Tommy,
Serenity Two would be a good candidate for LiFePO4 cells. I got my cells from Balqon, (8) 100 a-hr 3.2 volt cells, 4 in series to make (2) 12 volt packs. For me without solar, one pack is the outbound pack, the other is the return pack. It is compatible with solar, and since the cell resistance doesn't allow a artificial surface voltage, will allow your solar panels full output without tapering so you will get more energy into these batteries in a shorter time vs lead when charging.
Balqon has been a bit flaky on delivery times for cells that aren't the big 700 and 1000 a-hr cells, so check these folks out.
Bob
From: Tommy Boy <tommy033107@gmail.com>
To: electricboats@yahoogroups.com
Sent: Saturday, March 15, 2014 12:40 PM
Subject: Re: [Electric Boats] Electric Kayak
I built a solar canoe and would love to upgrade to that type of battery. 18 miles to 80 miles wow ! What brand and model is your battery ? where did you buy it at ? Is it compatible with solar panels and wired up the same as lead acid ? Does it charge at the same rate as a lead acid ?
Sorry so many questions but you really grabbed my interest with your post. https://sites.google.com/site/serenitysolarcanoe/
On Thu, Mar 13, 2014 at 12:48 AM, <ewdysar@yahoo.com> wrote:
Hi Bob,Doesn't 200Ah weigh about 250 pounds? Wait, maybe not, you didn't mention voltage. 200Ah@12V should weigh about 65 pounds, 24V close to 130 pounds, 36V about 190 pounds, and so on....I'm guessing that your original FLA batteries were rated with lower capacity. Same weight? Lithium weighs about 40% as much as FLA or AGM for the same rated capacity and voltage. That generally leads to only 3 times the range for the same weight battery pack at the same speed (2.5 times on capacity alone, the rest from lithium's lower Peukert's coefficient). So a 5 times range increase sounds like 60% more battery weight and about twice the battery size (volume).
80 mile range? At what speed? We all know that speed has a huge influence on overall range. Should we assume that 80 miles means about 70 nautical miles? We are discussing boats after all....All of this is an educated guess, but there's not much info to go on. Can you let us know if any of these guesses are correct? Providing more specific info is a bigger help to those who would follow in your footsteps.Fair winds,EricMarina del Rey, CA
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