guente02:
Hello house.

So i got 2x 24v 150ah blue carbon lifepo4 batteries both connected in series to my 48v 5kva hybrid inverter. The problem now is that it seems that one of the batteries depletes fast than the other, I'm getting a voltage difference of up to 0.4v. I reached out to my installer and he came and hooked up one active battery balancer like but its doubt its doing a good job of keeping packs balanced.

To the experienced guys in the room, how do I fix this issue? The setup is still brand new and if this persist, I plan calling the installer to get me a replacement because I suspect both batteries aint got the same capacity.

Cheers

some lithium bms don't like being in series, and some manufacturers strongly warn against this.

2ndly, the balancer he installed may not be able to do much, as balancers work best at cell level, not pack level.

3rdly, I would recommend, you find a way of individually charging both packs full...to 95% to 100%....then reconnecting them back .

any idea of what bms is inside the pack?.. can you communicate with the bms to see cell level status/information about individual cells

some lithium BMS don't like being in series, and some manufacturers strongly warn against this.

Yeah, the manual suggests so but also contradicts itself about it at the same time.

3rdly, I would recommend, you find a way of individually charging both packs full...to 95% to 100%....then reconnecting them back.

I'll try this out.

any idea of what BMS is inside the pack?.. can you communicate with the BMS to see cell level status/information about individual cells

No idea whatsoever and there is no external connectivity to the BMS, a letdown for a 360k battery.

I do not know that such an unholy mix of panels in parallel is kosher but you will affirm it works for you so I guess that ends the matter.

380w in 7s config + 280w in 9s config running together in parallel - I am fairly sure that is not the operating mode the panel manufacturers and high VoC designer had in mind

ojeysky:


My CC allows for 2 mppt input so here is what it looks like:

Mppt1 390w X 8 of Risen all in series
Mpp2 380w X 7 is also all in series and then it runs in parallel with 280w X 9 sunfit which is all in series as well.

I could only achieve the above because it's a high Voc CC that I use.... You will need to check your cc max Voc to plan

If OP can charge the 2 packs separately with a 24v charger things may work. After getting the 2 batteries to thesame SoC, you will need to lower your max charge voltage so the battery with higher voltage does not run into error and raise your LVD so that the lower voltage battery is not overdrained. All these if your inverter has flexible config.

Best bet long term is to switch to a 24v inverter or buy 2 units 24v smart chargers so that each battery pack can charge to full as/at 24v - in this scenario you set the 48v inverter max charge voltage at a level below what the 24v chargers will be doing so that the chargers finish the charge process and not the inverter.

All in all this is a case of subpar design from the get-go. I wish the OP luck sorting this one out. For BMSs to work well in series, they will need comms between them.

earthrealm:


some lithium bms don't like being in series, and some manufacturers strongly warn against this.

2ndly, the balancer he installed may not be able to do much, as balancers work best at cell level, not pack level.

3rdly, I would recommend, you find a way of individually charging both packs full...to 95% to 100%....then reconnecting them back .

any idea of what bms is inside the pack?.. can you communicate with the bms to see cell level status/information about individual cells

sirs, please help out. Thanks.

oliyeniun:
Hello house, please is it true that this amarom quanta has 10years warranty because someone wants to sell this to a friend of mine and said it is even better than tubular.

Then this MPPT too. Please any one used it before and can give review on it? Many thanks.

oliyeniun:
Hello house, please is it true that this amarom quanta has 10years warranty because someone wants to sell this to a friend of mine and said it is even better than tubular.

Then this MPPT too. Please any one used it before and can give review on it? Many thanks.

false at the bolded. the best u can get is 2yrs,though depending on usage, it can last up to 4 or 5yrs.

thats a mid range CC. if u are looking for something slightly better, go for fangupsun or epever

Much appreciated feedback Oga Valto. God bless your knowledge.

