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By what indication did you determine them to be fully charged? That is not fully charged. How much time with what charger/how many amps for how many hours?

I've found this calculator useful for finding charge current of different panels and configs. https://www.midnitesolar.com/sizingTool/

Dude! Grow up... All you're doing is sitting up there in your gold plated high chair flinging your own feces down on the rabble. Nobody cares....

Many, many tests done by Andy (Off grid garage) show that at 3.4 volts/cell the battery saturating to a full state is inconsistent, even with lengthy absorption times. 3.45 or 3.5 as a constant voltage charge results in a fully saturated battery always. At 3.45 absorption time needed to be a bit...

Look at the name of this forum. D I Y = Do It Yourself. It seems to ME that you are asking on the wrong forum. You say you're designing a utility scale solar project but asking pretty basic foundational questions in your post. Do they have Google in India?

Applies to lead acid, not this chemistry. Lifepo4 are rated to 80% state of life (capacity) after 3000 or 4000 or 5000 cycles. Zero SOC to 100% SOC = one cycle. If you only discharge to 50% per day, then full recharge, that is one half of one cycle. So theoretically you're extending the number...

Overkill are JBD.

6 Mwh in the last 12 months from 5.9 kw used panels. $900. Sharp 235 and Trina 255.

My opinion: Physical damage caused during assembly by over torque. A reasonable amount of torque is not a measured value of torque. Quite easy for Big Man hands to over torque what should be 4 or 5 newton meters. The internal attachment over torque value of the terminals is 8 Newton meters. Over...

I am able to see hi, low, and average cell voltages from a JBD BMS in Solar Assistant. Edit .. oops, sorry I cut off the bottom

I, too, am looking forward to seeing this through with you. Thanks for sharing. My only worry so far is keeping a wary eye toward temperature management. It gets pretty cold in the north woods.

I have done something similar. Inclination matching latitude. 3 strings pointed 155⁰ and 3 strings pointed 205⁰. I sacrifice absolute peak power at 12: 20 p.m. ( my solar noon) for a wider production curve. The array wakes up earlier and lasts longer in the afternoon. All 6 strings to a 6 to 1...

The most recent update provides setting capacity for the gas gauges. Settings, battery, advanced button. It's not a platform issue. There are 5 tabs in Solar Assistant. 4 of them scroll the page header and address bar off the top. It's just the 'Graphs' page that doesn't behave this way. And I...

DO NOT put washers between the busbars and cell terminals. I believe your problems are all tied to the sloppy connections on the top of this battery. If you want to configure a battery by paralleling cells and only using one BMS, your interconnects must be perfect (and yours are not) or the...

My setup is the same. Split phase MPP 3048. On one inverter I have 3S6P using a 6-1 combiner. Awg8 from there to inverter. 60 feet. On the other inverter (charger) I have 3S2P wired direct using branch connectors and Awg10. Each charger is independent of the other. You don't need to match...

Provided it's a 12 or 24 volt battery, I see no problem.

For me, the primary purpose of restraining the cells is to prevent the natural swelling from putting strain on the terminals at the busbars.

MY 2 Overkill/JBD don't work like yours. The shunt in MY BMS' do a fine job of displaying SOC. Mine read gradual changes while charging all the way to 100%. They generally reach hundred before the batteries are finished absorbing energy but they sit there for that last 8 to 10 minutes of...

And a bit rude.

Here's why I didn't bother.

Read the manual. I'm unfamiliar with Growatt nomenclature in settings, but on my MPPSolar units, to achieve your goals, I would use a setting called solar utility battery. (SUB). Your answer is in the settings.

Most (if not all) the prismatic cells have black as the positive and most (if not all) power supplies have black as the negative. Just pay attention and say it out loud right before you connect the power supply cables to the live cell terminals. "Red is positive black is positive, red to Black."...

Then why are Lilo and my Life included? Seller is a moron.

I don't understand this statement. If you take one panel off each string you should be fine no matter where in North America you travel. 27x4=108 voc < 145 max. 23x4=92 vmp is between 60-115.

If using these modules for a home 'powerwall', DO NOT store inside your house. Build an outbuilding for them. These are cobalt chemistry and thus are susceptible to thermal runaway. Otherwise known as real hot fire.

Using bus bars as the interconnection point for everything. Batteries, to the bus bar. Inverters, to the bus bar. Chargers, to the bus bar. Bus bars circled in picture. Blue Sea Systems 2127 250 Amp MaxiBus BusBar with 4 studs https://a.co/d/7bNNP0S

I put a Kill a watt meter on my 6000 btu window unit and measured 6.4 kWh over a 24 hour period. Just fyi

This was your failure.

Hmm. Panels Imp is 17.48 amps. Inverters max input current per input is 12 amps. Plus, MPPT voltage range is 150-550 6 panels at 23v is 138 These two pieces of hardware don't seem particularly well matched.

