the battery from
returning to a full charge.
I thought the glass mat hindered sulfate formation...so much for that. When is this simple sulfate problem going to be solvedin batteries??? I truly think its because battery makers want people to buy more batteries sooner. Its the American way of thinking.But that wont be around forever. Thats the good news.How about this...... if you want a job as an energy storage engineer right out of college that pays 100K and youve never so much as broke a sweat in your life raking leaves,,,, then you get a 6 month trial with a company and if you dont come up with a new technology( like a sulfate free design) of some kind you get 35K for a salary instead.95% doing almost nothing all day.....5 % doing the rest..
Here's the chart, pretty universal for all deep cycles, except special ones, HUP1 and such.
I agree with MVAS about his reading of the NAWS website note and the USB specifications. Should be just the usual warning about storing lead acid batteries at partial charge... Typically I use 75% minimum State of Charge while storing (recharge if battery is at or below 75% SoC) to reduce the forming of hard lead sulfate crystals--Which takes that "lead out of the battery ability to charge/discharge"... UBG uses 60% SoC for minimum storage charge level before sulfation accelerates...Sent a message to NAWS about that note...-Bill
From what little I understand, the best you can do is knock the black lead sulfate crystals off the plates so that more active material is exposed again.-Bill
Marc Kurth said:
I can't help but wonder how much sulfation has occurred from the previous limit of 1 hour absorb. What brand are these?
Marc Kurth said:
Fullriver has generally not suggested EQ in the past. Have they published a new stance on this? Do I recall correctly that these were "new old stock?" What is the standing voltage after fully charging, then standing for 4+ hours and no discharging?