For just a few batteries, I'd look at what the Radio Control guys use. I
think they have built in BMS and some are programmable.Being as you are only
going to have 4 (for 12 volt trolling), I think you could get a complete
solution cheap. I think they use differentterminology like "4S" for 4 in
series.
Larry
p.s. From experience. Get a 50amp or above trolling motor. Small ones
are "okay" in light winds, but if you've got to
buck a 20mph wind, you'd be much happier with a larger one when it's blowing.
yes it's ev blasphemy but I'd also look at a metal pair of oarlocks and
moderately decent 2-part oars. Always good to have several power sourcesif
you get stuck in a shipping channel with no wind. You don't have to do
anything fancy with a sliding seat. You can row standing up or sitting on a
cooler or anything temporary. It's a "LOT" better than a canoe paddle.
You may find it's even better than thetrolling motor as you can save the
electricity for lights and radio and gps. Expect only about 2 knots rowing.
On Thursday, October 7, 2021, 2:57:46 PM PDT, steve sawtelle via EV
<ev@lists.evdl.org> wrote:
Thanks all for the advise and ideas.
I joined the Electricboats list - excellent resource! There is also a PlugBoats
website/journal which looks good.
I borrowed our electronic load from work and will cycle a few batteries to see
what I have. Good to know it may take a few cycles to see where they are at.
I also found an excellent resource on Lithium batteries on boats:
https://nordkyndesign.com/category/marine-engineering/electrical/lithium-battery-systems/
Very thoughtful look at what it takes to make a good BMS. It's not easy. I'm
hoping to do slow charge from a small solar panel and use the batteries weekly.
It looks like it may be a bit hard to make that work really well. Well, part of
why I do things like this is to learn....
-steve
On Thursday, October 7, 2021, 11:15:12 AM EDT, paul dove via EV
<ev@lists.evdl.org> wrote:
I don't know anything about BMS's but Lithium Iron Phosphate cells can
experience capacity fade even if they have good voltage. I had some cells that
sat around for a year and a half and showed good voltage but when I cycles them
they only had 45Ah out of 100Ah they started with. I thought I ruined them but
I got back 100% of the capacity after the 5th cycle so just note you may need
to cycle more than once.
On Thursday, October 7, 2021, 8:11:11 AM CDT, Rod Hower via EV
<ev@lists.evdl.org> wrote:
There are great resources for electric powered sail boats at
electricbo...@groups.io https://groups.io/g/electricboats
On Wednesday, October 6, 2021, 07:25:44 PM EDT, steve sawtelle via EV
<ev@lists.evdl.org> wrote:
I guess this may qualify as an old-school question now.
About 12 years ago I built an electric motorcycle. I actually had it up and
running, but other things got in the way and I am abandoning the project. The
rolling chassis will get back it's ICE and I need to find a home for the 7" Jim
Husted motor and the controls. I have a new endeavor now - a small cruising
sailboat (CLC Pocketship). I'm thinking of using a trolling motor as the backup
to the sails and I hope to repurpose some of my 100 A-H Thundersky batteries
for power. My batteries have been sitting for 10 years but still are at around
3.25V. I need to cycle them to see if they are still viable of course. If they
are, what BMS is recommended for them now? I did a bit of searching but didn't
see much.
-steve
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