Nationals at Richmond Yacht ClubMay 20 - 22
Result
PosBoatTotalRace 1Race 2Race 3Race 4Race 5Race 6Race 7
1Peaches184(4)3(7)4(11)4(15)1(16)1(17)2 (19)
2Motorcycle Irene181(1)2(3)3(6)3(9)5(14)3(17)3 (20)
3Under the Radar237(7)1(8)1(9)1(10)3(13)5(18)5 (23)
4Hot Sheet242(2)4(6)3(9)4(13)2(15)2(17)7 (24)
5Magic Bus303(3)5(8)5(13)6(19)6(25)4(29)1 (30)
6Bombora516(6)7(13)8(21)5(26)4(30)15(45)6 (51)
7Fired Up!5412(12)8(20)6(26)8(34)9(43)7(50)4 (54)
8Freaks on a Leash579(9)9(18)7(25)7(32)7(39)9(48)9 (57)
9Abigail Morgan628(8)11(19)10(29)9(38)10(48)6(54)8 (62)
10Dianne7510(10)10(20)9(29)DNS(45)12(57)8(65)10 (75)
11Artemis765(5)6(11)12(23)DNS(39)11(50)10(60)DNF (76)
12Public Enemy8012(12)12(24)11(35)10(45)8(53)14(67)11 (78)
13Tequila Mockingbird8811(11)14(25)14(39)11(50)14(64)11(75)13 (88)
14Current Affair8814(14)12(26)13(39)12(51)13(64)12(76)12 (88)
15Phoenix10715(15)RET(31)RET(47)DNS(63)15(78)13(91)DNF(107)
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Author: dan mcgraw ([email protected]) contact the author
Subject: Looking for battery/electrical ideas
Info: (18914 views) Posted: Wednesday 3-6-13 07:21:45 AM
Thanks for the input everyone, I thought I'd share my final decisions.

For bouy racing, all I need is ability charge my TackTick stuff, and emergency lighting. My LED nav lights draw about 250 mah total, so I'm just going to do 8 x AA batteries in a case in tupperware and replace them a couple times a year. This will plug in where the "offshore/cruising" battery does. The batteries will (eventually) be mounted in the bilge if I can make it work.

For offshore work, I've calculated that given a 24 hour period in "race mode", I will consume ~32.5 amps if I'm monitoring VHF continually, and 17.8 amps if I am not. We plan to monitor VHF on handhelds when the rules allow.

Given a 20% "discharge floor" for lead acid batteries, that means I need ~21.3 amps for a 24 hour race, so I plan to buy a simple 20 amp sealed lead acid battery (scooter battery sorta thing) that weights 14 lbs.

My calculations included assumptions for use of:

VHF at idle, VHF at receive (5% of time), VHF transmitting (5 min over 24 hours), TackTick trickle, Nav lights (50% run time), Interior LEDs (8% run time), Charging a smart phone 1.5 times every 24 hours, Charging a GoPro once every 24 hours, Running a Garmin handheld GPS continually

I feel there is some margin in these numbers, the real need is probably more like 12-15 amps.

For longer races, obviously we will need a bigger battery or a way to augment.

I'd be happy to share my calculations with anyone who is interested.

-dan
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