1 or 2 new batteries? |
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Danielw1
Senior Member Joined: 01 Apr 2017 Location: Oregon Online Status: Offline Posts: 115 |
Topic: 1 or 2 new batteries? Posted: 29 May 2017 at 10:47pm |
Going camping on Thursday for the first time in the rpod. Wondering how much power the furnace will use, lows are in the 35 range at night. Will only use heat at night. Should I bring the buddy heater to conserve or will I have enough juice?. Hope to be gone for 3 days. Going to be using fridge on propane and very little water. I have 2 brand new 6v duracells.
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
Posted: 29 May 2017 at 6:39pm |
That's what I am hoping.
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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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GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2630 |
Posted: 29 May 2017 at 1:26pm |
As I think I've said elsewhere, we have many communications sites we maintain on solar power. As a result we are using a lot of SLA/AGM batteries. You can get a little more peak energy out of wet cell than AGM, but the AGM can be discharged to as low as 40% capacity, where as a wet cell can sustain damage when taken below 50%. So for the reduced maintenance, and longer run time, we pretty much only use AGM. We used sealed versions, so they don't outgas, and are in general more robust than the wet cells. However, with the Tesla giga factory coming online, and others like it around the world, I expect the cost of lithium-ion batteries to be coming down a lot. They are "almost" cost competitive with lead acid now. I think in another couple years, they will equal lead acid in cost, and they already beat them in performance. Newer technologies will increase the performance gap; more storage per unit volume/weight as well as faster charge times.
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
Posted: 29 May 2017 at 1:02pm |
If it works for you, great. I chose to go with the dual 6V batteries. When it comes time to replace them, I will go with something that will give me the most power for the price I am willing to pay. Whether that will be 6V or 12V remains to be seen.
Hopefully, by then a better technology may become affordable enough to consider. I would really like to go with a battery or batteries that store more energy at a significant reduction in weight. However, they are not yet available at a price I can afford. |
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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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GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2630 |
Posted: 28 May 2017 at 10:32pm |
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
Posted: 28 May 2017 at 10:19pm |
I see it as a wash. If a cell goes bad in one of my 6V batteries which are connected in series, it would be the same as if a cell went bad in a single 12V battery. The upside of the dual-6V batteries is that I gain significant capacity at a reasonable price. While a pair of 12V batteries would work, I don't see many true deep-cycle 12V batteries. At best, they are hybrid marine batteries.
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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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GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2630 |
Posted: 28 May 2017 at 3:42pm |
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
Posted: 28 May 2017 at 1:59pm |
True deep cycle batteries give the ampere hours. Our Duracell SLIGC110 GC2 6V batteries are 215 Ah at the 20 hour rate.
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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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GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2630 |
Posted: 28 May 2017 at 11:06am |
To put it in layman's terms, a 120 watt load on a 120VAC circuit is only 1 amp (a pretty small current draw). That same load on your battery is going to be 10 amps. That is a big draw on your battery, and you have to take that into consideration. I wish they sized batteries according to the watt-hours of storage. Instead they give you CCA (Cold Cranking Amps), and/or AH (Amp-Hours). The amp-hours is the more useful, but it would be even better if it was just pure watt-hours. The watt-hours would eliminate having to take whatever the voltage is.
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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Danielw1
Senior Member Joined: 01 Apr 2017 Location: Oregon Online Status: Offline Posts: 115 |
Posted: 16 Apr 2017 at 6:28pm |
Good to know! Thanks
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