Wrong. Current/loading can and often does expose poor connections.

Electrical power is pulled by the load (pump) not pushed by the source. Think about it this way. Your laptop power brick is rated for 65 Watts. But it's plugged into an outlet that can provide 1800 watts. It will only draw up to its maximum 65 Watts from the 1800 watt source. Likewise, you're...

It's not the Watts you need to worry about it's the open circuit voltage. What is the VOC of these panels? Why a 6S battery? Absolutely no one in the world builds a 6S battery except you. Why did you do that? Virtually all of the off-the-shelf consumer grade solar equipment assumes a 4s, 8s, or...

Roughly speaking... 67.5A * 13.5v = 911w / 160w = 5.7 panels / 4 hrs = 1.4 panels. In other words... A 160 watt panel aimed perfectly on a standard day should make 600 or so watts in 4 hours. I'd use 3 panels.

Exactly. It shouldn't say zero volts. When it says zero volts something has disconnected the battery from whatever meter it is that you're looking at. You're testing before declaring these batteries bad should be a little bit more sophisticated than you have displayed to date. Edit... But good...

Irrelevant to your problem.

Right ?. The 24k or so chlorinated gallons in my pool. Closed and covered for 8 months of the year.

Yes. Plywood holds the threads of screws better than OSB. Yes. I am suggesting large screws through the Hardi board into the plywood, hit a stud if possible on at least one. Plenty

The three documented, specific testing and analysis that I've seen performed would argue against leaving an active balancer connected full-time. If you top balance a pack, and then discharge that pack, the cells will diverge at the bottom. This is normal. All 16 cells are not exactly perfectly...

At 2.9 volts per cell, you are no longer in the flat part of the discharge curve. From 2.9 to 2.6 volts on my 310ah pack with load would literally only add minutes to capacity. Not worth it for the damage done to the cells. Maybe you should consider building another battery

Ok. Not really helpful because he already owns the equipment. Got anything responsive to the question?

See post number two. Hanging off the batteries.

We don't know that yet. OP hasn't told us what the existing four batteries are

Correct. A pre-configured raspberry pi connected USB to the inverters. No affiliation but I love it. Provides rich data. I have an experimented with power management yet but understand it to be changing output mode from SBU to SUB on a schedule also dependent on SOC.

But he has a 14 kwh battery. 80 amps is fine in the settings of the Growatt.

Just cut off the proprietary connector and crimp on mc4. Or, like i did, remove everything at the junction box on the back of the panel and do whatever you want.

Actually, it depends on how different the orientation is. I have one array pointed at 155°, one array pointed at 205°. These arrays are parallel connected in a combiner box and wired to one mppt. Their output is just fine.

You sort of made my point. 20,000 cycles is 54 years. Yeah, go ahead, you chase that. Me? I'm going to actually USE my batteries before the electrolyte sours with age.

You overvolted the charge controller. Those numbers on the solar panel label are at a given temperature. As things cool off and move below THAT temp, voltage goes up. ½ volt is NOT headroom. In Maryland, 20% is headroom.

... and in this state, add a charger, set to 3.5 or 3.55 and let them sit on the charger until current goes below 0.05C. Just paralleled at 3.3, no matter for how long, absent a charger, accomplished nothing.

Less than perfect connections, inadequate charger to cells cabling. There is 0 (zero) capacity up that high. There is no practical difference between 3.60 and 3.64.

And yet, instead of pursuing your suspicion with the manual you decided to post here. What does YOUR manual (instruction booklet that was in the box with the inverter) say?

Three strings at 155°, three strings at 205°, into a Watts 24/7 six to one combiner box. Works great. Small sacrifice of absolute peak power for a broader parabola of charging. Edit.. to one 80 amp mppt.

Assuming 280ah cells, x8 = 2240 ah. Assuming you charge at 8 amps = 280 hours. Assuming 50% state of charge, about 6 days.

Preferably, set the inverter to cut off from battery before BMS.

Right but if you zoom in on sunshines graph, you will notice that at 13.6 volts it required over 5 hours of absorption to get full. So first it required time to charge to the voltage and then it required five more hours to fully saturate the cells at that voltage 13.6. the sun isn't up for that...

I'm thinking a five cell 18650 holder and a 20 amp 12 volt Buck converter and a cigar lighter receptacle. Search Amazon. 5 minutes produced all those answers. Wire all the cells in series output of the cell holder to the buck converter Buck converter to the cigar lighter adapter. And perhaps...

The original poster stated a 12 volt system... Therefore 40 voc Max

Yes

I agree with all you've said, However, He has an extensive library of almost two dozen battery tests. Charging at anywhere from 3.35 to 3.65 volts. Different absorptions. Quite comprehensive testing. I think it's common knowledge in the community that the two things this chemistry hates is high...

First, not sure why you bought it... That said, you're misunderstanding the words. When you plug in solar assistant raspberry pi, the pi becomes a hotspot. Then, when you look at your phone, and look for available networks, solar assistant is one of the available networks that you can allow...

