From: sciencescot@gmail.com   
      
   On Tuesday, 9 July 2019 01:14:46 UTC+1, Scottish Scientist  wrote:   
   > On Monday, 8 July 2019 23:26:51 UTC+1, Jim Wilkins  wrote:   
   >    
   > > On Monday, 8 July 2019 04:21:21 UTC+1, ads  wrote:   
   > > > On Sun, 7 Jul 2019 16:34:14 -0700 (PDT), Scottish Scientist   
   > > >   
   > >    
   > > Here's the text configuration page for row D.   
   > >    
   > > Wind, solar, storage and back-up system designer   
   > > - hide quoted text -   
   > > Configuration text page.   
   > >    
   > > Daily Usage of Energy: 4 KWh   
   > > Solar Power Capacity: 2.64 KW   
   > > Solar Capacity Factor: 8%   
   > > Solar energy per day (average): 5.07 KWh   
   > > Storage Energy Capacity: 4.48 KWh   
   > > Back-up power: 0.093 KW   
   > >    
   > > So 3KW of solar panels, 4 of your 12V105Ah batteries and a 100 Watt    
   > > generator if you can find one that small, would do that, if that's all    
   > > you need to get you through your power outages?   
   > >    
   > > ------------------------------------------------------------------------   
   > >    
   > > I don't understand that. If the batteries are fully discharged in    
   > > calm, overcast winter weather a 100W charge would take 50 hours at    
   > > 100% efficiency. 4 KWH per day is 167W continuously.   
   > >    
   > > I sized my home made fast charger for my APC1400 sine inverter's two    
   > > series 12V 105Ah batteries for 25A at 28V. A full recharge would take    
   > > at least four hours if the batteries could be permitted to rise above    
   > > float voltage and generate hydrogen. As-is the current at constant    
   > > float voltage starts to drop when they reach 70-80% charge. I'm hoping    
   > > a week at no more than 80% SOC followed by equalization outdoors won't    
   > > hurt them too much.   
   >    
   > Let's assume for the sake of argument that the system specified is designed   
   for winter and on an average winter day, the solar panels (together with any   
   wind turbine, though none are specified in the configuration quoted) generate   
   5KWh.   
   >    
   > 5KWh on average but supposing however that it is a particularly bad day for   
   generating - very overcast - and the solar panels only generate half of what   
   they normally generate of a winter's day - only 2.5KWh, that's a bit over 100   
   Watts on average.   
   >    
   > The back-up power of 100W is on full blast so that day it generates 100W x   
   24h = 2.4KWh   
   >    
   > So the total generated that day is 2.5 KWh + 2.4 KWh = 4.9 KWh and the   
   system is generating 200 Watts+ - on a bad day.   
   >    
   > So depending on the starting conditions and the demand profile, the system   
   could supply the maximum usage of 4 KWh and add 0.9 KWh of energy to the   
   battery.   
   >    
   > Sure if you want to impose unusual circumstances, like you start at night,   
   only solar power but at night there is none, there's no wind generators to   
   take advantage of any wind, and the batteries start at flat and you want to   
   run a 1 KWh heater for 4    
   hours at night and use no power for the next 20 hours, so still technically   
   you are only wanting to use a maximum of 4KWh a day, then under those very   
   unusual circumstances the system will fail to meet the specified demand.    
   >    
   > That's why you have an emergency stand-by legal generator burning   
   fossil-fuels, for those worst-case scenarios.   
   >    
   > But in most expected generating and starting conditions and demand profiles   
   the system can supply the maximum daily usage specified, no problem.   
   >    
   > The configuration quoted above was a row D configuration.   
   >    
   > The row H configuration allows for much faster energy store charging from   
   back-up power - in just 9 hours.   
   >    
   > If a faster battery charge from back-up power is your thing and you don't   
   mind the back-up power providing a majority of the energy consumed by the   
   system and providing more of a "base-load" than a "back-up" then you might   
   want to look at a Row H    
   configuration.   
   >    
   > Wind, solar, storage and back-up system designer   
   > Configuration text page.   
   >    
   > Daily Usage of Energy: 4 KWh   
   > Solar Power Capacity: 0.8 KW   
   > Solar Capacity Factor: 8%   
   > Solar energy per day (average): 1.54 KWh   
   > Storage Energy Capacity: 1.34 KWh   
   > Back-up power: 0.149 KW   
      
   It is past my bed-time and my typos are coming thick and fast.   
      
   Corrections.   
      
   "a 1 KW heater for 4 hours at night"   
   "an emergency stand-by legacy generator burning fossil-fuels"   
      
   Right I am off to bed!   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)