Valto:
false at the bolded. the best u can get is 2yrs,though depending on usage, it can last up to 4 or 5yrs.

thats a mid range CC. if u are looking for something slightly better, go for fangupsun or epever

NiyiOmoIyunade:
I do not know that such an unholy mix of panels in parallel is kosher but you will affirm it works for you so I guess that ends the matter.

380w in 7s config + 280w in 9s config running together in parallel - I am fairly sure that is not the operating mode the panel manufacturers and high VoC designer had in mind

Hehehe.... well when there is a situation one has to make do.... getting the cumulative Voc of each string to be close to one another was the major task and 7s9s formation was the best work around.

ojeysky:


How many do you need? I still have 4 units of brand new 280ah Eve cells available for 80k each

Sold

What about the string current? A parallel connection forces the 2 series strings to operate at thesame string voltage - any way I look at it one of the 2 strings has to be performing below nameplate current - likely to be the larger 380w panels running below their rated current.

ojeysky:


Hehehe.... well when there is a situation one has to make do.... getting the cumulative Voc of each string to be close to one another was the major task and 7s9s formation was the best work around.

ojeysky:
I have got 2 brand new BMV 712 with temp sensor for grabs. 125k each

Q/A
Is this the victron BMV 712 with Bluetooth features?
Yes
Is the price negotiable?
No price is firm Sir/Ma
Does the price include shipping?
No it doesn't, but I can waybill to any part of the country at buyer's cost.

Still available

A correction to valto, the company gives a one year warranty

If well used, it is guaranteed to perform well for two years

oliyeniun:
Hello house, please is it true that this amarom quanta has 10years warranty because someone wants to sell this to a friend of mine and said it is even better than tubular.

Valto:
lolz , u are just noticing, i bought 160w panel as 200w panels, 3yrs ago, i have to spend heavily to return it and another one month to recover my money. the reigning one now, na substandard used panels sold for dead cheap.

Chai! I got two 350W panels some weeks ago. Both connected in parallel and are still unable to charge my 12v 200ah mopower battery full in a day.

mustaphagreens:


Chai! I got two 350W panels some weeks ago. Both connected in parallel and are still unable to charge my 12v 200ah mopower battery full in a day.

350 watts panel will be 24volts.It won't charge your battery if what you have is pwm charge controller.

mustaphagreens:


Chai! I got two 350W panels some weeks ago. Both connected in parallel and are still unable to charge my 12v 200ah mopower battery full in a day.

So many factors can contribute to this, Is your batteries taking full AMPs from the panel, Is your panel Optimized for Best harvest, do you use while Charging, is your controller efficient enough, etc.. you might have Good Panel but consider other factors too

omotoda:


350 watts panel will be 24volts.It won't charge your battery if what you have is pwm charge controller.

It's a 40A MPPT charge controller. The input voltage often reads 28 - 31 volts, output is 12 - 13 volts depending on the charge level of my battery. The set up has never charged my battery full ever since it was installed. Is there a way to check the current produced by the panels?

See attached photos �

Dam5reey:


So many factors can contribute to this, Is your batteries taking full AMPs from the panel, Is your panel Optimized for Best harvest, do you use while Charging, is your controller efficient enough, etc.. you might have Good Panel but consider other factors too

Only my phone and pc are always plugged in while the battery is charging. Max voltage I have gotten is 13v (while on charge), my battery should read 14.4v (I only get this with gen or NEPA) when fully charged. As for the panel orientation I don't know much about it o. How can I check the current produced by the panels?

mustaphagreens:


Only my phone and pc are always plugged in while the battery is charging. Max voltage I have gotten is 13v (while on charge), my battery should read 14.4v (I only get this with gen or NEPA) when fully charged. As for the panel orientation I don't know much about it o. How can I check the current produced by the panels?

This your Controller self, A 12V batteries don't charge at 12V why is yours showing 12V

Ensure the Controller is charging at recommended voltage for your Tubular batteries

mustaphagreens:


Only my phone and pc are always plugged in while the battery is charging. Max voltage I have gotten is 13v (while on charge), my battery should read 14.4v (I only get this with gen or NEPA) when fully charged. As for the panel orientation I don't know much about it o. How can I check the current produced by the panels?

i stand to be corrected. this is a fake mppt. try buy a real mppt Cc as the pwm cc u are using is not good enough for your system.

