Woo Hoo..New AGM Batteries

[MrWizard]

two of the new ones in their workplace, the battery rack

last night 7:30pm meter 12.93v lights and fans running
this morning 6:30 am (early for us) 12.62v down 65ampHrs from full

i set the capacity at 500amphrs although technically it would be 540 at the 20hr ? rate
8hr rate would be 480amphrs total to discharge

anyway it like 2011 all over again, now i can go days if need be instead of just overnight

[MEXICOWANDERER]

It's a tough job but I manage to avoid snow down here. I also try my darndest to avoid temps in the 60's. But somebody's gotta do it.

[MEXICOWANDERER]

Cell towers down here chop digital image and internet communications. No texting, no long distance. Chop required power 83%

[pianotuna]

Hi Mex,

I had occasion to look at the power demands of a rural cell tower. It was using 1 KWH every 9 seconds. I don't know how many batteries they put in a bank for the towers nor do I know how long they expect the tower to remain powered.

I do have 4 for a 20 hour rate of 556 amp-hours and they laugh at the microwave. My particular unit draws 1530 watts.

I've had mine a year now and I use them HARD. The very best thing is no more laying in the snow to check electrolyte levels.

[MEXICOWANDERER]

And your personal synopsis...?

Hah! Just noticed (above) my grumbling mis-post in the wrong thread. Muchos apologies.

The 100-hour rate of Telecomm batteries is wildly better than in a similar 20 ampere hour rated non-telcomm battery. This is why (down here) they gang 20 - 30- 40 batteries in crucial microwave repeaters)

Mr Wizard you have without question the best battery choice for low amperage discharges. Worth remembering is......enough of these puppies in parallel will fire a microwave but the weight may be quite a penalty.

[MrWizard]

11:39pm friday night
12.80v
2 amp load
86.6% SOC

7:36am sat morning
12.76v
2 amp load
82.0% SOC

[MrWizard]

just a quick note

70 minutes after stopping all charging
down 15 ampHr aka 3AH per battery
load 10amps , 2amp per battery
battery SOC 97.7%
battery voltage 13.00v

fully charging batteries everyday of use, makes a significant difference
in batteries maintaining voltage

[MrWizard]

today was battery maintenance day
get the pliers and wrench, make sure all the cables are tight
get out the big brush, and dust off the batteries
No rust, no corrosion, no added water 🙂

it was more work lubing the sliding tray, which is getting due for replacement

[MrWizard]

Tuesday 6-20-2017 5:30 am, before sun up

12.73v
4.8 amp load/draw on batteries
down 78 amp hrs
SOC 88.1 percent

[MrWizard]

Put in service June 6 2016

Last night
Made ice with the ice machine, pulls about 15 amps for the inverter
And
Had several fans on all night

This morning
Down 100 amphrs overnight
Morning soc 85.x percent

Don't think I have ever seen voltage less than 12.6v 'at rest' AKA minimal load
Of course I'm running on memory, the might be a post in this thread that would run counter to that statement
Yes it does go to less than that while running the mw for coffee in the morning

[MrWizard]

between midnight and 8AM ,one 12v LED kitchen night light approx 7w and the fridge
no fans, no PC etc.

consumed power was 28 amphrs, according to the DC power meter
that amounts to 3.5 ampHr per hour and a combined ? duty cycle of approx 35 percent

600MA for the 7w night light = 4.8ampHr
so 22.2 ampHrs for the fridge, 2.775 amphrs per hr or 27.75 percent duty cycle ?

if i'm doing the math correctly

this based on a 10amp draw while running, at the end of cycle its closer to 8.5~9 amps just before cycling off a tapered draw, including that would probably raise the duty cycle another 1 percent or so, not the amphrs, just the actual run time percent

[MrWizard]

No. If the panels had been supply amps that the fridge was using the meter would have shown zero load or milliamps, that was the load on the batteries

I did not look at the controller or watt metre in the compartment to see what IF ANY the solar was supplying
I could have turned off the fridge to see if it went to charge , but I did not, if the solar was doing anything it was minimal, we had fog this morning

[pianotuna]

MrWizard,

Load of 10.5 amps--but were the panels supplying that 10.4 amps?

[BFL13]

I think Mex meant to post that in the Li 48 thread.

[MrWizard]

and the purpose of this post is ?

I don't do any complaining in this 'My battery' thread
Just post comments regarding status and use, and any charging tests

Similar to what I do in my solar panel thread