DIY solar power forum (1 Viewer)

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therium

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This forum is great for beginners and advanced hobbyists alike. It was created by Will Prowse, who runs a Youtube Channel with many videos of how-to and reviews of products related to off-grid and solar power, including "solar generators", which are not generators at all, they are just a battery pack with an invertor but all in one unit. Will started off living in his own RV and just got his first home in Oct 2019.

I learned some interesting things like:
  1. You cannot charge lithium batteries if the temperature is below 32F. So how do Teslas (which use lithium batteries) get charged in the winter?
  2. You can get cheap lead acid batteries for a solar battery bank if you ask the store for "old stock". A $150 battery might only be $29-49usd.

Free Forum: https://www.diysolarforum.com/index.php
Will's Youtube channel: https://www.youtube.com/user/errolprowse
 
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Pucksterguy

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I'm gonna look into this. I have a solar system at camp.
 
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Lila

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You cannot charge lithium batteries if the temperature is below 32F. So how do Teslas (which use lithium batteries) get charged in the winter
Batteries of all kinds drain very quickly at low temperatures. We saw this all the time in the mountains so kept any vital batteries close to our chests (literally).
 
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Pucksterguy

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It'll be rainy and overcast most of the week. I'm gonna need the genny to run a few days to top up the batteries. On a sunny day it will charge at 45 amps. Only about 10 amps when it's cloudy.
 

Lila

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Cool that you get that much even when it's cloudy.
 

Pucksterguy

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I want to create a solar farm near my house. I have a question how to calculate solar PV area?
your gonna have to ask an expert. Mine was set up to run a small cottage. I run a refrigerator a computer and LED lights. Anything with a heating element is verbotten. I run 4 250watt panels 6 batteries and the necessary electronics to make the system work. Power is fed into the breaker panel then distributed thru the house.
 
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therium

therium

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I have a question how to calculate solar PV area?
You calculate the number of solar panels you need based on what voltage and amps you want to put into your battery system in the worst seasons, like winter when the sun does not produce much light (in the northern hemisphere). So if your battery system needs 14 volts (to charge a 12vdc system) and you want to put 40 amp hours into it each day, you look for solar panels that do that. So if a solar panel outputs 10amp hours on a cloudy day, at 14 volts, you would need 4 panels.

Size of the PV panel doesn't matter, it's electrical characteristics does, as characteristics for panels vary greatly via several variables, like the type of solar cell it uses (monocrystalline or polycrystalline), how sunny it is, the angle of the panels to the sun (sun's rays must strike the panels at 90 degrees), how dusty the panels are, etc. Even rain can leave minerals and dust on the panels when it dries, but that depends on where you live. Rain starts out as pure H2O but picks up particles of dust as it falls through the air.
 

Alain

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i saw also if not mistaken that there are also exemplares that can turn dependant on the season
 
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