• 05|May

    Morning Low ::12.63 | < 12.63 | < 12.39     Yield :: 1.54K | 1.01K | 610 || 600 | 320 | 160

    31st May :: ML V=12.77   Y=1.23KWh :: Checked electrolyte no uncovered cells and used less than 2 LT
    30th May :: ML V=12.7?Y=940Wh :: 12.77 Check electrolyte
    29th May :: ML V=12.70Y=450Wh :: 12.77 Check electrolyte
    28th May :: ML V=12.77Y=1.33KWh :: 12.77 Check electrolyte
    27th May :: ML V=12.71Y=1.20KWh :: 12.77 Check electrolyte
    26th May :: ML V=12.77Y=580Wh :: 12.77 Check electrolyte
    25th May :: ML V=12.72Y=1.18KWh
    24th May :: ML V=12.64Y=1.15KWh
    23rd May :: ML V=12.75Y=1.26KWh
    22nd May : ML V=12.75Y=490Wh
    21st May :: ML V=12.74Y=510Wh
    20th May :: ML V=12.58Y=1.52KWh
    19th May :: ML V=12.66Y=1.56KWh
    18th May :: ML V=12.63Y=820Wh
    17th May :: ML V=12.66Y=720Wh
    16th May :: ML V=12.64Y=1.59KWh
    15th May :: ML V=12.62Y=1.90KWh
    14th May :: ML V=12.64Y=1.93KWh
    13th May :: ML V=12.66Y=1.94KWh
    12th May :: ML V=12.59Y=1.69KWh
    11th May :: ML V=12.57Y=1.64KWh
    10th May : ML V=12.64Y=1.71KWh
    9th May :: ML V=12.59Y=1.34KWh
    8th May :: ML V=12.59Y=1.09KWh
    7th May :: ML V=12.58Y=1.26KWh
    6th May :: ML V=12.58Y=1.52KWh
    5th May :: ML V=12.66Y=1.56KWh
    4th May :: ML V=12.43Y=1.70KWh
    3rd May :: ML V=12.60Y=1.07KWh
    2nd May : ML V=12.39Y=940Wh
    1st May :: ML V=12.66Y=570Wh
  • 04|April

    Morning Low ::12.63 | < 12.63 | < 12.39     Yield :: 1.54K | 1.01K | 610 || 600 | 320 | 160

    30th April :: ML V=12.86 Y=870Wh Given ML @ 12.86 checked electrolyte, just caught a few cells used about 2Lt and turned charge down to 15/14

    29th April :: ML V=12.79Y=780Wh Given ML @ 12.79 better check electrolyte.
    27th Y = 1770 Use =160 | 28th ML =12.61
    28th Y = 710 Use = 60 | 29th ML = 12.79
    29th Y =780 Use =50 | 30th ML =12.86

    28th April :: ML V=12.61Y=710Wh
    27th April :: ML V=12.64Y=1.77KWh
    26th April :: ML V=12.79Y=590Wh Given ML @ 12.79 better check electrolyte
    25th April :: ML V=12.66Y=1.39KWh
    24th April :: ML V=12.67Y=790Wh
    23rd April :: ML V=12.71Y=1.20KWh
    22nd April : ML V=12.63Y=1.58KWh
    21st April :: ML V=12.64Y=1.90KWh
    20th April :: ML V=12.67Y=1.87KWh
    19th April :: ML V=12.64Y=1.85KWh
    18th April :: ML V=12.65Y=1.68KWh
    17th April :: ML V=12.64Y=1.34KWh
    16th April :: ML V=12.41Y=800Wh
    15th April :: ML V=12.59Y=880Wh
    14th April :: ML V=12.63Y=820Wh
    13th April :: ML V=12.64Y=1.01KWh
    12th April :: ML V=12.83Y=1.21KWh Battery 3 plates were exposed. Reduce charge voltage
    100ml average battery cell top up.

    11th April :: ML V=12.83Y=2.04KWh Given ML @ 12.83 better check electrolyte
    10th April :: ML V=12.71Y=1.62KWh
    9th April :: ML V=12.74Y=740Wh
    8th April :: ML V=12.59Y=1.55KWh Low ML due to fridge being on yesterday !?
    7th April :: ML V=12.79Y=1.14KWh
    6th April :: ML V=12.78Y=1.74KWh
    5th April :: ML V=12.78Y=540Wh
    4th April :: ML V=12.62Y=920Wh
    3rd April :: ML V=12.64Y=1.45KWh
    2nd April : ML V=12.72Y=1.15KWh Only one solar panel connected until 10am GMT
    1st April :: ML V=12.60Y=1.39KWh Only one solar panel connected today
  • 03|March

    Morning Low ::12.63 | < 12.63 | < 12.39     Yield :: 1.54K | 1.01K | 610 || 600 | 320 | 160

