Solar charging batteries

redneck joe

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• Monday at 5:12 PM

• #41

airshot said:

Might not have a powerful enough solar panel to get that minimum needed voltage/ amps or what ever power they need.

Click to expand...

I used the plug in that came with it for 24 hours. I seemed to have e killed them.

 

A

airshot

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• Monday at 6:26 PM

• #42

redneck joe said:

I used the plug in that came with it for 24 hours. I seemed to have e killed them.

Click to expand...

Under warranty ?

 

redneck joe

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• Tuesday at 3:21 AM

• #43

airshot said:

Under warranty ?

Click to expand...

Nope missed by about three months.

 

tpenfield

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• Tuesday at 3:43 AM

• #44

@redneck joe ,
About the LiFePO4 battery . . .

> Brand and Amp-hour rating?

> With nothing connected and no charging, are you getting any voltage reading from the battery (use a DVM to test it).

> A charger with "0Volt charging" may be needed to bring them back to life. . . it looks like the charger you have should do the "0Volt" thing.

> Don't worry about 14.3 vs. 14.6 reading while charging. . . as the battery charges up the voltage should rise (absorption phase of charging)

> Your solar capacity (20 watts) is still pretty low to bring an LFP battery up after use. You may need an MPPT controller in between the solar panel and the battery.

 

redneck joe

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• Tuesday at 5:24 AM

• #45

The battery has a built in bms?

 

tpenfield

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• Tuesday at 6:02 AM

• #46

redneck joe said:

The battery has a built in bms?

Click to expand...

Most LFP batteries do.

Brand and Ah rating? Got any pics to share?

 

redneck joe

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• Tuesday at 6:37 AM

• #47

Got a 20 and a 50 ah hooked together

https://www.amazon.com/dp/B0B7B29LWF?ref=ppx_pop_dt_b_asin_image&th=1

 

redneck joe

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• Tuesday at 6:38 AM

• #48

This is the charger

https://www.amazon.com/dp/B082LV7RKL?ref=ppx_pop_dt_b_product_details&th=1

 

redneck joe

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• Tuesday at 6:38 AM

• #49

Some of your questions might have been answered earlier in the thread but I gotta get to work.

 

A

airshot

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• Tuesday at 9:19 AM

• #50

redneck joe said:

Got a 20 and a 50 ah hooked together

https://www.amazon.com/dp/B0B7B29LWF?ref=ppx_pop_dt_b_asin_image&th=1

Click to expand...

That could be a problem, batteries are supposed to be same type and size....

 

A

airshot

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• Tuesday at 9:25 AM

• #51

redneck joe said:

Nope missed by about three months.

Click to expand...

Contact the manufacturer anyway, if reputable they will help you out, even with instructions on how to fix your issue. One of the reasons I choose the brand I have, is due to service after the sale and after the warrant expired..
Some folks have said the mfgr helped them even after the warranty was up.
Worth a try anyhow !!

 

tpenfield

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• Wednesday at 3:20 AM

• #52

Running 2 LFP batteries of different Ah ratings are 'outside' of general best practices and manufacturer recommendations. Not sure if the BMS within the batteries are going to like that. . . probably not.

A few pictures of the batteries and your set-up may help us better understand what you have.

 

redneck joe

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• Wednesday at 1:16 PM

• #53

Don't mind the extra black pigtail.

 

tpenfield

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• Wednesday at 1:39 PM

• #54

Are these what you got?

.

.
Picture sort of looks like 2 x the 50 Ah battery . . .

Are they both dead?

 

redneck joe

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• Wednesday at 1:57 PM

• #55

Yes, the posts are just bolts that gets screwed in. Pics show both ways.

Dead is relative i guess, what is your definition

 

tpenfield

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• Wednesday at 3:05 PM

• #56

redneck joe said:

Yes, the posts are just bolts that gets screwed in. Pics show both ways.

Dead is relative i guess, what is your definition

Click to expand...

Sort of like this . . .

.

 

redneck joe

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• Wednesday at 3:26 PM

• #57

Well the box they are is sort of a coffin...

 

redneck joe

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• Thursday at 2:48 PM

• #58

OK new starting battery so moved the lead acid deep cycle up front until I want to afford new lifepo but in the interim here is what I'm doing.

Side note, I did buy two 50ah I forgot the 20 ah is for the deck lights on a solar panel. So I had two of the same hooked together.

First Pic, this is voltage to start. I do not remember it being that low when hooked together.

 

redneck joe

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• Thursday at 2:49 PM

• #59

Here is charge rate, I checked about 30 min after beginning and was at 14.48. Two hours later the battery is at 9.65 v. Im leaving overnight. The charger is indicating filly charged then not and goes into charging mode, about every hour or so.

 

redneck joe

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• Thursday at 2:52 PM

• #60

Here is the other battery as pulled from the boat. Much higher on the begining voltage. I'll attempt to charge in a couple days after working the first one.