Right proportions in FV system

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maxlinux2000
Posts: 9
Joined: Sat Sep 13, 2014 8:38 am
Location: Spain

Right proportions in FV system

Post by maxlinux2000 » Mon Sep 29, 2014 1:01 pm

please read this pdf:
http://freesolarsecrets.com/solarsecrets.pdf" onclick="window.open(this.href);return false;

in my experience I have seen che batteries lead calcium acid have to be charged to 15.4V and lead-antimony / selenium-acid, the 15.2V is enough (as it says lidemann)

the best solar panel is really the Amorphous or Thin Film tecnology, why in the summer the heat does not lower its performance and even in winter and rain we can give a 20% energy.

but I do not agree with lidemann about the right proportions of the various components of a PV system.

In my opinion the ideal is this:

Amorphous panel 100Wp
10A mppt regulator
120Ah-12V battery
100W inverter

With This mini-system we can use 0.24kWh / day even in December.

If we multiply by a factor X10 are:

Amorphous panels 1kWp
Mppt regulator 100A
1200AH-12V battery
1000W inverter

As written above, this system allows nor have 2.5kWh in December, and in July 5kWh.

These proportions are extremely conservative, but this save us to change the batteries for many years.

regardos
MaX
my spanish blog http://www.solarweb.net/blogs/maxlinux2000/
my italian forum http://faidateoffgrid.altervista.org/

techman
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Posts: 1329
Joined: Thu Dec 22, 2011 11:49 am

Re: Right proportions in FV system

Post by techman » Sun Oct 05, 2014 11:35 am

WOW!!! This is incredible information!!! I knew there was something wrong with the common systems we use today.

These guys mentioned in the book are top in their field of study today. I devour all of their materials. I never saw this book before. Thank you!

I need to share this information on my channel.

I can't believe they even promote the harbor freight panels. I remember when I first got my set. They were producing power in all weather conditions. My current 800 watt setup only puts out about.8 watts on cloudy days. This is 1 100th of their rated output.

Whereas the harbor freight panels keep producing power happily all the time.

I will be making some changes in the near future.

Thank you!!!

maxlinux2000
Posts: 9
Joined: Sat Sep 13, 2014 8:38 am
Location: Spain

Re: Right proportions in FV system

Post by maxlinux2000 » Sun Oct 05, 2014 5:05 pm

remeber that this manual is an advertising spot, to sell its solar controller "tesla".

There are 24V amorphous solar cells and therefore can be connected to any PWM controller.
But any mppt regulator input 150V is good.

Anyway you can not mix two different technologies in the same pwm/mppt regulator, so if you buy amorphous plates, note that you must also buy a controller for them.

I have written a small spreadsheet (in Italian) to check whether a system is balanced, and how much energy can be consumed daily.

Please tell me:
how many Wp of solar panels you have,
how many Ah of batteries you have,
which is the voltage is your PV system (12/24/48/96?)
how many watt is your inverter ... with 110V or 220V?

...so i can calculate how many energy you can use for day.
my spanish blog http://www.solarweb.net/blogs/maxlinux2000/
my italian forum http://faidateoffgrid.altervista.org/

techman
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Posts: 1329
Joined: Thu Dec 22, 2011 11:49 am

Re: Right proportions in FV system

Post by techman » Fri Nov 21, 2014 12:38 pm

Sorry for the long delay in getting back to you. I had no extra power for a while now. I am back online again and have more power. Not sure if you follow my videos but you would have seen I had some trouble.

I had 800 watts solar panels
648 AH batteries
solar panels in series for 120 volts open circuit
1500 watt inverter 110 volts

Right now though I only have a 216 AH battery bank

Thanks

maxlinux2000
Posts: 9
Joined: Sat Sep 13, 2014 8:38 am
Location: Spain

Re: Right proportions in FV system

Post by maxlinux2000 » Sun Jan 11, 2015 3:46 pm

hi
sorry to read that you have problems with energy.
I have for you a very inexpensive solution that perhaps can be helpful.

You can easy buid a system 12V-700A batteries with only 300$

It is used 12V batteries-car 50-100Ah, that you can buy at a junkyard for about $ 20 each.

