Loadshed problem advice please





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  1. #1

    Default Loadshed problem advice please

    With the stage 4 in place and stage 5 or 6 looming:

    I find that my two linked 102AH batteries feeding 12v supply to 1 000W inverter do not recharge fully between outages.

    So after three or four outages I can no longer draw power from the system without harming the batteries due to pulling them down too far.
    When fully charged we get through up to a 4 hour cut without problems.

    That is using a mains battery charger and a 90W solar panel through a controller to re-charge.
    Even on a fully sunny day they do not bring that batteries up to full charge in time for the next cut.
    When cloudy then of course it is even worse.

    So now my question:

    Do I buy additional batteries or another solar panel or what ?

    It seems to me I just need to re-charge at a faster rate ? Maybe a more aggressive charger ?

    Obviously (at least in my case) cost is critical.

    I am sure many others will be experiencing similar issues.

    Any suggestions from our forum fundies ?
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  2. #2
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    Default Re: Loadshed problem advice please

    The problem is both ways, you will need more batteries to last the longer outages but you will definitely need more panels to get them charged. For your current problem you will have to add more panels in parallel to get more amps in the battery. It would also help to buy 24v panels then they charge with less sun.
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    Default Re: Loadshed problem advice please

    More panels = faster charge
    Bigger batteries means less discharge as a % of capacity, but that doesn't matter, you still need more panels.

    Your controller must just be able to handle the extra Watts and then of course the batteries must be able to handle the faster charge.
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  4. #4

    Default Re: Loadshed problem advice please

    Which controller are you using,.make and model?
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  5. #5
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    Default Re: Loadshed problem advice please

    Do you have the model details for the charge controller, then we can try and give better advice.

    Edit: sorry, seen its already asked - my phone takes forever to refresh
    Last edited by SAND; 2019/03/21 at 02:55 PM.

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    Default Re: Loadshed problem advice please

    I don't understand this bit:
    "That is using a mains battery charger and a 90W solar panel through a controller to re-charge."
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    Default Re: Loadshed problem advice please

    Quote Originally Posted by jelo View Post
    I don't understand this bit:
    "That is using a mains battery charger and a 90W solar panel through a controller to re-charge."
    Sounds like a typical camping setup.
    When mains is available, the charge controller will charge from there, if no mains is available, it will revert to the PV panel to charge.

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    Default Re: Loadshed problem advice please

    Quote Originally Posted by jelo View Post
    I don't understand this bit:
    "That is using a mains battery charger and a 90W solar panel through a controller to re-charge."
    May not be applicable in this case, but a modern proper inverter / controller can accept both solar, mains and/ or gennie charge, being able to differentiate and control all 3. Mains first plus solar, then when mains fail, solar only, when batteries become depleted, will start gennie or request you to start gennie, if no auto starter
    Last edited by julius caesar; 2019/03/21 at 04:09 PM.
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  9. #9
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    Default Re: Loadshed problem advice please

    Your mains charger should be 20A so that both batteries can get fully charged after a 50% DoD. To charge fully from solar you will need about 250w of panels and about a 20A Solar Charger. The problem here is that mains charging and solar charging at the same time will be too high.
    Rather just leave the solar as is at 90w and use a 20A mains charger.

  10. #10
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    Default Re: Loadshed problem advice please

    My take would be to increase the charging rate but it is already very high. Longer term this will shorten the life of the battery. With this in mind I would not increase the charging rate any further by using a bigger solar panel. If you go to a 2nd battery I would suggest you look at the SMF100 100Ah being sold by Battery Centre. Going at below R2 000 depending on the discount you get.

    If you have a 2nd battery then we can look at increasing the charge rate. I have mentioned the 12V 7A intelligent chargers before. They cut off to a trickle charge (13.6V) as soon as the battery is full. These chargers can be used in || to boost the excisting charge rate and at about R150 adding 2-3 of them is far cheaper than a bigger panel provided our loadshedding is of such a nature that we get a few hours grid between shedding. One can also charge the 2nd battery by these chargers when disconnecting it from the other one to ensure each battery is properly charged and only re-connect the 2 batteries in || at loadshedding time.

    If a 24V system is used via a charge controller one will also have to connect and re-connect back to 12V.
    It is still important to know what solar controller is being used to know the present charge rates.

  11. #11
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    Default Re: Loadshed problem advice please

    Quote Originally Posted by jelo View Post
    I don't understand this bit:
    "That is using a mains battery charger and a 90W solar panel through a controller to re-charge."
    Both the mains battery charger solar charge controller is connected to battery..

    So in effect getting charge from mains and panel.

    I utilise this with my PWM controller, which follows the SOC of the battery.

    After bulk charge is finished I remove the mains charger
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    Default Re: Loadshed problem advice please

    Quote Originally Posted by Peter1949 View Post
    Do I buy additional batteries or another solar panel or what ?

    It seems to me I just need to re-charge at a faster rate ? Maybe a more aggressive charger ?
    What are you using now?
    Johan Kriel

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  13. #13

    Default Re: Loadshed problem advice please

    https://www.victronenergy.com/blog/2...r-pwm-or-mppt/

    Maybe its the controller that needs a rebook at...read link above.
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    Default Re: Loadshed problem advice please

    Quote Originally Posted by Shade View Post
    https://www.victronenergy.com/blog/2...r-pwm-or-mppt/

    Maybe its the controller that needs a rebook at...read link above.
    Peter as yet to identify his charge controller.
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    Default Re: Loadshed problem advice please

    is it ok to run multiple chargers on a battery bank?

    In Peter's case the mains charger and Solar. In my case 20amp dumb charger and 5 amp smart charger?
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    Default Re: Loadshed problem advice please

    Quote Originally Posted by Quiksilver View Post
    is it ok to run multiple chargers on a battery bank?
    At times it could be risky. I once blew up a very nice pure sine when I connected a real cheapo modified sine to the same battery. Since then I am very careful and would only try with a nearly full battery and a low rating fuse for both chargers when testing.

  17. #17

    Default Re: Loadshed problem advice please

    Wow guys - thanks for all the info.
    Still dark outside now and about to hit the next shedding.
    I will check the details re controller, battery type and inverter detail and post later when back on line.
    Thanks a lot for all comments so far.
    Answering the call of the wild is just so much beter than answering the telephone.
    ISUZU KB 280 DT LE NOW POWERED BY THIS AMAZING COMMUNITY
    Modified Glider Hunter trailer fitted with RTT.
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  18. #18
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    Default Re: Loadshed problem advice please

    Its category One today going to 2 at 09h00 so you will be better
    Last edited by Peter Betts; 2019/03/22 at 06:39 AM.

  19. #19
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    Default Re: Loadshed problem advice please

    Quote Originally Posted by SAND View Post
    Sounds like a typical camping setup.
    When mains is available, the charge controller will charge from there, if no mains is available, it will revert to the PV panel to charge.
    sounds dodgy to me
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  20. #20
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    Default Re: Loadshed problem advice please

    Peter I have a 105 amp hr Deltec deep cycle battery for you if you want it.

    I bought it in December, but the battery wasn't the problem.

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