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StephenH ![]() podders Helping podders - pHp ![]() ![]() Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6297 |
![]() 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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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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Keith-N-Dar ![]() podders Helping podders - pHp ![]() ![]() Joined: 03 Apr 2011 Location: Mayville, WI Online Status: Offline Posts: 1447 |
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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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Keith-N-Dar
Boris & Betty (Boston Terriers) 2011 R-Pod 177 2010 Ford F-150 |
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GlueGuy ![]() Senior Member ![]() ![]() Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2631 |
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+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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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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furpod ![]() Moderator Group - pHp ![]() ![]() Joined: 25 Jul 2011 Location: Central KY Online Status: Offline Posts: 6128 |
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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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CharlieM ![]() Senior Member ![]() ![]() Joined: 23 Nov 2012 Location: N. Colorado Online Status: Offline Posts: 1797 |
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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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Charlie
Northern Colorado OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD |
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Blender Bob ![]() Groupie ![]() ![]() Joined: 11 Mar 2018 Location: Colorado Online Status: Offline Posts: 48 |
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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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Bob
2015 Chevy Colorado Z71 2018 178 R-pod Hood River Edition |
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Tars Tarkas ![]() Senior Member ![]() ![]() Joined: 14 Jan 2013 Location: Near Nashville Online Status: Offline Posts: 1446 |
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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. TT |
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2010 176
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lostagain ![]() Senior Member ![]() ![]() Joined: 06 Sep 2016 Location: Quaker Hill, CT Online Status: Offline Posts: 2588 |
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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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Never leave footprints behind.
Fred & Maria Kearney Sonoma 167RB Our Pod 172 2019 Ford F-150 4x4 2.7 EcoBoost |
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texman ![]() Senior Member ![]() ![]() Joined: 24 Jul 2014 Location: TeXas Online Status: Offline Posts: 446 |
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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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CharlieM ![]() Senior Member ![]() ![]() Joined: 23 Nov 2012 Location: N. Colorado Online Status: Offline Posts: 1797 |
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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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Charlie
Northern Colorado OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD |
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