James, Here is the only information I found so far on the Morningstar website tech support notes section.
" With some system modifications, lithium-ion batteries can be used with Morningstar MPPT controllers (TriStar and SunSaver). The battery bank must have a built-in or connected battery management system to monitor cell voltages. Further, the battery management system must NOT have an automatic full charge disconnect feature that breaks the controller connection to the battery. The controller will not operate without a power source. Finally, the controller needs to be programmed / set to disable the float and equalization stages so that current to maintain absorption voltage will be available at all times."
Well I am not sure what the "battery management system" is their talking about ? So I better do some more research :-)" With some system modifications, lithium-ion batteries can be used with Morningstar MPPT controllers (TriStar and SunSaver). The battery bank must have a built-in or connected battery management system to monitor cell voltages. Further, the battery management system must NOT have an automatic full charge disconnect feature that breaks the controller connection to the battery. The controller will not operate without a power source. Finally, the controller needs to be programmed / set to disable the float and equalization stages so that current to maintain absorption voltage will be available at all times."
On Fri, Mar 21, 2014 at 6:46 PM, James Sizemore <james@deny.org> wrote:
For 12 volt batteries set your MPPT charger to bulk at 14.2 volts and float at 13.3 volts.Or check Morningstar's web site they may already have a LiFePo charging profile. My MPPT solar charger from Victron did.Serenity Solar Canoe: https://sites.google.com/site/serenitysolarcanoe/TommyPlease reply and confirm if I am on the right track or am I missing something ?If this is the case then I sure could lighten my battery weight or keep the weight the same and double my Ah's perhaps from 218 ah from my two batteries now to the 400ah range.I have 2 deep cycle 109ah batteries in my solar canoe "Serenity" right now and if I am understanding you I just replace my batteries with a 4 pack series or two 4 packs in parallel like the batteries in the boat now are.Nothing else needed ? I have a pretty high quality Morningstar MPPT controller and if I hearing you right then I just keep that and the solar panels as they are and wired the same ?
On Wed, Mar 19, 2014 at 9:50 AM, Robert Lemke <robert-lemke@att.net> wrote:
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
TommyHere is my canoe. It has (2) 109ah walmart deep cycles in it now.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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