Solar Power Off-Grid Battery Bank Testing - Discharge

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1. can you do a revisit on this video as youtube has removed the audio track.
2. I love your videos but I can only watch for a short period of time because the motion makes my stomach queasy.  Please use a tripod.  
   Anyway thanks for the videos.  
3. make the video over and talk and tell us about the batterys. or edit it somehow so you can talk on the video with no music
4. wouldn't it be easier to test by simply pushing the select button on the bogart trimetric meter one time and going to the battery bank % of charge? that is where I leave my meter setting.
5. How long does it take to charge this set of 4 to 100% on average? And how many watts of solar panels do you have?
6. Also, my inverter (a Trace Engineering SW4024) has several fixed steps in the ratio of transformation, such that output voltage vary somewhat with input voltage. As input voltage drops off, subsequently higher transformation ratios will be selected. So output voltage will gradually drop (during discharge) to a point, then jump up when the next ratio is selected, then continue to again drop gradually, and so on. This may explain why you were sometimes getting higher output power readings. 
7. Realize that, in order to determine state of charge from open circuit voltage, the battery must first stand idle for 24 hours. This allows the specific gravity of the electrolyte adjacent to the plates to equalize with that in the rest of the cell. 
8. youtube.com/user/trojanbatteryco super charles rotterdam nl
9. is it ok to use 3 12 volt battery to a 24 volt solar panel?
10. these are apparently the batteries of choice for a lot of people for solar setups but since they are not AGM and they are not deep cycle batteries either i presume and are flooded batteries and need maintenance how often do you have to top off the acid to keep them running good?
11. So quick question, unless I'm missing something, which is absolutely possible....Shouldn't you test the bank with out power coming in from the panels? Your vid shows voltage coming into the bank while you are trying to measure bank capacity.
12. 8 hours at 20 Amps is 160 amp hours. The battery should be left in an open circuit condition for about 30 minutes to allow the chemistry to reach equilibrium before reading the voltage. It looks like the camera was turned off for some time and then it came back on to read the battery voltage, but this rest time was not specified in the video. Also most voltage charts are for 25C ambient temperature so you may need to compensate for that to find true state of charge.
13. Remember that the inverter is supplying a constant amount of electrical power to a constant load. Power = voltage x current so as the battery voltage falls, the inverter (Assuming it maintains a constant output voltage at all times) must draw more current to meet the power demand of the constant load.
14. The clouds very close to the sun act like a mirror that concentrates the light onto the panels and surrounding land. Also, the clouds that are not so close to the sun are scattering white light instead of the fainter blue light scattered by oxygen and nitrogen. So, in a sense, it's like the sun got bigger, or your panel became a hundred miles wide but with a much lower efficiency because the clouds scatter the light in all directions.
15. amps rise as battery volts drop...when charging. But when drawing power from a battery, lower voltage through a constant resistance would mean current would have to fall..ohm's law. Something else must be going on. Maybe the door was opened, the room got cooler, the light bulbs were cooled somewhat and lowered the resistance, therefore drawing more current.
16. Let me pose a problem that I need solved. I see people taking s small stand up freezer and putting a Ronco controller on the thermostate to turn it into a efficent fridge.For example an off grid couple on you tube found that the daily draw on a stand up fridge was 2000 watts. They moved over to the freezer which is half the size of the fridge for a draw of 140 watts due to cold air being heavy .They did not put R-10 around the freezer and plywood for a lower watts usage. Could you do 
17. I can't watch this, I mean he is actually going to test his bank of batteries with snow on the ground. hahaaha
18. 14 seconds in you have the neg. lead on the lower right battery.At 45 seconds you have the neg. lead on the lower left battery.Any reason for the change? This neg lead (ground) comes from the charge controller with a neg lead (ground) from the charge controller to the power inverter.Correct? Just confirming your wiring.
19. He got 8 hrs at 22A from fully charged to half empty. He said he did not want to go less than 50%. Seems like his battery is ok. 
20. So you got about 8 hours at 11A from fully charged to near empty? That's 88Ah from a 250Ah rated battery. Shouldn't you conclude that it's faulty and you should be sending it back? I've tested several makes of deep-cycle batteries and concluded that they lie about the amp-hours. I've also found that they don't hold up for anything like the number of cycles stated (for a given depth of discharge). My four 250A-h 48V Elecsol 12V give 40Ah after 2 yrs (they say 1000+ cycles).