EpEver ,an 6415 volts vs MPPT

I'm having some trouble finding this information... But I was wondering

The EpEver 6415 AN suggests a maximum of 2, 60 cell solar panels in series when used with a 12 volt battery Bank... It suggests that a single 60 cell unit would be ideal... Citing a VOC of less than 38 volts per panel

However... I have been running three panels in series for quite some time... It works out to around 100 volts DC

But I'm wondering is how would I know if the unit was actually in MPPT?

I know that typically there is an MPPT range. I'm not clear on is if there is an MPPT range relative to the Target battery voltage? It's certainly been charging... That much is true... But I feel like I've oftentimes seen significantly less amperage going into the batteries then I expect...


I'm wondering if the unit is going into PWM mode and burning off the excess perhaps?

I don't know a lot about PWM aside from I would never intentionally use one

If I recall with a PWM charger you feed the power from the solar panel in and it steps down by pulsing, the voltage drops but the amps remain the same? Therefore meaning that the higher the voltage of the solar panel is in relationship to the battery voltage, the more power is effectively wasted

With these three panels I should see an absolute maximum (barring extremely low temperatures) of about 750 watts, so about 55 amps at 13.6 volts

But I rarely see more than 33 amps which works out to about 450 watts... Which is about 60% of the panels rated power (250w x 3)

I don't know... It's probably just heat soak but it just got me thinking

Mppt is a mppt and not a pwm.
So your mppt will never run in pwm.
Its how its make inside


For the rest its how your panel set which angle
Flat you always lose some watts (can go up to 40% lost)

One panel do about 6.5 amps .
So in serie its stay 6.5 amps but your volt go up.
So your mppt is working or it stay on 6.5 amps.

Parallel your panels wil do 20 Amps.

And wy you have 100volt on a 12 volt battery?
Just set your panels parallel.
38 volt will do the job just fine on a 12volt systeem

Suijkerbuijk said:

Mppt is a mppt and not a pwm.
So your mppt will never run in pwm.
Its how its make inside

Click to expand...

I don't think you are correct

Suijkerbuijk said:

For the rest its how your panel set which angle
Flat you always lose some watts (can go up to 40% lost)

Click to expand...

My angles are near perfect this time of year

Suijkerbuijk said:

One panel do about 6.5 amps .
So in serie its stay 6.5 amps but your volt go up.
So your mppt is working or it stay on 6.5 amps.

Click to expand...

Yeah I would agree with that

Suijkerbuijk said:

Parallel your panels wil do 20 Amps.

And wy you have 100volt on a 12 volt battery?
Just set your panels parallel.

Click to expand...

Well... 30 or so amps at 30+ feet would call for at least 10 gauge wire... I had 14 gauge on hand

Suijkerbuijk said:

38 volt will do the job just fine on a 12volt systeem

Click to expand...

Yep it would... But that's not what I am doing... I'm tempted to try it just for chits and grins

ericfx1984 said:

Epever charge controller dropping out of MPPT mode

I have 2 Epever 40 amp tracers panels are connected in series per controller (2x300w panels) charging a 400amp Lifpo4 battery bank. Its cloudy today sometimes the sun comes out from behind the clouds but it seems when the light dims they will drop back from MPPT mode to PWM mode, once I...

diysolarforum.com

I don't think you are correct


My angles are near perfect this time of year


Yeah I would agree with that


Well... 30 or so amps at 30+ feet would call for at least 10 gauge wire... I had 14 gauge on hand


Yep it would... But that's not what I am doing... I'm tempted to try it just for chits and grins

Click to expand...

Again a mppt is not a pwm .
It can go in a pwm mode if the battery is full but really its just the float function that work like that .
Its still not a pwm controller .

Here you can read the different and how it function.

Suijkerbuijk said:

Again a mppt is not a pwm .
It can go in a pwm mode if the battery is full but really its just the float function that work like that .
Its still not a pwm controller .

Here you can read the different and how it function.

MPPT vs PWM - the differences and how to choose

At present, there are two main technical routes for controllers: pulse width debugging (PWM) method and maximum power point tracking (MPPT) method. Each method has its advantages and disadvantages and can be selected according to different scenarios. Today we will introduce their characteristics...

www.tycorun.com

Click to expand...

I know how MPPT versus pulse with modulation functions... I think you may be misunderstanding what it is I'm trying to get information about... You're dropping basics... I'm looking for something a little bit more than that.

