My adding inverter plans - Pls review and comment - Event Date: 29 Mar 2018 |
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furpod
Moderator Group - pHp Joined: 25 Jul 2011 Location: Central KY Online Status: Offline Posts: 6128 |
Calendar Event: My adding inverter plans - Pls review and comment Posted: 30 Mar 2018 at 3:39pm |
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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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GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2652 |
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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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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Keith-N-Dar
podders Helping podders - pHp Joined: 03 Apr 2011 Location: Mayville, WI Online Status: Offline Posts: 1447 |
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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Keith-N-Dar
Boris & Betty (Boston Terriers) 2011 R-Pod 177 2010 Ford F-150 |
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6326 |
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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furpod
Moderator Group - pHp Joined: 25 Jul 2011 Location: Central KY Online Status: Offline Posts: 6128 |
Posted: 30 Mar 2018 at 5:03pm | ||
Well.. at the proposed draw rates, there is in fact a fair danger of fire.. but yeah, in the long run, many people have a need to do things.. me included.. |
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voisj
Senior Member Joined: 19 Jul 2016 Location: San Luis Obispo Online Status: Offline Posts: 471 |
Posted: 31 Mar 2018 at 11:27am | ||
Blender Bob, Here is my experience with what you are doing. I Had a 2000w/3000w inverter that I ran in my truck , ,F250 diesel with two optima batteries, I used it on the back forty to build fences, corrals and a barn, Used it for a 13 amp worm drive saw and a 15 amp roto hammer. It would work for about an hour and then I would have to run my truck and then I could go all day. Generator would have made more sense. I sold the truck and since I had it laying around I put it in the pod, I had 100w solar and 2 12volt batteries, Have since gone to 2 6-volt). The wife wanted to run a hair dryer (rarely), and I thought occasional use of the microwave, blender, tv and such would be nice. It worked well for the small stuff but drained the two 12 volts really fast with the microwave or Hair dryer (1875w) I took it out I ended up getting a 3000w inverter generator, Which we rarely use and is really quiet. IMHO you would really need 4 6-volt golf cart batteries and more than 200w of solar, to make this work the microwave and keep it charged up for an extended stay. It's not really worth it when you could just fire up a genny for a few minutes and get 'er done. I do realize that new, or soon to be, battery/solar/equipment technology can make this feasible because there are some really cool things being done in really $$$$ all electric campervans and trailers. But i do understand the need to play with the idea!!!! rgds John |
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Olddawgsrule
Senior Member Joined: 20 Sep 2017 Location: New Hampshire Online Status: Offline Posts: 1014 |
Posted: 31 Mar 2018 at 4:47pm | ||
Lithium Ion batteries are the way of the future in my mind and will change over as soon as I find the right dealer/manufacture to buy from. Currently find Littokala as being as described and well priced. Still too expensive to go 'all the way'. Maybe during their November sale... |
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Keith-N-Dar
podders Helping podders - pHp Joined: 03 Apr 2011 Location: Mayville, WI Online Status: Offline Posts: 1447 |
Posted: 31 Mar 2018 at 6:24pm | ||
I am sure the OP knows that the wiring from the battery to the inverter needs to be ap[ropriately fused to prevent the wires from burning. If not he should forget the entire project. |
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Keith-N-Dar
Boris & Betty (Boston Terriers) 2011 R-Pod 177 2010 Ford F-150 |
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furpod
Moderator Group - pHp Joined: 25 Jul 2011 Location: Central KY Online Status: Offline Posts: 6128 |
Posted: 31 Mar 2018 at 6:56pm | ||
At those rates of discharge, the battery itself can "overheat". again, the higher the discharge rate, the higher the internal resistance of the battery itself. |
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Blender Bob
Groupie Joined: 11 Mar 2018 Location: Colorado Online Status: Offline Posts: 48 |
Posted: 31 Mar 2018 at 7:30pm | ||
Thanks Voisj for your story and suggestions. In time, I believe more battery capability solves a lot of problems. And, managing demand is equally important. On the Colorado plateau, no hair dryer needed. With desert air, you can dry off from a shower with a bandana and your hair is dry before the first beer is gone. Cheers, B.Bob
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Bob
2015 Chevy Colorado Z71 2018 178 R-pod Hood River Edition |
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