Valto:
i stand to be corrected. this is a fake mppt. try buy a real mppt Cc as the pwm cc u are using is not good enough.

Looks like it, I suspected the Controller too.. PWM in disguise..

mustaphagreens:


Chai! I got two 350W panels some weeks ago. Both connected in parallel and are still unable to charge my 12v 200ah mopower battery full in a day.

your 12v 200ah will have a total of 1,920 watthours if you deplete your battery to 80% dod.
your solar panels have a combined output of 700w at 24v.
on a good sunny day with a well installed system, you should have a full battery under 4 hrs.

Did you adjust the settings on the CC to your battery type?

Even if it's PWM two 350W panels would charge the 12v fully.

I've a setup with 2 200W panels (24v) and a 12V 200A battery with a PWM and it's full everyday before noon (this dry season) thouh it hardly gets discharged far.

If it's a PWM it would draw the roughly 30 volts from the panel down to 13/12v which would mean the panels operating at about 50% capacity (from my observation).

Upgrading your inverter and battery to 24v to match the panels would work best for PWM systems.

mustaphagreens:


Only my phone and pc are always plugged in while the battery is charging. Max voltage I have gotten is 13v (while on charge), my battery should read 14.4v (I only get this with gen or NEPA) when fully charged. As for the panel orientation I don't know much about it o. How can I check the current produced by the panels?

Valto:
i stand to be corrected. this is a fake mppt. try buy a real mppt Cc as the pwm cc u are using is not good enough for your system.

Wow. So it's the charge controller �. I will have to return it. What mppt charge controller do you recommend, pls?

gadgetplanetng:
Did you adjust the settings on the CC to your battery type?

Even if it's PWM two 350W panels would charge the 12v fully.

I've a setup with 2 200W panels (24v) and a 12V 200A battery with a PWM and it's full everyday before noon (this dry season) thouh it hardly gets discharged far.

If it's a PWM it would draw the roughly 30 volts from the panel down to 13/12v which would mean the panels operating at about 50% capacity (from my observation).

Upgrading your inverter and battery to 24v to match the panels would work best for PWM systems.

Are yohako cc's mostly fake? I use a 40A yohako mppt charge controller.

See the attached photo.

GeorgeD1:


your 12v 200ah will have a total of 1,920 watthours if you deplete your battery to 80% dod.
your solar panels have a combined output of 700w at 24v.
on a good sunny day with a well installed system, you should have a full battery under 4 hrs.

I never get a full charge. Is my charge controller fake?

chris81964:
For sale used 250 W panels. 5 Mono and 4 Poly's. 55k each

now 3 mono's, 4 Poly's 250 W panels and one 300 W mono panel. PRICE DROP 40k each

mustaphagreens:


Are yohako cc's mostly fake? I use a 40A yohako mppt charge controller.

See the attached photo.

I'm just assuming it's PWM, Chinese have a habit of branding pwm as mppt (and hiding the fact that it's PWM deep somewhere)

mustaphagreens:


Wow. So it's the charge controller �. I will have to return it. What mppt charge controller do you recommend, pls?

it might not be totally down to the cc, your settings might be wrong too. however if you have to opportunity to return it and get a real mppt pls do. as for good brands. fangupsun, epever, even powermr is good enough.
how much did u buy this clone

..

Valto:
it might not be totally down to the cc, your settings might be wrong too. however if you have to opportunity to return it and get a real mppt pls do. as for good brands. fangupsun, epever, even powermr is good enough.
how much did u buy this clone

45k

.

gadgetplanetng:


I'm just assuming it's PWM, Chinese have a habit of branding pwm as mppt (and hiding the fact that it's PWM deep somewhere)

OMG , I will return it but I would like to confirm that the panels are without fault too. Is there a means to measure the current going into the system from the panels?