I'm well aware that it's not a pulse width modulation controller... But I also know that the MPPT has a certain range at which it will function, you can be lower or higher than that range and still charge but it won't be an MPPT mode

Thanks for trying to help, but I think we might have some type of language barrier perhaps

My epever and others on the forum have had it drop into pwm mode when voltage is below 20-21v but I've never attempted the high end of voc nor have I seen any reports of it, not to say it isn't happening. You could try taking one panel out of the series and check if the remaining two are displaying the same behaviour, typically voc is the more important value as over amperage generally just gets clipped rather than damaging the unit, could you source another of the same panel to use 2s2p? I can take a look at the manual when I'm more awake and possibly give you a more concrete answer.

ThaiTaffy said:

My epever and others on the forum have had it drop into pwm mode when voltage is below 20-21v but I've never attempted the high end of voc nor have I seen any reports of it, not to say it isn't happening. You could try taking one panel out of the series and check if the remaining two are displaying the same behaviour, typically voc is the more important value as over amperage generally just gets clipped rather than damaging the unit, could you source another of the same panel to use 2s2p? I can take a look at the manual when I'm more awake and possibly give you a more concrete answer.

Click to expand...

I have 40 of them... So yes I can.

ericfx1984 said:

I have 40 of them... So yes I can.

Click to expand...

ROFL ok well like I said I'd try the two in series rather than 3 if the test comes out ok and the voltage isn't clipping the charge then go for 2s2p there will obviously be some losses but it's likely going to be better than it dropping into pwm

ericfx1984 said:

I'm having some trouble finding this information... But I was wondering

The EpEver 6415 AN suggests a maximum of 2, 60 cell solar panels in series when used with a 12 volt battery Bank... It suggests that a single 60 cell unit would be ideal... Citing a VOC of less than 38 volts per panel

However... I have been running three panels in series for quite some time... It works out to around 100 volts DC

But I'm wondering is how would I know if the unit was actually in MPPT?

I know that typically there is an MPPT range. I'm not clear on is if there is an MPPT range relative to the Target battery voltage? It's certainly been charging... That much is true... But I feel like I've oftentimes seen significantly less amperage going into the batteries then I expect...


I'm wondering if the unit is going into PWM mode and burning off the excess perhaps?

I don't know a lot about PWM aside from I would never intentionally use one

If I recall with a PWM charger you feed the power from the solar panel in and it steps down by pulsing, the voltage drops but the amps remain the same? Therefore meaning that the higher the voltage of the solar panel is in relationship to the battery voltage, the more power is effectively wasted

With these three panels I should see an absolute maximum (barring extremely low temperatures) of about 750 watts, so about 55 amps at 13.6 volts

But I rarely see more than 33 amps which works out to about 450 watts... Which is about 60% of the panels rated power (250w x 3)

I don't know... It's probably just heat soak but it just got me thinking

Click to expand...

Looking at the manual now voc of 3 panels shouldn't be an issue I'm wondering if it's one of epevers weird charging characteristics they have a weird thing with bulk charge reconnect voltage that could be possibly causing it but it's a question that's sadly above my pay-grade I'm afraid.

Do you have any telemetry for the unit? Ive seen weird reports of similar instances that charging increases during morning and evening when the panels voltage is lower.

ericfx1984 said:

I know how MPPT versus pulse with modulation functions... I think you may be misunderstanding what it is I'm trying to get information about... You're dropping basics... I'm looking for something a little bit more than that.

I'm well aware that it's not a pulse width modulation controller... But I also know that the MPPT has a certain range at which it will function, you can be lower or higher than that range and still charge but it won't be an MPPT mode

Thanks for trying to help, but I think we might have some type of language barrier perhaps

Click to expand...

Its in the Manuel
I see sometimes 17 volt (22 volt ) on my solar panel input.
And i have a good charge from it .
So really its about 3volt dat the mppt do his work and make what i can make on that moment.

If i set my panels in serie than i see somting stupid.
My amps go down with the same panels .
Well the volt go up (out put amps go down)
I have test that on the same day and time just to see the performance
So i think personal that if you have more than dubbele the volt it can not handel it and it can not use it .
I think that is the reason in my epever manuel its tell me on 12 volt only 2 panels serie .
An by 24 volt 3 to 4 panels in serie .
My normal save input is 120volt and a max of 150 volt.

I have 3x100watt panels on 22 volt
So i have test it on 22 volt , 44 volt and 66volt input.
And in my case the best performance is on 22 volt on 44 volt its almost the same and on 66volt it drop down the performance

I do have to say lipo4 vs lead battery the charge profile its different and with that in mind the performance will be different to .

I do have to say i had charger problem on 13.5 volt that it go really fast in slow charge wel the battery is on 80% so i have change it to 14 volt and i do a full charge till it hit that volt (Float charge)