Hope this is posted in the correct spot. I am a teacher and my class is participating in our 4th solar boat regatta here in Northern California. The contest has really evolved over the years, and this year they have really made some changes. One of the three races is run under battery power (in case the event has rain or cloudy weather.) This year, here are the specs for the battery:
The battery bank must consist of a sealed,
marine quality battery/batteries having
a total rating of not more than 180 Watt-
hours. Example: 15 amp-hours @ 12 volts.
If a charge controller is used in the solar
charging system of the boat, a visible
means to disconnect the battery from the
charging system must be installed. No shore
charging of batteries will be permitted using
a generator or any other means. Once the
battery bank has been inspected, approved,
and tagged, it may not be exchanged.
Participants must bring a copy of the
battery specifications in a clear, plastic
We need a 24v system, so 2 x 12v batteries at 7.5 aH max. (Or a 24v battery if you have a source, even a source that can build them.)
I would love to hear suggestions for lithium batteries that would fit this spec. Since we run a 200w motor (the used solar panels we have can only give us that much useable power and you must use the same motor in all three races), I was hoping to get away from SLA in order to shed some pounds. Here is the link to the entire 38 page race packet if you are interested:
https://www.smud.org/en/about-smud/envi ... Packet.pdf
A link to the race page:
https://www.smud.org/en/about-smud/env ... egatta.htm
Our boat last year:
http://teacherweb.com/CA/Evergreen6thGr ... /apt4.aspx
Thanks again for any suggestions!