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Aussiemike

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Posts: 29
Reply with quote  #1 

Hi Guys.

Quick simple question.
4x200A batterries at 24v
Can I connect 2 x 24v 3000w inverters to this supply?
Please excuse my ignorance.
Cheers Mike 

stmbtwle

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Reply with quote  #2 
I believe you could, depending on their size and the load, and the type of battery.

HOWEVER, 2×3000w @ 24v translates to about 250
amps. Your batteries won't last long.

Rick?

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #3 
Depends on what he means by "4x200A batterries at 24v".  The 200A sounds more like is the the capacity 200AH. Need better information on the batteries.
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Aussiemike

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Posts: 29
Reply with quote  #4 
OK
4 x 200 Amp batteries = 800A
Parallel and series to give me 24v
I had a 2400w inverter attached but it failed
Bought another and it also lasted about 4 months.
I am using the inverter to power 3 small fridges about 100 watts each.
Rather than buy a larger inverter I thought I might just buy 2 at 2400 watts each and attache 1 fridge to 1 inverter and another to the smaller 2 fridges. 
That way if 1 fails I will still have refrigeration on the other one.
Just trying to ease the load on each one.
Got 500w of solar.
Cheers Mike

stmbtwle

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Reply with quote  #5 
Whether you get 800ah depends on the type of batteries and how they are connected. Series connection by itself does NOT increase your amperage. Ex:
4, 6v x 200ah golf batteries in series will give you 24v, but still 200ah.
4, 24v x 200ah batteries in parallel will give you 24v, and 800ah.
4, 12v x 200ah batteries in series-parallel will give you 24v, 400ah.

Google is your friend, search "batteries in series and parallel".

Also, while you can connect the inverter inputs to the same source, in many cases you can't connect the OUTPUTS to the same load. The inverters are not in sync and one or both will trip out (if you're lucky). Some inverters might be designed to work together, but not all.

Re the fridges:

I have run a 7 cu ft fridge for YEARS on a single 1750w msw inverter and 6 golf batteries (at 12v) with 600w of solar.  However in the winter I didn't always have enough solar to keep the batteries up, and I had to either shut off the fridge or start a generator.  You are running 3 times the load, but a single 2400w inverter should still be more than enough as they don't all start at the same time.

I suspect your problem is you don't have enough solar to keep your batteries fully charged.  Without enough solar, your battery voltage will eventually drop.  Inverters are designed to shut off if battery voltage gets too low but continuous operation at marginal voltage may cause them to fail instead.

Do you have a battery monitor, (or at least a voltmeter) connected?
I'd run the entire system on a "kill-a-watt" (they're cheap) for 24 hrs, and get a total consumption (watt-hrs), then go from there.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #6 
"4 x 200 Amp batteries = 800A"

Depends on which amperage rating the 200 is, and how you have the battery bank configured.
I'll try this one more time: What Make and model of batteries do you have?
If I can get the spec sheet for the batteries, your questions can be answered.


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Aussiemike

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Posts: 29
Reply with quote  #7 
Thank you for your replies but I care not for the mathematics only can it be done or is it frowned upon?
Rick H Parker

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Reply with quote  #8 
Good luck figuring this out without math ... [rolleyes]
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Aussiemike

Registered:
Posts: 29
Reply with quote  #9 
Ok. I will try and make it simple.
I have 1000 batteries in series at 24v with 1 million amps.
Can I attach TWO 1000w 24v inverters to the bank?
stmbtwle

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Reply with quote  #10 
I said earlier that you could. 

You still don't have enough solar to keep your batteries charged. 

Sorry you don't like math. Without it your project is doomed to failure.

__________________
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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