After reading all of this, for my use, the less expensive lead acid
batteries seems the right choice and then use the savings for a good
solar install (this is really an after the fact justification because I
already bought the solar system!). We are weekenders with a week out 2
or 3 times per season. I was wondering what I would do for batteries
next time around and this discussion has really helped. My boat has
room for 3-group 27 house batteries under the V-Berth and a starting
battery under the cockpit. Currently the house batteries are "dual
purpose" (whatever that means) 85ah each. I'll go to some good deep
cycle batteries next. I think I can get some more amp hours and keep
them topped up with a 400watt solar array. My goal is to be able to run
the refrigerator and autopilot I'm about to install. I'll keep watching
this thread but, if anyone has some advice on a good lead acid deep
cycle choice, I'd love to hear it!
Danny
On 10/17/2018 9:13 AM, Francois Rivard via CnC-List wrote:
Just a quick note as a lifetime R/C planes guy with a fair amount of
experience experimenting with battery chemistry..
The "Lithium" batteries referred to by Joel are NOT the same as the
exploding laptop / phone batteries you hear about on the news.
The batteries in Laptops / Phones / Electric cars are Lithium Ion
Polymer (LiPo) batteries. They offer the best energy density or
"Power to weight" of the regular commercially available batteries but
they are more sensitive to mishandling hence the bad rep.
https://en.wikipedia.org/wiki/Lithium_polymer_battery
The "litium" batteries referred to by Joel are *lithium iron phosphate
(LiFePO**4) *commonly known as LiFe batteries. They are a
"reasonable Compromise" batteries that much higher energy density than
Lead Acid / not as much as LiPo but are also much more stable than
LiPo / less likely to misbehave if handled incorrectly..
https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery
Quote from an electrical engineering forum:
The main advantage of Life is safety. Lipos begin self heating at
temperatures as low as 60°c, and once the interior starts to burn the
whole battery rapidly 'explodes' into flames, setting fire to anything
nearby. LiFe is more resistant to thermal runaway, 'cooks off' at
higher temperature, and burns much less energetically.
In other words: LiFe's are pretty safe and being much lighter than
Lead acid, make a nice improvement over older chemistry. It's really
more a question of price / how bad you want to save the weight.
-Francois
1990 34+ "Take Five"
Lake Lanier, GA
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