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IV-10
amperes for one hour, you will have drawn a total of 10 ampere-hours
from your battery(s).
Let's look at a practical example of how you can use your electrical audit
and ammeter to know when recharge is going to be required. Let us say
that you are sailing overnight and that you have just turned on your
running lights and compass lights. The battery(s) are fully charged. You
note that the ammeter shows 5 ampere draw. It is 2000 hours. At 0600 the
next morning the sun rises and you shut off the running lights. The draw is
now zero--nothing else is running. You have drawn the amazing total of
50 ampere-hours (5 amps x 10 hours). If you had a single battery with 60
ampere-hours usable capacity could you now start your engine? Yes, you
could. A starter requires about 60 amperes to turn over a diesel engine. If
it takes one minute to turn over the engine before start (an unusual
situation), you can see that starting would, in effect, require one ampere-
hour.
You must remember that much more than your running lights are apt to
come on during the night. The electric bilge pump may come on; the
pressure water pump may come on; you may be using an electric
autopilot; you may require deck flood lights; somebody may play the
stereo. All of these devices may require so much power that you end up
with insufficient charge to turn your engine over.
Summary of Contents for 37
Page 1: ...Chapter I OPERATIONS AND MAINTENANCE MANUAL Chapter 1...
Page 7: ...I 6...
Page 8: ...I 7...
Page 9: ...I 10...
Page 10: ...I 11 BARIENT WINCH 22 WINCH ASSEMBLY...
Page 14: ...II 3 Polars for Tayana37 Cutter...
Page 18: ...II 7...
Page 45: ...IV 8...
Page 54: ...IV 17...
Page 69: ...V 13...
Page 76: ...V 20...
Page 80: ...V 24 moisture eliminating product...
Page 81: ...V 25...