Cheapest load-shedding battery solution





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  1. #1
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    Default Cheapest load-shedding battery solution

    Ok, I am now finally getting gatvol re this load-shedding....

    My budget is seriously strained, but this needs to be resolved.

    I found this inverter: https://doodah.co.za/inverters/33809...er_ouput-5000w

    With 2 of those Ecco 120ah deep cycle batteries, it should be enough to keep a few essentials on, right?

    I spent a long time looking, and this is the only inverter I saw that has an AC input.

    This solution appears to offer nearly double the Watts that these of the shelf solutions from Ellies, and a Mecer one I saw as well(battery box on wheels with inverter on top). They are only about 1200 to 1440 watts.
    Too little to run a few laptops, a few extra screens, and the entertainment for several hours.

    Your thoughts?

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    Default Re: Cheapest load-shedding battery solution

    Sorry for my ignorance but what would an ac input be used for?

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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by xsel7 View Post
    Ok, I am now finally getting gatvol re this load-shedding....

    My budget is seriously strained, but this needs to be resolved.

    I found this inverter: https://doodah.co.za/inverters/33809...er_ouput-5000w

    With 2 of those Ecco 120ah deep cycle batteries, it should be enough to keep a few essentials on, right?

    I spent a long time looking, and this is the only inverter I saw that has an AC input.

    This solution appears to offer nearly double the Watts that these of the shelf solutions from Ellies, and a Mecer one I saw as well(battery box on wheels with inverter on top). They are only about 1200 to 1440 watts.
    Too little to run a few laptops, a few extra screens, and the entertainment for several hours.

    Your thoughts?
    Those high Watts inverter on 2x 105Ah batteries is not a good idea.

    105Ah x 2 = 210Ah
    210Ah x 12.8v = 2688Wh
    2688Wh ÷ 2 = 1344Wh usable on Lead-Acid batteries

    1344Wh ÷ 5000W = 16minutes (0.2688hrs) run time

    Rather get a 800W to 1000W inverter/charger to run essentials like internet & LED lights. Will also be cheaper than the 5000W
    Last edited by Monkey-D; 2020/02/09 at 09:03 AM.
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    Default Re: Cheapest load-shedding battery solution

    I can’t see that it has a ac input. Looks more like 2 ac outputs. If there was an ac input that would be used charge the batteries. Can’t see anything about it being able to charge batteries.

    are you looking for an inverter charger combined solution?
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    Default Re: Cheapest load-shedding battery solution

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    Default Re: Cheapest load-shedding battery solution

    There is an IEC kettle plug input on the same side as the fans. It would appear to be a UPS type setup, instead of just a simple inverter.

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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by SAND View Post
    There is an IEC kettle plug input on the same side as the fans. It would appear to be a UPS type setup, instead of just a simple inverter.
    Does this mean it has a built in charger?

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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by Monkey-D View Post
    Those high Watts inverter on 2x 105Ah batteries is not a good idea.

    105Ah x 2 = 210Ah
    210Ah x 12.8v = 2688Wh
    2688Wh ÷ 2 = 1344Wh usable on Lead-Acid batteries

    1344Wh ÷ 5000W = 16minutes (0.2688hrs) run time

    Rather get a 800W to 1000W inverter/charger to run essentials like internet & LED lights. Will also be cheaper than the 5000W
    Argument only holds true if you pull the full 5000W all the time continuously
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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by SAND View Post
    There is an IEC kettle plug input on the same side as the fans. It would appear to be a UPS type setup, instead of just a simple inverter.
    Thanks for pointing out - couldn't see it on my phone.

    Still the price for a 5000 watt pure sine wave with built in charger less than R4k. I wouldn't plug my equipment into that
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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by plunger View Post
    Does this mean it has a built in charger?
    It would appear so. So it functions as a UPS.

    I would advise to check with the supplier before purchase though

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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by Brand2011 View Post
    Thanks for pointing out - couldn't see it on my phone.

    Still the price for a 5000 watt pure sine wave with built in charger less than R4k. I wouldn't plug my equipment into that
    Keep in mind that the 5000W may be peak rating, and not continuous. One would need to look at the spec sheet for more details.

    Well, looking at the typical inline computer etc. UPS units, this is not far off.

    But, keeping 5000W going would require some serious battery bank.

    I believe people are too focused on the high watts of inverters, forgetting the batteries one would need behind it to keep that beast going for any significant period of time

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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by SAND View Post
    Keep in mind that the 5000W may be peak rating, and not continuous. One would need to look at the spec sheet for more details.

    Well, looking at the typical inline computer etc. UPS units, this is not far off.

    But, keeping 5000W going would require some serious battery bank.

