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Topic ClosedMy adding inverter plans - Pls review and comment - Event Date: 29 Mar 2018

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StephenH View Drop Down
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Direct Link To This Post Calendar Event: My adding inverter plans - Pls review and comment
    Posted: 30 Mar 2018 at 4:37pm
If cost is acceptable, ditch the lead-acid batteries and go with lithium iron phosphate batteries. Prices are not quite as astronomical as they used to be and LiFePo4 batteries can be drained deeper and faster than Pb-acid batteries without damaging them. That might make all the difference in whether this is a success or failure.

I am curious though to see if the OP can make it work. I have a couple of small inverters--nothing big enough to even think of running the microwave.
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Direct Link To This Post Posted: 30 Mar 2018 at 4:22pm
The OP needs empirical data on this issue.  With many people the need is to try and learn from the results.  He is not likely to ham himself with his test, so at this point the discussion is moot.  
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Direct Link To This Post Posted: 30 Mar 2018 at 3:45pm
+1 to what furpod said. There are some differences, depending on whether the battery is wet, gel, or AGM. The wet can do initially higher current (usually), and some AGM batteries can be drawn down to ~~ 40% or so. But the voltage is not linear with respect to SOC (State of Charge), and the higher you draw from them, the more it will impact the life. IOW, you could draw at 500 milliamps, and get 110% of the watt-hours, or you can draw at 120 amps and only get 75% of the watt-hours. High amps=short life.
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Direct Link To This Post Posted: 30 Mar 2018 at 3:39pm
12v is a half dead battery. 10.5v is battery that IS being damaged.
and it's not just draw down point.. The draw rate counts for a whole lot of potential damage also.
and then there is that old Peukert effect, that tells us that the FASTER you draw down a battery, the more resistance and heat is produced, both damaging the battery AND reducing it's actual, usable capacity.
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Direct Link To This Post Posted: 30 Mar 2018 at 11:42am
Originally posted by Blender Bob

1) Battery draw down needs to be managed to not kill the batteries. I will need to test / experiment where my 50% or 10.5v threshold will be.

Battery voltage must be measured unloaded and after a resting period. If you get to 10.5V under these conditions your battery is totally dead and probably damaged. Most sources indicate 50% SOC is 11.9-12.0V.
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Direct Link To This Post Posted: 30 Mar 2018 at 9:55am
Thank everyone for your posts.  I appreciate all info and perspectives. Your comments confirm some of my suspicions: 
1) Battery draw down needs to be managed to not kill the batteries. I will need to test / experiment where my 50% or 10.5v threshold will be.
2) Power draw management. The microwave is the biggest draw. Usage is not so much full meal cooking but heating leftovers / cooking a hotdog or warming a breakfast burrito. It also has 10 power settings, I can run at 50 to 75% and see what that means to 12v amps use rate.
3) I have 2awg wire in the barn to use so if I keep things below 1500w I should be good.
4) Account ~90% inverter efficiency.
5) My panels can put back 40 to 50amp hrs / day (Utah desert sun) so starting with a full charge and with a little thought, I think the solution can last for a few days, which will be mission accomplished. 

So I'm gonna try and will report back. I am compelled to try as part of my nature. Really don't want a generator, and if I can make this work, it will be so cool! Por que no?! Besides, this will keep me in the barn and out of trouble with ranch headquarters. :-)  

Thanks again everyone!
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Direct Link To This Post Posted: 29 Mar 2018 at 6:44pm
Nothing much to add -- if solar is your only means of recharging your batteries you're going to be SOL after one cloudy day.

I have and really like the Yamaha 2400iSHC.  You can spend less but you can't get much quieter.  It runs my air con and microwave, but not at the same time.  For what you'd spend on that inverter, you can have power anytime for not a whole lot more.  If you don't care about the noise you can get a generator for a good bit less than that inverter.  And you will have to spend some bucks on cables.

Listen to what folks here say.  I really don't think you'll be happy with that size inverter for very long.

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Direct Link To This Post Posted: 29 Mar 2018 at 3:11pm
If it's just margaritas you're after, then consider a 12v. blender.  Check the marine supplies.  Boaters really like their margaritas too, especially when anchored off the coast of Zihuatanejo.  Here's a sample:
https://www.roadtechmarine.com.au/12v-mini-blender/p/TCC502
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Direct Link To This Post Posted: 29 Mar 2018 at 2:26pm
premix and freeze the margs in the pod freezer and cook on the stovetop or charcoal grill.  That sounds like a lot of work for 15 minutes in the nuke box and a blender.  
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Direct Link To This Post Posted: 29 Mar 2018 at 12:49pm
I agree with all the above. Fifteen minutes of the 1500W microwave would be about 31AH at 12V which is just shy of what you could expect from your 100W solar panels in a full day of sun. For your use I would recommend a 2KW generator such as the Honda or Yamaha units. If you're set on an inverter I suggest you consider hard mounting it in the TV and connecting it with short #4 or #2 copper wires. Think jumper cables. Then you could run the engine for your 15 minutes.

The blender might be doable on a smaller inverter but you might have to use the LP appliances instead of the micro for heating. The stove will boil a lot of water and fry a lot of bacon on two 20lb tanks.
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