โFeb-26-2021 02:31 PM
โMay-11-2021 08:14 AM
pianotuna wrote:
Gjac,
Thanks.
If I were younger, I would be planning on Edison Cells which last 30 years. At that point, the electrolyte is changed out--and 30 years more! They are even more expensive than Li.
โMay-10-2021 08:24 PM
โMay-10-2021 04:48 PM
โMay-10-2021 01:14 PM
FWC wrote:What I really need is a way to regenerate FW, solar would not help me stay any longer unless I could conserve water better or collect it some how. Also where I camp in the NE it is all forest. No sun.Gjac wrote:
If I understand your post correctly because of a deeper discharge of Li Down to 0 SOC and with 2 6v GC batteries only going down 50% SOC gives only 115 usable AH's. Is that what you are saying?
That, and that if you can go a week on 115Ah, then storage is not your limiting factor. If you had a very small solar system you could easily have indefinite power.
โMay-10-2021 12:51 PM
pianotuna wrote:
FWC has not allowed 20% which is unusable in the guess for Li. So if you "roll your own" allow for it--or even exceed it. Of course these numbers are limited by what the makers of the individual cells create.
One of the few things I like about battleborn is the batteries are really 120 amp-hours--but are sold as 100 amp-hours. Their battery management system 'shuts down' at 100 amp-hours of discharge.
โMay-10-2021 11:51 AM
โMay-10-2021 11:30 AM
Gjac wrote:
If I understand your post correctly because of a deeper discharge of Li Down to 0 SOC and with 2 6v GC batteries only going down 50% SOC gives only 115 usable AH's. Is that what you are saying?
โMay-10-2021 11:08 AM
FWC wrote:If I understand your post correctly because of a deeper discharge of Li Down to 0 SOC and with 2 6v GC batteries only going down 50% SOC gives only 115 usable AH's. Is that what you are saying?Gjac wrote:FWC wrote:I guess it comes down to what your electrical requirements are VS cost per AH. I was thinking the price of these batteries would come down to make them competitive with lead acid batteries because of the big push to go to EV cars, but as some report the prices have gone up along with other camping supplies. I dry camp 95% of the time and am conservative when it comes to water and electricity. 230AH batteries last a week before they reach 50% SOC and by then I am out of water. So I guess if you full time or have much greater electrical requirement then $900 might make sense VS $200 for 26v GC batteries. One would think with more batteries being produced the cost will comedown dramatically at some time in the future.Gjac wrote:
How much cheaper would it be to build your own? Roughly what would it cost to get the equivalent of 2 6v GC batteries say about 230 ah's?
280Ah is probably the closest 'standard' LiFePO4 cell size. For that you are looking at $600 - $700 for the cells, another $60 - $120 for the BMS and maybe $100 for wiring equipment and some sort of case. I would guess $750 - $900 all up, cheaper if you are wiling to go with Alibaba and wait on freight, more expensive if you want it shipped from the US (amazon or ebay).
This would give you ~3000 cycles at 100% DOD so about 10x the usable Ah than lead acid over the life or the battery (if you plan to use it heavily or keep it a long time).
The cost of these has fallen dramatically - the cells themselves are 1/3 - 1/2 the price of what they were three years ago, and drop in batteries can be had for 1/2 the price.
The prices are very competitive with lead acid if you are thinking about the total cost of ownership, rather than just the upfront cost. For your use case a 100Ah LiFePO4 seems like it would be sufficient, which is about $300 for the DIY route or $550 for the drop in route.
โMay-10-2021 10:38 AM
โMay-10-2021 09:34 AM
Gjac wrote:FWC wrote:I guess it comes down to what your electrical requirements are VS cost per AH. I was thinking the price of these batteries would come down to make them competitive with lead acid batteries because of the big push to go to EV cars, but as some report the prices have gone up along with other camping supplies. I dry camp 95% of the time and am conservative when it comes to water and electricity. 230AH batteries last a week before they reach 50% SOC and by then I am out of water. So I guess if you full time or have much greater electrical requirement then $900 might make sense VS $200 for 26v GC batteries. One would think with more batteries being produced the cost will comedown dramatically at some time in the future.Gjac wrote:
How much cheaper would it be to build your own? Roughly what would it cost to get the equivalent of 2 6v GC batteries say about 230 ah's?
280Ah is probably the closest 'standard' LiFePO4 cell size. For that you are looking at $600 - $700 for the cells, another $60 - $120 for the BMS and maybe $100 for wiring equipment and some sort of case. I would guess $750 - $900 all up, cheaper if you are wiling to go with Alibaba and wait on freight, more expensive if you want it shipped from the US (amazon or ebay).
This would give you ~3000 cycles at 100% DOD so about 10x the usable Ah than lead acid over the life or the battery (if you plan to use it heavily or keep it a long time).
โMay-10-2021 09:26 AM
โMay-10-2021 09:00 AM
โMay-10-2021 07:08 AM
FWC wrote:I guess it comes down to what your electrical requirements are VS cost per AH. I was thinking the price of these batteries would come down to make them competitive with lead acid batteries because of the big push to go to EV cars, but as some report the prices have gone up along with other camping supplies. I dry camp 95% of the time and am conservative when it comes to water and electricity. 230AH batteries last a week before they reach 50% SOC and by then I am out of water. So I guess if you full time or have much greater electrical requirement then $900 might make sense VS $200 for 26v GC batteries. One would think with more batteries being produced the cost will comedown dramatically at some time in the future.Gjac wrote:
How much cheaper would it be to build your own? Roughly what would it cost to get the equivalent of 2 6v GC batteries say about 230 ah's?
280Ah is probably the closest 'standard' LiFePO4 cell size. For that you are looking at $600 - $700 for the cells, another $60 - $120 for the BMS and maybe $100 for wiring equipment and some sort of case. I would guess $750 - $900 all up, cheaper if you are wiling to go with Alibaba and wait on freight, more expensive if you want it shipped from the US (amazon or ebay).
This would give you ~3000 cycles at 100% DOD so about 10x the usable Ah than lead acid over the life or the battery (if you plan to use it heavily or keep it a long time).
โMay-09-2021 11:45 PM
Almot wrote:
Many camping items have disappeared and/or prices jumped up in April-May.
Solar generator is an overpriced combo of Li battery and inverter, $CAD 1,400 for 1,000 WH. I paid $CAD 800 for 1,500 WH, i.e. 3 times cheaper per KWH. With a single 1,000-1,500WH battery you don't want a big inverter, nice 300-400W PSU inverter would cost less than $CAD 300 and I already had one.
It does take 200-300W solar to keep it topped up, but for a weekend with modest loads you just discharge battery down to zero and go home. (Actually down to DOD 20% in my case, since it's 120 AH marketed as 100 AH). What I particularly like is 30 lbs weight - much better than 70 lbs FLA or AGM of the same nominal capacity (not to mention 2 times less of usable charge).