    I believe people are too focused on the high watts of inverters, forgetting the batteries one would need behind it to keep that beast going for any significant period of time
    From the website:
    Specifications

    Output Power: 2000W / 3000W / 4000W / 5000W
    Surge Power: Output Power x 2 (Double the output power rating)
    Input Voltage 12V or 24V
    Output Voltage 220- 240V AC
    Efficiency 90%
    Working Temperature 0 to 40 Degrees Celsius


    That would imply a surge output of 10 000 watt - probably kill the batteries
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    Default Re: Cheapest load-shedding battery solution

    ... as I see it ...

    ... inverter will be only say 80% efficient AND only plan to rely on 80% of its rating :
    eg for 1000w inverter assume it will only be used to deliver 800w and furthermore will only be 80% efficient ie continuous net yield 640w ...

    Fully charged Battery bank needs be matched to deliver sufficient power to inverter for at least 4 night hours , being typical load shed duration... and ideally , dont want to discharge that battery bank more than about 20% before recharging so that cycle life of batteries is near maximum.

    ie plan for integrated , matched system.

    expensive esp batteries ...

    (only plan on basis of drawing 80% of inverters advertised rating (and still having to allow for efficiency loss !) for similar reason you wouldnt drive car continuously foot-flat ...)
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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by xsel7 View Post
    Ok, I am now finally getting gatvol re this load-shedding....

    Too little to run a few laptops, a few extra screens, and the entertainment for several hours.

    Your thoughts?
    What are you needing to keep running?
    (Please don't include a 'plug point' in your list!)

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    Default Re: Cheapest load-shedding battery solution

    Can one DIY this at less than R13 000?



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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by xsel7 View Post
    Ok, I am now finally getting gatvol re this load-shedding....

    My budget is seriously strained, but this needs to be resolved.

    I found this inverter: https://doodah.co.za/inverters/33809...er_ouput-5000w

    With 2 of those Ecco 120ah deep cycle batteries, it should be enough to keep a few essentials on, right?

    I spent a long time looking, and this is the only inverter I saw that has an AC input.

    This solution appears to offer nearly double the Watts that these of the shelf solutions from Ellies, and a Mecer one I saw as well(battery box on wheels with inverter on top). They are only about 1200 to 1440 watts.
    Too little to run a few laptops, a few extra screens, and the entertainment for several hours.

    Your thoughts?
    Why don't you look at the ecco inverter, think there's a supplier in Cape Town, I've got a 3500 watt ecco inverter charger ups solar ready for the past 11 months, no issues whatsoever

  17. #17
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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by Paul Dold View Post
    Can one DIY this at less than R13 000?
    This?

    https://www.geewiz.co.za/long-run-up...kit-1440w.html
    I use this one, but bought the inverter/charger separately (no box underneath it) and used my own two Deep Cycle batteries. I think the Inverter/charger was about R2k 18 months ago. It works for us. It has a 10 amp and a 20 amp charging option (switch) and we have put it on a timeswitch, so we turn it off for 1 hour a day. I do not think it is an intelligent charger.

    It runs for the 4 or a bit more hours and then it has drained less than 25%. Runs 8 x 5w Leds in and around the house, plus the HiFi, TV, Router and 4 lights are permanently plugged into it, so when the timer turns it off every night, those devices run on it for one hour daily.

    There is also this:
    https://www.geewiz.co.za/long-run-up...-kit-720w.html
    Last edited by mvcoller; 2020/02/09 at 12:48 PM.
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  18. #18
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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by toppie4x4 View Post
    Why don't you look at the ecco inverter, think there's a supplier in Cape Town, I've got a 3500 watt ecco inverter charger ups solar ready for the past 11 months, no issues whatsoever
    Yes, I am looking into that. Where did you get yours as I have not yet found a cpt supplier.

  19. #19
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    Default Re: Cheapest load-shedding battery solution

    Quote Originally Posted by Prof View Post
    Argument only holds true if you pull the full 5000W all the time continuously
    Yes, but my point is that one should not pull as high as 5000W on a small battery bank. Lead acid lasts longer if you:
    - Charge over 8-10hours
    - Do a full charge when starting to charge
    - Discharge in 8-10hrs (or longer) - 170W on that bank

    5000W on 12V is almost 400A! You will need very thick wires and big fuses and a bank of a MUCH larger size.

    Increase the battery bank size, go with lithium or go with a smaller inverter. Your batteries will not last.
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  20. #20
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    Default Re: Cheapest load-shedding battery solution

    Ok Guys, thanks for the input.
    I am now looking at a hybrid 3kva.
    I can probably get my hands on a RCT-axpert 3kva.
    Next up. A battery box like the ellies one.

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