Solar charging batteries

[airshot]

Charging status, connected @ 14ish.

Readings of charged status, disconnected.

Hit 12.0 yesterday afternoon, eating local volunteer fire dept ham breakfast atm will check in a bit.

Ohhh...a ham breakfast.....most are just pancakes and sausage....ham would be great !

 

[redneck joe]

Ohhh...a ham breakfast.....most are just pancakes and sausage....ham would be great !

Country ham even....

And sausage, scrambled eggs maybe three, hot biscuit, gravy and jelly. 10 bucks, three lane drive thru at the department at 6am. They usually get about 1500 plates served i think I remember.

 

[airshot]

Country ham even....

And sausage, scrambled eggs maybe three, hot biscuit, gravy and jelly. 10 bucks, three lane drive thru at the department at 6am. They usually get about 1500 plates served i think I remember.

Haven't had a good ole country breakfast like that in a looking time...sounds yummy....just don't mention this to.my cardiologist...!!

 

[redneck joe]

OK, waited to post this until I was sure. Battery #1 was pulled off charger at 12.35. It gained to 12.36, then this morning is 12.39. How is it gaining, no matter how small, with no charger hooked to it?


Battery #2 active on charger up to 12.00 this morning.

I think I'll go reconnect my tach.

 

[Grub54891]

May have been warm due to charging causing more resistance? Cooling down let the animals out?

 

[redneck joe]

May have been warm due to charging causing more resistance? Cooling down let the animals out?

Hadn't thought of that. When I get hot and heavy with my ryobi tools I have to put those in the freezer before charging. Never tracked v tho.

 

[tpenfield]

I wouldn't be overly concerned about small deviations in the voltage readings . . . not sure how accurate or repeatable the DVM may be.

It sounds like battery #2 may be working properly, given its charge rate. It would be interesting to see if Battery #1 can support a load.

 

[redneck joe]

Yeah I'm hoping to be able to use on a solar garden pond pump or something. Pretty much all academic at this point because I can..

When I finally crack open and if find a bad cell can I just remove and call it good or is the bms set specifically for the amount of packs contained. Adding on to that, if I find same in other one can I just add them together I to one unit?

 

[redneck joe]

Battery #1 12.33

Battery #2 12.19 so slowing way up on charge rate.

Somewhere along this journey I think i know that the bms kicks back on at 12.6 v and I have not let either one get there so we shall see,

 

[Grub54891]

You will have to replace the cell in the bad one if need be. They work together.

 

[redneck joe]

Battery #1 no change, holding given charge so will quit reporting until I crack open.

Battery #2 is 12.36 so barely moving.

 

[tpenfield]

I am not hopeful for those batteries. Fully charged, the resting voltage should be in the 13.5+ range. Anything in the low 12 volt range is almost empty (about 12% charged)

 

[redneck joe]

 

[redneck joe]

Cover on the top, rubber caps over the sealed batteries cells inside???

 

[redneck joe]

 

[redneck joe]

 

[redneck joe]

Here are the numbers, not sure what they are supposed to be in a series connection?

The 12.56 is terminal to terminal, rest neg terminal to red wire at connection indicated.

 

[tpenfield]

Should be 3.2 volts (nominal), which gets to the battery spec of 12.8 volts. Fully charged the cells would be around 3.6 volts each.

The cell voltages are quite even, just low.