Topmost11:
Thanks all. You have all spoken from your various wealth of experience. A difference of opinion is what facilitate learning. Don't let us have a dogmatic opinion; it doesn't help development. I have read all but have not digested.
Someone should pls review the conflicting opinions and find a common ground which you can all still review. If possible and the means available, experiment on the postulations and give your findings. Then we can all update our knowledge. The Einsteins of this world made name by challenging the stats quo.
I got here by challenging myself daily. The person that introduced me to inverter technology is now my neighbor. Isnt it funny that he still burn fuel via generator daily while my generator has been idle for some time now yet I have light 24/7. He recently got a sunking 60 for 34K while i built something slightly bigger for half the price for my mum, with your help via your answers. That is the power of an open mind.
Pls let's criticize constructively.

My 4×150watts panels are currently wired in parallel to a powmr mppt cc and still using the 12v inverter. The yield seem lower than when I was using pwn cc. That was why i contemplated series wiring. But I guess that is due to the incessant rains. If rain is not the culprit, I shall revert to pwm cc for the time being while I brainstorm on what next.



"you should try and stick to system voltage, ie 12v panel, 12v CC, 12V INVERTER
MPPT, YOU ONLY LIMITING FACTOR IS CC max input voltage"

The above is my understanding before all this differences in opinion.

PS: Sorry for my long essay

SolnergyPower:
Oga, I yield up to 20A instantaneously from 4 panels of 150W connected in 2S1P in a 12V setup.

Forget what you read in the books and do the experiment.

Besides, the manufacturer that rated Max PV input of 12/24V PWM to be 50V isn't stupid

Penuelseun:
Yes, me

ceaser:


So guys, talking of timers, can something of a sinotimer be connected between the battery and the inverter for some form of automation? I wonder if it will not amount to inverter damage if the timer effectively repeatedly connects and disconnects battery supply to the battery terminals of the inverter rather than the factory way of using the switch of the inverter, bearing in mind the fact that the AC load is already primed/switched on to start in all these scenarios.

Thank you.

Topmost11:
Thanks all. You have all spoken from your various wealth of experience.

My 4×150watts panels are currently wired in parallel to a powmr mppt cc and still using the 12v inverter. The yield seem lower than when I was using pwn cc. That was why i contemplated series wiring. But I guess that is due to the incessant rains. If rain is not the culprit, I shall revert to pwm cc for the time being while I brainstorm on what next.

tivta:

Any issues? Like static sound or lines on the tv?

Penuelseun:
No issues, been using it for more than 3 years. I use a bluegate ups by the way, I use it to power my 40" led tv, ceiling fan, home theater, decoder at a go and it powers them well.

earthrealm:


therein lies your problem, you are treating your mppt as a pwm, that is why your harvest is poor. i suggest you run 2s2p, ie hook up 2 panels in series. then parallel the 2 strings in series.
ie you would have 2 strings each made up of 2 strings in parallel, which you then parallel, thus ur CC wud be seeing 24v to 38v, thus enough head room for your CC to truly shine, as thats the sweet spot for it. efficiency upto 90% or so.
another option would be to string all 4 panels in series, efficiency of this setup is about 82% or so, what is the Vmax of your CC?, cos that is the determinant of if you can use this option or not.

@dragnet. , His subsquent remarks, shows he knows its mppt

dragnet:

ojesymsym:
Are you sure of this your number 2? We are dealing with a pwm charge controller and not an mppt.

I think you are wrong. If they are 2 panels and the system voltage is 12v the panels have to be connected in parallel not series.

dragnet:
what model please?

Topmost11:



"you would have 2 strings each made up of 2 strings in parallel, which you then parallel"

Is this what you mean?

zeestone99:


The guy never jam pwm controller . No be only Voltage headroom

Penuelseun:
No issues, been using it for more than 3 years. I use a bluegate ups by the way, I use it to power my 40" led tv, ceiling fan, home theater, decoder at a go and it powers them well.

Topmost11:



"you would have 2 strings each made up of 2 strings in parallel, which you then parallel"

Is this what you mean?

tivta:

Wow. I thought it was modified sinewave, can you please post a picture of it, I want to get your type.

SolnergyPower:
Indeed! Oga, take your time and take a second look at what I claim.

My claim is a personal experience in the last 6 months or so.

zeestone99:


Sorry boss....please show us practical example, this new development interest lot of us. Gracias

SolnergyPower:
Sir, where exactly in my claims do you need understanding?

zeestone99:


I thought you were saying we could go above system voltage using a pwm controller. If yes, I have experimented and all I got was the overload alarm.
What type of pwm controller did you use.

If no pardon my intrusion pls

SolnergyPower:
Overload alarm? You may be talking definitely about something else.

What I wrote was, as long as the PWM Charge Controller allows for it, I will always input as much voltage as I can from the PV.

This means, for a PWM that allows for up to 50V from the PV, I can do a series connection for two 150W, Voc, 22.05V in a 12V battery bank as against doing a parallel connection. From experience, the series connection has yielded me more harvest than a parallel connection.

I have come across MPPT charge controllers that ONLY allow matching PV voltage closely with the battery bank voltage.

Like I have always noted, I will always aim at the roof for a PWM as long it is allowed.

Thank you sir.

earthrealm:



Yeah, exactly!
You would hit over 25amps on a good day, if your panels are optimally placed and you are using correct cable size as per distance

zeestone99:


Yeah pv overload.
Interesting to know you have used two panels in series to charge a 12v battery and it worked like an mppt. Please share the pwm controller. I will love to do some experimenting myself. Gracias.

Topmost11:



Battery, inverter, panel=12v:
Controller is 12v/24v most.
With this recommended connection, won't I be having 24v which is against the system voltage? Or is it the advantage of mppt?

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SolnergyPower:
Here is what I have.

a. 12/24V Roy Solar PWM
b. 4 x 150W ForeSolar Mono Panels in 2S1P
c. 16mm cable from panels to CC. About 15m or so
d. 12V, 850VA Sukam Inverter
e. 2 x 12V, 165Ah PowerCycle Batteries.

SolnergyPower:
Overload alarm? You may be talking definitely about something else.

What I wrote was, as long as the PWM Charge Controller allows for it, I will always input as much voltage as I can from the PV.

This means, for a PWM that allows for up to 50V from the PV, I can do a series connection for two 150W, Voc, 22.05V in a 12V battery bank as against doing a parallel connection. From experience, the series connection has yielded me more harvest than a parallel connection.

I have come across MPPT charge controllers that ONLY allow matching PV voltage closely with the battery bank voltage.

Like I have always noted, I will always aim at the roof for a PWM as long it is allowed.

Thank you sir.

JUO:
I have it in stock

Oshomo12:


Let me help out a bit. Ur 4*150w=600w @ 12v ABI?
So if ur panel orientation and cables are rightly "placed". @eff of 80%, u should not get anything less than 35A at 14.2v. anything less than that, u re running at a very big loss with ur connection. Just parallel the four panels and revert to the house(to share the good news)!