Solar Electrics

31st August :: ML V=12.83 :: Y=310Wh
30th August :: ML V=12.83 :: Y=440Wh
29th August :: ML V=12.83 :: Y=290Wh
28th August :: ML V=12.85 :: Y=560Wh
27th August :: ML V=12.86 :: Y=380Wh
26th August :: ML V=12.88 :: Y=340Wh

25th August :: ML V=12.62:: Y=1.23KWh
24th August :: ML V=12.58 :: Y=970Wh
23rd August :: ML V=12.79 :: Y=1.02KWh

22nd August :: ML V=12.81 :: Y=540Wh
21st August :: ML V=12.82 :: Y=440Wh
20th August :: ML V=12.83 :: Y=480Wh
19th August :: ML V=12.83 :: Y=460Wh
18th August :: ML V=12.83 :: Y=350Wh
17th August :: ML V=12.83 :: Y=360Wh
16th August :: ML V=12.87 :: Y=340Wh

15th August :: ML V=12.69 :: Y=760Wh
14th August :: ML V=12.82 :: Y=780Wh
13th August :: ML V=12.89 ???? :: Y=1.20KWh
12th August :: ML V=12.44 On computer at dawn :: Y=770Wh
11th August :: ML V=12.82 Slept early :: Y=420Wh
10th August :: ML V=12.87 Away for the night :: Y=1.02KWh
9th August :: ML V=12.83 Away :: Y=900Wh
8th August :: ML V=12.79 No load over night as away :: Y=970Wh
7th August :: ML V=12.79 No load over night as slept early. The diff between 12.79 and 12.82 may be due to being on float at 14.65 rather than Abs at 14.95 meaning 500w less charge?? :: Y=1.17KWh
6th August :: ML V=12.82 :: Y=1.25KWh
5th August :: ML V=12.48 Watching movies most of the night :: Y=1.71KWh
4th August :: ML V=12.75 :: Y=1.71KWh
3rd August :: ML V=12.75 :: Y=1.50KWh
2nd August :: ML V=12.81 ??? This high of 12.81 is odd as all load was used the night before. The only other aspect is that the charge was a continuous 14.95 ± due to the consistent but variable cloud :: Y=780Wh See http://unveiled.info/index.php/solect/charging/battery-power-charging?page=3
1st August :: ML V=12.65 Left computer on all night, screen off :: Y=1.33KWh

An obvious thought is that a larger battery requires a larger charge. First however it is important to note that apart from common usage applied to AA and AAA batteries, for example, the word means a collection of units working together, as in a battery of guns.

Battery Cells: Nominal Voltage
Electrically chargeable cells that are used to form batteries range from a nominal voltage of between 1.2 and 2 volts. AA and AAA are 1.5v, Lithium Ion and Lead Acid are 2v. The common Lead Acid battery, used to start a car, is 12v; comprising six 2 volt cells connected in series (end to end).

Power Available: Amp Hours x Volts
Batteries have an amp hour rating which is shown on each battery be it single or a collection of cells. The label may show a value such as [48Ah] in the case of a car battery or [1500mAh](1.5Ah) on a rechargeable Lithium Ion. This figure is a measure of how much charge the battery can release over a given period of time, the most common period is 20 hours called the [20 hour rate]. And unless a battery displays an alternative rate it is assumed it is the 20 hour. So a 48Ah 12v battery has ten times more power than a 48Ah 1.2v.

The power in a battery is roughly Ah x V and in a 48Ah 12v battery is 576 watts or 0.576Kw. In comparison to mains electricity that is enough power to run a one kilowatt single bar electric fire for just over half an hour or a 50w laptop for just under 12 hours. However power output is not linear to load applied, as the quicker a battery is discharged the less efficient it is, hence the 20 hour rate parameter.

The 20 hour rate means that it will produce 48Ah at 12v only if the current drawn is constant and by calculation, at a nominal voltage of 12 that would 4 (48/12). It would power a 48 watt (12v x 4a) load for 12 hours and whereas a lighter load of 24w would run for over 24 hours a larger load of 96 watts would not run for 6 hours. The differences in the power obtained from the 20 hour rate in the examples above are not likely to be huge but the rates of discharge can be much greater. For instance some times I may use only 1 watt when running a single LED for reading but 400 watts when using an electric drill.

The lower the rate of discharge the more efficient the battery is and the less damage that occurs in a complete cycle of charge and discharge thereby extending the number of times that a battery can be recharged, varying from a few hundred to a few thousand.

