Load shedding solution assistance

marine1 said:
Noob question what woukd the benefit be for using 24v over 12v
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DC cables are not as thick, less DC loss over a distance, not that it makes much difference in a UPS but it is also easier to convert 24volts to 220volts (factor of 5) as oppose to 12v to 220v (factor of 10)
 
phillyza said:
I am looking for exactly the same solution. Only want to power my CPE and the router. The CPE has got a 12V, 1A output and the router a 9V, 600mA output.
Will I be able to just get one of these 12V batteries for this purpose?
I also probably need a voltage regulator for the 9V router?
What else would I need if I want to DIY? A charger to charge the battery and the wires and the crocodile clips, and the little round connections that plugs into the CPE/router?
a0b6a2aaa368bc60ef154d2a401cc1aa.jpg
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for the 12v part you just make up a cable and stick it onto a spare 12v battery that you have lying around that is fully charged.
for the 9v part you need to convert that 12v battery to 9 volt with a minimum of 600 milliamps so somehting like this will work
https://www.powerstream.com/daa-1209.htm
 
RedViking said:
This one has a 10A & 20A charger https://www.geewiz.co.za/long-run-u...ah-battery-8-hour-battery-life-kit-1440w.html

Also you DO NOT want to run it to completely flat. The suggestion for batteries (deep cycle anyways) is not more than 50%.
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This looks like something that I would like to buy soon.

So, essentially 8-hour model needs to be run for just 4 hours and no more? And in that case, do you get indication (from the model you referred here) that 50% battery life is reached? @GeeWiz ?
 
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surface said:
This looks like something that I would like to buy soon.

So, essentially 8-hour model needs to be run for just 4 hours and no more? And in that case, do you get indication (from the model you referred here) that 50% battery life is reached? @GeeWiz ?
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It shows you when it has resched 100%,75%, 50%, 25% and apparently it will give a warning and/or switch off if the batteries are critically low. Would be interesting to know what is considered 'critical', I assume that will be 25%.
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groen_mamba said:
Guys quick question here, and I have tried to find the answer but to no avail, what size UPS do I need in order to run my fibre router and that other box that requires power( forget the name) for say 3 hours. In CT the loadshedding lasts for 2,5 hours per slot, so 3 hours is fine for me.
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Router uses approx 10W
Fibre ONT uses approx 10W

TOTAL = 20W per hour

I would suggest a 1000VA UPS just to be safe, something like this:
https://www.geewiz.co.za/ups/35087-kstar-1000va-line-interactive-ups-wusb-.html
 
surface said:
This looks like something that I would like to buy soon.

So, essentially 8-hour model needs to be run for just 4 hours and no more? And in that case, do you get indication (from the model you referred here) that 50% battery life is reached? @GeeWiz ?
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A 12V battery gives you 100Ah at 20hr discharge. At 4 hours discharge we get around 70Ah.
Taking into account that the lowest you should let the battery discharge is to 30% SOC (whereby the inverter shuts off), we take 70Ah * 0.7 = 49Ah that you can get out of the battery.
49Ah * 12V = 588Wh (we wound off to 600Wh to make calculations easier).

So 150W will last you up to 4 hours :-) on our 720W model
2 batteries on a 1440W model will last up to 8 hours (even longer technically as your discharge time is now 8 vs 4 hours)
 
Had a Mercer inverter charger. Glad to be rid of it. Not good quality and stuffs up your battery life much sooner than a proper more expensive solution.
 
GeeWiz said:
A 12V battery gives you 100Ah at 20hr discharge. At 4 hours discharge we get around 70Ah.
Taking into account that the lowest you should let the battery discharge is to 30% SOC (whereby the inverter shuts off), we take 70Ah * 0.7 = 49Ah that you can get out of the battery.
49Ah * 12V = 588Wh (we wound off to 600Wh to make calculations easier).

So 150W will last you up to 4 hours :) on our 720W model
2 batteries on a 1440W model will last up to 8 hours (even longer technically as your discharge time is now 8 vs 4 hours)
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Thank you very much. Do you guys also provide a solution where you can hook up inverter to DB board etc? I am thinking of 1440W model and buying 2 additional batteries to last close to 10 hours.
 
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Chuckmyster said:
OP: That is a 24v system so 2 batteries in parallel in series or 4 batteries in total, cant have an uneven number in this array.
4 and a half hr load shedding is long, remember the system is going to run hot for a long time recharging your array, so the more batteries you add the longer the charger is going to run to get your batteries up to full capacity.
This is risky
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*series
 
RedViking said:
Well join the conversation then
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Nah, I'm on my phone at the moment. Will join in the morning.

I've got everything that I bought from GeeWiz still standing in the garage. Still trying to scrape together some cash to get someone to install the schit
 
surface said:
Thank you very much. Do you guys also provide a solution where you can hook up inverter to DB board etc? I am thinking of 1440W model and buing 2 additional batteries to last close to 10 hours.
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Yep, I would suggest a pure sine wave for the DB board, but modified can be done (just be careful which plugs you wire them into and be careful it cannot be overloaded). You can connect an additional 2 batteries in parallel to the 1st two, will work like a charm. Pop us an email and I can get a quote sent (and change the cabinet to 4 batteries).
 
Only a pleasure! For a microwave, you will need a pure sine wave inverter, so the plug and play units unfortunately will not work correctly.
You can see a demo here - listen to the noise the microwave makes - if you run it long enough it can fry the insides :
 
GeeWiz said:
Only a pleasure! For a microwave, you will need a pure sine wave inverter, so the plug and play units unfortunately will not work correctly.
You can see a demo here - listen to the noise the microwave makes - if you run it long enough it can fry the insides :
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Would that be one of these type of units?

https://www.geewiz.co.za/rct-invert...0va-2400w-pure-sine-wave-inverter-mks-3k.html

Looking at the UPS option, to keep my WiFI router and CPE unit going, do you have a UPS where I will be able to add my Media Player (6W) and LED TV (107W) going as well?

My thinking is to get a cheaper options for those electronics and the the more expensive option to keep other essentials going, ie Microwave (if possible) and some lights (running off a power cord)
 
Hi, does anyone have advice if one were to power the alarm system, an LCD TV, Wifi router and fiber CPE during 4-5hr load-shedding? We have rechargeable lamps and gas, so I'm tackling the security and entertainment.

It would be great if this could later be expanded to charge via solar panels.
 
RedViking said:
What should one expect in terms of battery life if it is only used for backup? About 5 years?
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Depends on the battery’s specifications and how deep you’re draining them. If you constantly drain them past 80% they won’t have nearly as many cycles as if you were only draining to 25-50%. A generic AGM deep cycle battery if drained constantly between 100% and 75% would last somewhere between 250-500 cycles before you’d have issues.
 
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