• Deficit Cycling

    This is a copy of info at http://support.rollsbattery.com/support/solutions/articles/10376-deficit-cycling

    > Deficit Cycling
    >Modified on: Tue, 26 Aug, 2014 at 4:22 PM
    >Rolls batteries have been designed to provide many cycles and therefore long life. This long life, however, is dependent on the correct charging regime.
    To fully charge a lead acid battery, more ampere hours must be returned to it than have been drawn from it. This is not always possible in Renewable Energy applications as systems may rely solely on the Sun and Wind without backup power (generator/charger). In these instances the battery may not receive a full charge before it is discharged again. If this deficit is not corrected the battery will eventually sulphate and its capacity will deteriorate. To lessen these symptoms it is essential the battery is returned to a fully charged state at least once a month. The battery’s state of charge (SOC) can be checked using a combination of its voltage and specific gravity.
    >If the batteries do not respond to normal charging, a course of equalization* will be required. This is in essence controlled overcharging in order to return the acid back into the electrolyte. Given that the acid is more dense than the water, no noticeable increase in the specific gravity will be noted until the gassing voltage has been reached (2.4VPC) and the two start to diffuse.
    >NOTE: Hydrocaps must be removed during equalization.


  • Email to Wind and Sun


    I have just bought an inverter form Wind and Sun UK, I called them for two reasons

    1) to find out what current the inverter takes when it is switched off and

    2) to say the manual was disappointing


    1) how does switching work as it isn't a power switch that physically breaks and joins the 200A input cables,

    i) What is the rating of the dc input cables?

    ii) How are the input DC cables connected, I imagine there must be some loss?

    iii) Does the power switch, in the off position, just a break in power to a relay, that when on enables the dc circuit to work and connects the DC input.

    2) The manual says very little, maybe there is little to say, but it could state

    i) the load in the off, as above,

    ii) the image in the index is very poor and hardly usable and the one on your website, which isn't mentioned in the manual isn't much better. Could you send me a detailed image or is their one on the website. All I could find is a version of the manual; which I made a screen shot of and enlarged.

    A third matter


    i) The UK 230v socket is upside down and the mains cable blocks easy access to the power switch.
    inverter socket2

    ii)Your image show it the correct way.
    Can I unscrew the body and correct this?

    iii) plus the socket isn't screwed in place and moves around a bit

    4. Finally I am disappointed it is made in China, prior to purchase I though it would be India like the MPPT 75|15

    Thank you

    Roger Lovejoy


    Cc Wind and Sun

    Roger Lovejoy

  • Plymouth Battery Centre CRAP!

    Unit 349-354, Faraday Mill Trade Park | 8:00am-6:00pm
    https://www.plymouthbattery.co.uk/ 01752 227637

    **Some notes on this business.**

    I have spoken to two people mostly, Richard and Marc. My first contact with Richard seemed ok and they agreed to test the capacity of a battery. When I took two in I met with Mark who explained they would test the batteries by discharging and then charging and discharging to see what the capacity is after a full charge. This was late on a Friday. On Sunday I had a missed call to say the batteries were badly sulfated and what did I want to do about it. When I called back I spoke to Richard who didn't have exact details. I was bit put out by this and even more so once I understood he is the son of the guy I used to deal with when it was a small unit some 30 years ago.

    Full story »

  • 03|March

    **31st All 4 Morning Low 12.78V** UL V=12.5
    **30th** All 4 :: 00:55 V=12.67 Morning Low 12.84V 10:30GMT V=12.48
    **29th** All 4 :: Morning Low 12.90V 15:45 Float V=14.05 A=1
    **28th** All 4 :: Morning Low 12.91V Y=280Wh So 280 didn't keep the Voltage at 12.91?

    Pages: 1· 2

  • March 18

    14:50 Automatic update to version 4.4 and MPPT firmware to 1.3

    The update created an anomaly in that the restart created a new day and thereby pushed back all the history by a day. So I have saved the data and cleared the history. So today's history is missing all data before 14:50

  • Mar & Feb 2018

    **15th Mar** 10:25 Morning Low 12.47 I must discover when the low reading is taken as yesterday's now reads 12.32 which was probably just before I kipped out and switched of inverter, computer and lights, but by mistake - left the rooter on all night
    **14th Mar** 10:58 Morning Low 12.74 I haven't properly discovered when the low reading is taken a) just after midnight or b) as soon as the first light is recorded.
    **13th Mar** Charging all day whilst using inverter Y=1.47Wh??
    **12th Mar** Morning Low 12.70 charging ??
    **11th Mar** Morning Low 12.66 charged Y=570Wh
    **10th Mar** Morning Low 12.31 charged Y=760Wh
    **9th Mar** Morning Low 12.50 charging Y=170Wh
    **8th Mar** Morning Low 12.59 charged Y=1.550KWh Inc 3 and 1
    **7th Mar** Morning Low 12.62 charging :: 09:44 15.46v connected Batts 3 and :: 09:52 V=15.44 set Abs to 15.64v
    **6th Mar** Morning Low 12.32 charging :: 09:40 14.6v at 13.6a
    **5th Mar** Morning Low 12.51 Little charge and incubator on all day :: Lowest V=12.24
    **4th Mar** Low 12.35 Charge (Yield = 880w some to Batts 3 and 1) (incubator on all night till Noon)
    **3rd Mar** Low 12.39 (incubator on all night till Noon)
    **2nd Mar** Low 12.36 (incubator on all night till 10am)
    **1st Mar** Low 12.47 (incubator on all night till 10am)

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