I would disconnect nothing. Turn off the inverter and any other loads. Connect a charger to the parallel pack, set to 13.8 volts and see what happens. Actually, you'll probably first need to discharge a bit to turn off the protection

It looks like you broke the bolt. Holy Crap! I think you should replace the cell and before it arrives buy a darn torque wrench!

The original question.. They are not going to sit at 365 after top balancing. As soon as you remove the charger, they will come off of 365. However, I didn't see any responses that said do not top balance. You should top balance.

To get real world measurements of plug-in 120 AC items buy a kill-a-watt meter. At least that would educate your guesses.

Why not just parallel all 3 batteries and stay at 12 volts? If you decide to go to 24 volts you will need to buy a different inverter and possibly a new charge controller.

Dude. Everything on the front of that unit is an output. Just re-read what you said... retract my previous message

I don't discharge below 25 volts. I think 23.2 is far too low. But to your question, below that number so that the charger never sees the battery at that equalization setting

No. Your 2 series panels will output together 80 volts at 10 amps in perfect sun. The SCC will convert that 80 volts down into a battery charging voltage. By converting voltage down amps go up. Go here, plug in your numbers and look at charging current line...

For DC, yes Less important for AC. Search 'skin effect in conductors'.

Possible on the temp. I don't know what battleborn sets their BMS at. I think my next step would be verify each panel individually with the pwm

I think you were confusing charging and discharging specifications. A typical discharge test per the spec sheets is usually 0.2 C down to low voltage disconnect at 2.5 volts at 25 C degrees. The 0.05 C tail current that you refer to is on the charge. In constant voltage charging, once the cell...

Yes, that does sound correct. I do similar.

Completely disagree. Cell phone batteries are a different chemistry and behave differently. If you charge lifepo4 above 3.45 volts per cell hold it there for an hour and then disconnect everything and sit them on the shelf after 2 weeks they will settle to 3.35. This is where you should set...

Please clarify what this means. Probably overloading the input of the solar charge controller as previously stated by @Zwy

Because they're not fully charged. Process was imperfect go read that resource that was posted above.

Umm.. 12.8v x 280ah = 3584kwh. You may want to rethink your advice.

Still too small.

Solar Assistant has this functionality.

Single inverter split phase has two inverters inside one box

I have a pair of MPP Solar PIP3048LV-MK in split phase. Flawless for a bit over a year. A little over 5 MWh in that period.

Change your "back to battery" setting one volt higher and see how it behaves.

Check the spec sheet. The graph that describes the cycles to 80% capacity is the one you want. Degradation follows the same curve as a discharge curve. Accelerated degradation at first followed by a long flat (ish) slide.

But he was sold and he paid for 280's.

If the government wants to mandate all these issues on private companies products, why doesn't the state just start its own damn car company.

Right. He wants to pay for an inch and get a mile. The mile is available, he just doesn't want to pay for it. And that's his choice. Belly aching about it isn't going to change it.

They are already. My parallel packs are only identical voltage at 68% SOC and with more than 10 amps charging. At ALL other times,they run 2 or 3 mv apart.

As long as the voltages are close, they will work it out between themselves.

Doesn't matter.

I installed a manual transfer switch many years ago to accommodate a portable generator. My solar system now occupies the space that the generator once did. The manual transfer switch allows me to bring individual circuits on and off the solar system. Particularly useful in beta testing when I...

For me the same reason that some 12 volt batteries are impermissible in series. Ie. renogy batteries. The electronic stuff inside is not rated to take the higher voltage. If it were I think renogy would probably sell those chargers as 12/24 volt DC to DC chargers

I think the discrepancy you've identified is the result of one array facing northeast. On an overcast day, the distribution of solar rays is more uniform. Not from a point source. Therefore, your Northeast pointing array actually produces something. It's not 'daylight' that you derive solar...

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If you're okay buying a solar combiner box, a mid-tier mppt doesn't cost any more than that. Do it right.

Good God. Just let it cycle. Everything will reset on your next full charge. Solar assistant has nothing to do with that by the way. It only reports what it's being told by your inverter and your battery.

You're getting there.. watch closely over the next several hours

I use 55.6 (13.9), 60 minute absorption, and 49 (12.25) as my operating voltage range. There is very little usable capacity outside this range

No. Physics and your settings in the chargers (whether mppt or utility) will determine battery charging. Chargers are responsible for charging. BMS are for ensuring the safety of the battery. I don't understand what these battery BMS to inverter connections accomplish. In my mind they are...

Slightly smaller panels. 255W, VOC 37.1, ISC 8.5. 3s6p. Broken to lower peak but spread the curve across more of the day.

I have the exact same issue using Android. I've reported it to Pierre. Why can't the charts tab header work the same as the other 4 tabs. ie. Scroll off the top of the screen.