Charging > Page 2

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31st July :: ML V=12.75 :: Y=1.46KWh
30th July :: ML V=12.79 :: Y=590Wh
29th July :: ML V=12.55 ??? :: Y=500Wh
28th July :: ML V=12.74 :: Y=1.06KWh
27th July :: ML V=12.55 ??? :: Y=770Wh
26th July :: ML V=12.68 :: Y=1.50KWh
25th July :: ML V=12.64 :: Y=1.48KWh
24th July :: ML V=12.74 :: Y=1.36KWh
23rd July :: ML V=12.59 Left computer, router and camera on all night :: Y=890Wh
22nd July :: ML V=12.64 :: Y=1.47KWh
21st July :: ML V=12.68 :: Y=1.03KWh
20th July :: ML V=12.63 :: Y=1.51KWh
19th July :: ML V=12.72 :: Y=1.74KWh
18th July :: ML V=12.73 :: Y=510Wh
17th July :: ML V=12.71 :: Y=640Wh
16th July :: ML V=12.70 :: Y=720Wh

Away from 13th to 15
15th July :: ML V=12.71 :: Y=320Wh
14th July :: ML V=12.71 :: Y=320Wh
13th July :: ML V=12.63 :: Y=470Wh

12th July :: ML V=12.64 :: Y=1.32KWh
11th July :: ML V=12.70 :: Y=650Wh
10th July :: ML V=12.52 :: This low morning voltage may be due to running the fridge all day and the charge never reaches 15.** v :: Y=1.32KWh

9th July :: ML V=12.69 :: This is a low morning voltage given there was no use last night. Compare to 5th and 2nd July :: Y=1.44KWh

8th July :: ML V=12.59 :: This lower than usual morning voltage may be due to the more gentle charging and will continue such for a while. :: Y=1.56KWh

7th July :: ML V=12.69 :: Y=1.35KWh Set ABS to 14.95 with no disturbance from a short heavy load that would reset to BULK as I often do

6th July :: ML V=12.82 :: Y=1.73KWh
After 44 days, (6 weeks +) Topped up electrolyte with two cells was just showing the plates. Lowered ABS voltage to 14.95. Although I had taken account of the temperature I had not reduced the charging routine much and was disappointed to find some cells verging on damagingly low levels. Should write a bot about charging routine when voltage drops after FLOAT and then rises to below ABS bit stays at 14.65 if ABS at 14.95 or in winter 15.4 and 15.64

5th July :: ML V=12.91 Little use last night :: Y=1.40KWh
4th July :: ML V=12.70 :: Y=760Wh
3rd July :: ML V=12.74 :: Y=1.22KWh
2nd July :: ML V=12.91 Away for the night. :: Y=840Wh
1st July :: ML V=12.85 :: Y=930Wh

Bought D26500K for £199.95 to level and match 100mm joist beams
From D&M Tools, Twickenham. 02088923813 (Lee)
Made in Czech Republic

DeWalt 01753 567055 of Stanley Black and Decker

30th June :: ML V=12.87 :: Y=1.76KWh
29th June :: ML V=12.91 Will add view on this high value, due to lack of use or more likely charging routine. :: Y=1.74KWh
28th June :: ML V=12.75 :: Y=1.71KWh
27th June :: ML V=12.70 :: Y=1.63KWh
26th June :: ML V=12.73 :: Y=1.64KWh
25th June :: ML V=12.78 :: Y=1.50KWh
24th June :: ML V=12.83 :: Y=1.81KWh
23rd June :: ML V=12.74 :: Y=1.82KWh
22nd June :: ML V=12.70 :: Y=1.79KWh
21st June :: ML V=12.81 :: Y=1.57KWh
20th June :: ML V=12.55 :: Y=550Wh
19th June :: ML V=12.66 :: Y=610Wh
18th June :: ML V=12.82 :: Y=570Wh
17th June :: ML V=12.82 :: Y=500Wh
16th June :: ML V=12.83 :: Y=500Wh
15th June :: ML V=12.67 :: Y=540Wh
14th June :: ML V=12.75 :: Y=1.27KWh
13th June :: ML V=12.79 :: Y=1.23KWh
12th June :: ML V=12.67 :: Y=1.09KWh
11th June :: ML V=12.79 No use after sunset :: Y=1.40KWh
10th June :: ML V=12.63 :: Y=1.45KWh
9th June :: ML V=12.65 :: Y=1.73KWh
8th June :: ML V=12.66 :: Y=1.41KWh
7th June :: ML V=12.67 :: Y=620Wh
6th June :: ML V=12.69 :: Y=1.26KWh
5th June :: ML V=12.75 :: Y=780Wh
4th June :: ML V=12.56 ??? Why so low? Ah! left the camera on all night :: Y=700Wh
3rd June :: ML V=12.74 :: Y=1.46KWh
2nd June :: ML V=12.64 :: Y=1.22KWh
1st June :: ML V=12.63 :: Y=790Wh

**Feb 5th**
On charge for 36hours off before that for two days on before that for two days.
**Feb 10th** Brought back from Gavin's after two days of charge V=12.63
**Feb 11th** 09:50 On charge at 15V ±but frequent heavy cloud :: Charged all day 1.03Kw/3
**Feb 12th** 08:52 On charge Abs 15.62
**Feb 13th** 00:10 V=12.26 :: 09:47 :: No load V=12.51 :: 09:53 On charge V=13.9
**Feb 14th** 01:00 V=12.78 :: 10:46 :: No load V=12.73 :: 21:00 V=12.69

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