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Thread: Texas deep freeze
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02-18-2021, 12:23 PM #11
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I read an rv tank heater draws between 4 and 11 amps. The RV has 3 of them so thats another 15-30 amps per hour. I guess that is why the battery’s were dead.
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02-18-2021, 02:55 PM #12
I agree with you about most people’s use of batteries that are supplied by dealers. In fact I think most really don’t understand how their electrical components relate to their power until of course it doesn’t work. And again I agree they keep killing them by over discharge.
I think people learn on here by being exposed to others ways of overcoming , new projects for improvement, and new technologies. That’s why I mentioned the Firefly AGM. It’s a lead based AGM with a lot of properties that people buy lithium’s for. Some advantages even in safety and cost.
In the OP case it may not have deadened like his wet cell.
As far as depleting to zero, it’s not good for any battery. I’ve know a few Fireflies take down past 20% and they recovered.
Unlike other AGM they can be left in a depleted state without penalty where that is death for most lead based batteries.
My post was to give others a look at another option other than wet, standard AGM , and lithium options. These batteries are used extensively by world cruisers especially and are quite common on the west coast of the US as options. Not sure why they have not caught on.
I have no affiliation with Oasis....just a very satisfied customer.Donna and Dave
Annapolis, Maryland
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350 W Newapower Solar: 3000 Victron Inverter/ Charger: Firefly Oasis carbon foam AGM
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02-18-2021, 03:22 PM #13
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That's a little over-simplified. The furnace doesn't usually run 100% of the time. If it did, your calculations would be correct. The furnace cycles, using its 12 amps intermittently. The batteries function as an energy reservoir that can be at, slightly above, or below "pool level" (using the reservoir metaphor). The charger needs to provide enough energy to bring the batteries back up to full charge level after the furnace fan motor has drawn them down. Unless the furnace is running 100% of the time, this will not require 12 amps of charge current.
RobU.S. Army Retired
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02-18-2021, 03:55 PM #14
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Bill & Marsha
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Not All Who Wander Are Lost
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02-18-2021, 07:13 PM #15
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02-18-2021, 10:07 PM #16
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That said, I took a closer look tonight and these Firefly batts look pretty good...I wasn't aware of them and learned something. Similar performance to LiFePO4 (including complete discharge). Why haven't they taken off in the RV world? My guess would be their weight...they are heavy and lighter is better for tow vehicle payload limitations...probably not so much of a concern on a bobbing boat...they may help you plane out 😎 Forum discussions are cool!
GoodOz
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02-19-2021, 05:19 AM #17
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02-19-2021, 05:46 AM #18
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02-19-2021, 07:06 PM #19
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I'm in the Rio Grande Valley and just survived the freeze here in Texas. I must have one hell of a good battery. It got down to 26 Sat. night with a wind chill of 10. My battery lasted all night no problem. I charged it back to full charge off a generator and a 4 amp Battery Tender and used it all night the next night in the same temperature minus the wind. No problem.
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