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It sounds like your battery and system are fine. Just completely ignore the SOC % reading. Just ignore it. Pay no attention to it. 12.0V is 50% (do not go below this) for lead acid and 12.9V is considered full, more or less. And if there is any load or charge on the battery, then the voltage...

I've only watched one youtube video so far, but the guy built his box with some sort of non-combustable lightweight board. Double-walled, wall filled with basic fiberglass insulation. He put an extension tube on the exhaust of the generator and cut a hole in the box all the way to the ground. No...

I have a NOCO Gen2 20A charger than supposedly has 9-stages, one of which is an equalization stage. But I have no idea how to know which stage the charger is on. There are two LED lights that will slowly flash red when charging and solid green when fully charged, but that's about it. And it must...

Lol, we think alike. Yes, so many rules. But I'm slowly starting to understand things more. My understanding is while yes you want to charge an AGM bank at 0.2C, it doesn't need to be done every single day. Once or twice a week is fine, as long as you're respecting the 50% DoD. Every day would...

I wouldn't change any parameters. We still don't know what the actual voltage is of your battery, with no load and no charging. We know that the SOC is not accurate and I agree with Mike that you probably have no actual problem, other than an inaccurate gauge. But if your static battery voltage...

That's the deal with too small a charge controller, too few panels and lead acid (especially AGM). Your math isn't wrong. I'm in the same boat. I read somewhere that 0.125C (12.5A for an 100Ah 12v) is the bare minimum that AGM is happy with, but 0.2 to a max of 0.3C is better. Now if you have...

Yes your battery is a 12v battery, but what the person you're replying to meant is what is the voltage of the battery right now. It could be as high as 14.4V during charging or as low as 9 or 10V (or lower) if it's been severely depleted. In order to accurately measure the current voltage, you...

So let's do some math. Say you use 20w during the day + 10W for inverter use=30W. Then you use 28W+10W at night = 38W. Your total use per 24 hours is 30+38W=68Wh (watt hours). Your 110Ah battery has a usable 55Ah, converted into watt-hours is 55*12=660Wh. Assuming your inverter has an 80%...

So what batteries do you have in there now? And if more than one battery, did you purchase and install at the same time. 100% and that very night it went down to 58%? And this happened night after night? If that's the case, something is wrong, but I don't know what. I don't understand this...

I think we went over this before. If you are waking up in the morning and discovering your AGM battery is at 19% SOC, then you have over-discharged the battery by 31%. Sealed Lead Acid batteries like AGM will best perform and last longest and maintain more of their original capacity if they are...

Besides actual inefficiencies, don't forget the power used by devices used in the system. My Renogy 2000W inverter uses 24 watts if it is turned on, regardless of whether or not it's powering something connected to one of the AC outlets. For a big system with plenty of panels and battery, no big...

I watched a video yesterday of a guy demonstrating this to pre-charge the caps in his 48V inverter. It worked, no sparks and not enough juice for long enough to be dangerous. From what I've read (I think Will Prowse said this), it's essential to do on a 48V system, good idea on 24V and not...

Without more info, no one can say much. My guess is either you have probably been undercharging the batteries (do you charge only by solar and if so what is your controller and panel setup and if you charge also with an AC charger what are the specs of the charger?) A single 100Ah will require...

I just came across this Wikipedia entry that explains why AGM is charged the way it is. Basically, if the battery is discharged to 50%, it can accept a high rate of charge (say 25A in your case) up to 70%, then the remaining 30% (and arguably the most usable part) takes a rather long time to...

What do you mean by VRSLA? I had to google the term and Wikipedia says that VRSLA (valve regulated sealed lead acid) comes in two different forms: AGM and GEL. So which kind did you buy? GEL is always more expensive and since you said cheap, then I assume you bought AGM...but you said not to buy...

If you read this entire thread, you will see that OP seemed to only want to order online. SS replied to him and in this thread that while 10 panels minimum is what is listed on their website, if you call them, they will be happy to reduce that minimum to 4 panels but will warn them that they...

I read through the very long thread about SS. I came to the conclusion that SS is very upfront - their business mission is to sell to DIY'rs cheaper than anyone else. They do that like any company would do - by cutting costs elsewhere. Hiring and training more customer service reps is probably...

This question is one I also had for a long time and while each user's situation may dictate a more favorable series vs parallel vs hybrid S+P, this is what finally helped me better understand what's going on: If you connect in series and your battery only needs 12.5 - 14.6V to be charged, the...

Do you care to share more info on the batteries you bought? I mean without naming the brand, where did you buy them? Let's say it's a popular brand like Battleborn or SOK, but you bought them from seller "gud-batteries-4u" on ebay (I made that user id up), instead of the manufacturer directly or...

Thank you. Yes, I saw that formula too, I was just doubting that I had it all figured out properly, even with such a simple formula. This helps a lot to realize our 200Ah AGM bank is barely enough to get by without risking over-discharging. I see LiFePO4 in our future :) as we can't physically...

Thank you! That was about the same number I was coming up with.

OK - sorry for the rookie question which I'm sure is beat to death, but I could use some feedback as to whether my math is correct. I want to know that if I use X watt hours in an AC device, then how many Ah are being used from the 12v battery? My killawatt meter measured my 120v fridge...

Yes, I have a NOCO Gen2 20A charger. It's a "smart" charger. It has four leads - 2 for each battery. I don't fully understand it, but it charges both batteries individually (at max 10A each) and since they are both connected I think it somehow knows that they are also connected in parallel.

I'm getting the battery voltage readings from the charge controller (Renogy 30A Rover), hard to get probes into where the batteries are. But yes, I'm going to re-check and re-do the cabling to rule that issue out. What I'm gathering is that perhaps this big of a voltage drop isn't exactly...

Ah - okay - thank you. I keep getting my math confused. It's more draw than I had calculated. Today I found a new math that confuses me less for calculating amp draw from the battery - AC watts divided by 10. So 1300W/10=130A draw from the battery. It's a bit more conservative which is always...

System is 2x100Ah 12v AGM batteries (bought new 2 years ago, stored unused properly/regularly trickle charged but not constant, only installed in the camp trailer last week), 2000W Renogy inverter. Under a rather heavy load (hairdryer), pulling 1300W, voltage on the batteries drops from 13.6...

Sorry, I wasn't more clear. I mean "makes sense for the price" = $250 is a reasonable price for an AGM 100AH battery. Of course LiFePO4 makes more sense in terms of longevity/charge cycles, but that's not what I meant.

I too saw Will's teardown video - this is the only $300 (or less) LiFePO4 battery with actual functioning low temp cutoff protection. In the last few days, the price has gone from $349 to $249 for the 100AH model. However, it seems all the reviews refer to their AGM lead acid model, which makes...