Carter thank you. Very informative. I am sure any maintenance battery will require will be less than what I had to do to pamper my atomic 4. Early this year i had to buy two types 27 deep cycle batteries and it seems i can make use of them if i add same type...? Val |
From: Carter Quillen <twowheelinguy@yahoo.com>;
To: electricboats@yahoogroups.com <electricboats@yahoogroups.com>;
Subject: Re: [Electric Boats] RE: Hello group
Sent: Mon, Oct 28, 2013 1:19:49 PM
Val, I would ad one minor correction to Eric's calcs below. If you shop them hard you can get an eight pack of T-105 for a lot less than $1500. I just bought an eight pack of T-125s for about $1300, (without cores to trade in), and could have gotten T-105s for right at $1000 without cores. The golf cart guys get very competitive with these batteries and often settle for very low margins. This difference will have a significant effect on the economic analysis. Economics will certainly be affected by the market you are in and you could wind up spending $1500 for an eight pack of T-105s depending where you buy them but you could also spend a lot more for LiIon as well and don't forget that expensive battery management system you better get to go with them to protect your signifcant investment. I'm not promoting lead acid, even though it's what I have on my boat however, if you have a tight budget, they do work, are a very robust and mature technology, and deserve serious consideration as a battery option even if they are a bit lame when you compare their performance characteristics to Lithium. LiIon is definitely the technology of choice if you want top performance and have the money to spend but lead acid gives you good value with a lot less financial risk. There are sooo many variables when making comparisons between these technologies that I submit it is impossible to definitively say which one is actually the best value. The biggest downside to FLA is outgassing and maintenance but if you're prepared to deal with these two items properly, I think it can be argued they still deliver a very competative value against any other technology availabe today. Carter From: "ewdysar@yahoo.com" <ewdysar@yahoo.com> To: electricboats@yahoogroups.com Sent: Monday, October 28, 2013 12:37 AM Subject: [Electric Boats] RE: Hello group Hi Val, There are numerous posts in this group with information that should help you. Here's some info that has been posted a few times comparing different battery types: ------------------------------------------------------------ Here is a re-run of a post that I made on Feb 21, 2013 that compares the three major options in batteries. You'll notice that I tend to use watts instead of amps or amp hours. Since even this thread has already included three different system voltages, using amps means that you've got to do math in your head to make any meaningful comparison. The prices still seem to be close enough, the lithium prices include passive BMS modules like the ones in my battery pack (less than $300 for 16 independent modules) Here it is again: With all the recent talk about FLA vs AGM vs LiFePO4, I think that this post (#22145 from Sep 6, 2012), provides a fairly good comparison of battery banks that can deliver the same amount of work. This is as close as I've been able to get to an "apples to apples" comparison. You might want to look at the pics in the group folder "Eric's Serenity". http://groups.yahoo.com/group/electricboats/photos/album/1967401930/pic/list The last pic is half of my 160Ah 48V traction bank. Lithium is not only lighter, it is considerably smaller than either FLA or AGM. Weight and size were high priority when I designed my system. Fair winds, Eric Marina del Rey, CA --- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote: ---In electricboats@yahoogroups.com, <vechnyak@...> wrote: My boat is an old 1976 Catalina 30 (tall) and this past weekend we just pulled out the Atomic 4 engine. Over the winter I am planning to work on re-powering it with an electric motor. The boat is used for day sailing in the bay and short trips along the NY/NJ shore. Information is available online about motors but battery info seems vague at least to me since I know next to nothing about battery types and their advantages. Does anyone know of any formula that would allow to calculate all the variables to achieve say 2 hours of propulsion and have a reserve? |
__._,_.___
Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (42) |
.
__,_._,___
No comments:
Post a Comment