Charge Controller Setting for battery

[Sunking]

Hi Matrix,
Thank you for your advise.[LIST][*]If I set the Boost voltage to 30.2V, will it be too high for 24V batteries bank?[*]If I have enough sun time, does increase Boost Time is a better option for the batteries?[*]How to know if I have enough sun time?

Battery Hydrometer.

• The batteries are about 2ft below the controller. I don't remember the wire size but I think it's small wire. What is the correct gauge size for controller to 215A batteries?

What size is the Controller?

20 to 30 amps = 10 AWG
40 to 80 amps = 6 AWG

[littleharbor]

Doubt you have this option on your controller.

Vent your batteries to the outdoors if not already.

As I said, use the largest wire you can fit in the controller.

[monogram]

Doubt you have this option on your controller.

Yes, my controller does have option to set battery AH. I currently set it to 215AH as battery listed. Do you mean I need to increase that AH number up?

[littleharbor]

Setting the ah. of your battery doesn't necessarily set ending amps of absorb, er, Boost stage. You already mentioned it's set at 120 minutes. If you can set ending amps it should be 2 % of your ah. rating ie; 4 amps. If you cant do this you might see if changing your battery ah size changes the 120 minutes.

[monogram]

Setting the ah. of your battery doesn't necessarily set ending amps of absorb, er, Boost stage. You already mentioned it's set at 120 minutes. If you can set ending amps it should be 2 % of your ah. rating ie; 4 amps. If you cant do this you might see if changing your battery ah size changes the 120 minutes.

I'm lost on this, would you please explain it again for me?

Since the batteries are inside the house which produced the gas when charging, is it OK for me to have battery 10ft away from controller using solar wire 10AWG ?

[Sunking]

Litleharbor give up.

[monogram]

If you can set ending amps it should be 2 % of your ah. rating ie; 4 amps. If you cant do this you might see if changing your battery ah size changes the 120 minutes

Hi Littleharbor,
I'm lost, would you please explain it in more detail. An example is great.

[littleharbor]

I've tried, as Sunking has told you and tried to explain, himself. All I can say is go back and reread what has already been said. Also go and read the stickies at the beginning of the Off-Grid section. Do your best to understand what you've been told. You have been lucky in keeping your loads reasonable. If your controller has info on load control limits, follow it.
Good night.

[roma_pop]

Hello,
I have small question regarding charging flooded lead-acid batteries, I believe in case battery in boost charging mode starts extremely gassing then need to reduce boost charging time and it's mean that battery is full of charge (SOC about 100%), I'm wrong please?

Thanks in advance

[Mike90250]

Hello,
I have small question regarding charging flooded lead-acid batteries, I believe in case battery in boost charging mode starts extremely gassing then need to reduce boost charging time and it's mean that battery is full of charge (SOC about 100%), I'm wrong please?

Thanks in advance

We need to speak on common terms. "Boost" is a marketing term.
Please read this page, and study the chart

https://www.morningstarcorp.com/lead-acid-batteries/

and then we will be able to use common terms to get the answers to your questions.


Common terms for stages:
1 = Bulk
2 = Absorb (most gassing happens toward the end of this stage)
3 = Float
4 = monthly Equalize cycle

MS_charge_stages.png

[roma_pop]

We need to speak on common terms. "Boost" is a marketing term.

Is that mean "Boost" (marketing term) including both bulk and absorb stages?

[Mike90250]

Read the link I posted about charging protocol. Boost is a meaningless word. The 3 stages of charge are Bulk, Absorb & Float. Equalization is a remediation condition, not a "charge".

[Dayrobber]

I just read your Battery/Charge Controller stages. I realized my inverters over voltage setting is 14.4. My CC needed to be reset. What a weight off my shoulders. Thanks again. Dayrobber out. Later.