Then you need to connect in parallel with Schottky diodes and recharged to 15.9V

Although this that I say sounds very strange, especially at the much higher voltage, I assure you that it works great.
I have this system running for 4 years with 15 12V-70Ah batteries.
Batteries can not be, all the same capacity. You can mix with batteries 50Ah to 100Ah. But they all have to be car type.
That is not you dare put Trojan batteries 6 + 6V across these from the cars.

This is because the lead alloy is different and car batteries are made, to recharge to 14.5V with 50º celsius (near the engine).
Normal recharging tempreture (20º Celsius) must climb 1V voltage, therefore we must reach 15.5V.

But consider that we have also put diodes, which "steal" 0.4V ... so the solar controller must give 15.9-16V.

I put a link to my Italian forum where I have discussed all that. You can use translate.google.com to understand what I mean.
If you have problems you can write to maxlinux2000@gmail.com

here the last schema
http://faidateoffgrid.com/forum/downloa ... hp?id=4117" onclick="window.open(this.href);return false;

there the battery car discussion
http://faidateoffgrid.com/forum/viewtop ... +risparmio" onclick="window.open(this.href);return false;

here a cheap solar regulator that you can use with this economic system battery
http://faidateoffgrid.com/forum/viewtop ... =68&t=2188" onclick="window.open(this.href);return false;

and if you have a 24-48V system, here a very cheap inverter that work very-very great
you can fount at the same price the 12-24-48V versions.
This inverter is hard to die and in europe is rebranded in germany as "Ective" logotype

http://www.aliexpress.com/premium/sunri ... P=y&catId=" onclick="window.open(this.href);return false;

hoping that can help

regards
MaX
Last edited by maxlinux2000 on Mon Jan 12, 2015 1:22 pm, edited 3 times in total.
my spanish blog http://www.solarweb.net/blogs/maxlinux2000/
my italian forum http://faidateoffgrid.altervista.org/

maxlinux2000
Posts: 9
Joined: Sat Sep 13, 2014 8:38 am
Location: Spain

Re: Right proportions in FV system

Post by maxlinux2000 » Mon Jan 12, 2015 10:08 am

techman wrote:Sorry for the long delay in getting back to you. I had no extra power for a while now. I am back online again and have more power. Not sure if you follow my videos but you would have seen I had some trouble.

I had 800 watts solar panels
648 AH batteries
solar panels in series for 120 volts open circuit
1500 watt inverter 110 volts

Right now though I only have a 216 AH battery bank

Thanks
I forgotten to answer to your question:

with 800Wp of solar panel you can use 1.7kWh per day in winter and 2.6kW in summer
But you need of 850Ah-12V of batteries in order to pass 3 days without sun.
Your inverter is a bit too powerful for the batteries at 850Ah... so better to up at 1000-1200Ah.
if an inverter absorb at the full power for example 150A-12V... you need to connect 10 times of batteries... so 1500Ah for continuous 150A absorbtion.
But if the 150A of absorbtion are ocasionally and for 60seconds... well ...850Ah are enougth.

(supposing that your system is at 12V...itsn't?)
my spanish blog http://www.solarweb.net/blogs/maxlinux2000/
my italian forum http://faidateoffgrid.altervista.org/

techman
Site Admin
Posts: 1329
Joined: Thu Dec 22, 2011 11:49 am

Re: Right proportions in FV system

Post by techman » Sat Jan 17, 2015 10:59 am

I am planning to expand my number of solar panels soon. I am going to start getting a new amorphous solar panel each month to add to my other solar panels. This will improve all weather solar panel output.

I just installed the new forklift battery. This is rated at 750 AH and 12 volts. This is a LOT of power now.

My inverter is there to power small loads. I hardly ever go above 400 watts. Normal days see maybe 100 to 150 watts max with my laptop, monitor and sound system connected to the inverter.

The biggest drains are my laser printer at 400 watts peak surge and my vacuum at 800 watts.

Otherwise my AC power usage is very low.

Recently I have been getting by with a small, cheap 175 watt car travel inverter.

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