    31st March :: ML V=12.60   Y=1.92KWh
    30th March :: ML V=12.64Y=1.73KWh
    29th March :: ML V=12.54Y=1.87KWh
    28th March :: ML V=12.58Y=1.79KWh
    27th March :: ML V=12.64Y=1.90KWh
    26th March :: ML V=12.59Y=2.02KWh
    25th March :: ML V=12.51Y=1.73KWh
    24th March :: ML V=12.50Y=1.75KWh
    23rd March :: ML V=12.51Y=360Wh
    22nd March : ML V=12.51Y=600Wh
    21st March :: ML V=12.52Y=350Wh
    20th March :: ML V=12.52Y=460Wh
    19th March :: ML V=12.69Y=1.27KWh
    Checked battery electrolyte level and all plates were covered. Added approx 2.2Lt 90ml per cell
    The ML drops : see https://unveiled.info/solect/specific-gravity-1

    18th March :: ML V=12.78 :: Y=560Wh Given ML of 12.78 will check battery electrolyte level
    17th March :: ML V=12.51Y=1.32KWh
    16th March :: ML V=12.58Y=220Wh
    15th March :: ML V=12.66Y=280Wh
    14th March :: ML V=12.51Y=460Wh
    13th March :: ML V=12.39Y=1.36KWh Incubator lamp all night
    12th March :: ML V=12.44Y=610Wh Incubator lamp all night
    11th March :: ML V=12.44Y=1.41KWh Incubator lamp all night and day
    10th March :: ML V=12.43Y=1.21KWh Incubator lamp all night
    9th March :: ML V=12.47Y=670Wh Incubator lamp all night
    8th March :: ML V=12.44Y=440Wh Incubator lamp all night
    7th March :: ML V=12.47Y=1.35KWh Incubator lamp all night
    6th March :: ML V=12.36Y=430Wh Incubator lamp all night
    5th March :: ML V=12.48Y=510Wh Incubator lamp all night
    4th March :: ML V=12.30Y=840Wh Incubator lamp all night
    3rd March :: ML V=12.48Y=190Wh
    2nd March :: ML V=12.62Y=460Wh
    1st March :: ML V=12.50Y=890Wh
  • Old ELF setup


    Fri 7th I connected one panel, via the Steca Controller, to one old battery. Used it as load battery and measure a use of 10Ah total.

    Could see from the Steca the Asus 900 uses 1 amp

    Sat 8th Since then I have 2 old 50w panels connected via the Steca to one old battery. The other old battery I have topped up with water, which was a bit iffy as it was a sealed battery. The six cells needed about a litre so hardly surprising it/they were almost unrechargeable.

    That battery as end of day on the 9th was rated as 52% charged, by the next morning is was 48%

    Switched old battery. Bat I received 25Ah charge via Steca and was at 80% when disconnected.

    Connected two old panels and one new REC max charge rate was 4.4 of 6.8 generated? Will fill with water tomorrow.

    Bat 2, filled with water 2 week ago, was at 3% charged at connect. It rose to 12% at sunset, 15% by 2100 hours and 18% now at midnight. 19% at 0100 How ??????

    At 0900 theSoC reads 23%??? and now at 1200 the sun is up but it is overcast 0.6A charge, 12.8v Soc 25%

    Tue 2nd Dec 1140 Soc 54%

    Jan 1st 2015 Soc 61% however the battery seems to be discharging quite rapidly down from 80% two days ago. I should check there are blocking diodes in the each of the two panels.
  • Hydrometers Intro

    I have ended up buying two hydrometers. I first called Plymouth Battery Centre who informed me they had a glass model at £19 which I thought was a bit expensive so when I went to town I thought I'd look around before I took the mile or more walk to Prince Rock.

    The Toolshed could get a glass model for £5 and the car shop next door had the same model for £2.99, which I bought. When I went to the Plymouth Battery Centre to buy some red and black covered multi-core cable I decided to buy the hydrometer they had anyway, which cost £14.50 eventually.

    The better model from Plymouth battery Centre is the one on the left, although you cannot see the coloured scale. It is supplied by Gordon Equipments under the name DURITE model 0-070-00 ; range 1.15 to 1.40; accuracy 0.01. All parts are individually replaceable.

    The difference in readings is notable.

    Concerns regarding the cheapo

    1. The float diameter is much smaller than the container diameter so the readings are at an angle.
    2. On the side of the container the float rests, the surface tension of the acid draws the liquid further up the side of both, giving a distorted view.
    3. The scale is on the small side so not so easy to read.
    4. And of course there's the idea that the calibration is off.
  • Battery Resistance

    For lead Acid Batteries

    There are two processes where the battery resistance will change.

    a) The normal operation of charging a battery will increase it's resistance, whilst removing sulfation, and the resistance will drop as sulfation occurs. This follows the formula that V=I × R.
    With a constant current (I) the battery charges the voltage (V) rises. Is simple terms as an equation must balance then if one side increases then so must the other. So if V rises then I &times R must also rise and of I is constant then R must rise. The reverse is the case when the battery discharges.

    b) Although sulfation and de-sulfation are the normal reactions in a lead acid battery sulfation can become ingrained and not subject to being processed by normal charging. In this case the battery appears charged and has a high resistance. To overcome this, or at least to try to, a high voltage can be applied in an attempt to force the sulfate to return to the electrolyte.