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.- The 'Rules' of /r/ sailing are here.- /r/ Sailing's Favorite Video Channels.“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”.― Kenneth Grahame, The Wind in the Willows. More waterways to enjoy.- 'Do you have the dream to sell it all and move aboard a sailboat to cruise the world?' .- 'The Sea is Us, and to defile the Sea is to defile ourselves.' .- 'Need crew? Want to crew?' .- 'Discuss matters nautical'.- 'Powerboating!'

.- 'Everything Boat Building'.- 'About life in the sea.' .- 'Helm's hard a'lee!' .- 'Anything kayak related'.- 'Everything Surfing'.- 'Everything Scuba'.- 'return this planet to a more pristine state of healthy, livable deliciousness by building and piloting Solar Power Electric Vehicles'.- 'Around the world sailboat race, held every three years'.- 'Books about Sailing'.- 'fans of Hydroplanes'. 48 foot Tayana here, on a circumnavigation with only an autopilot. Raymarine hydraulic main unit with a wheel drive emergency backup.

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From an energy standpoint the main unit is power hungry. With 400 watts of solar, on a sunny day, the solar barely keeps up with everything when underway (during daylight hours). At night we are running the generator periodically to keep the batteries up. It's not only the autopilot mind you, but refrigeration, nav lights, nav electronics, and sometimes radar. Our battery bank is 800 amp hours, but we like to maintain a charge above 70% (that's a whole other discussion on battery technology and preferences).The unit is a 1997 vintage, and has held up reasonably well. Electronics failed in Tonga 2 years ago (replaced), and the pin between the hydraulic ram and the quadrant sheared off while travelling between New Zealand and Fiji last year.In summary, yes you can manage long passages with an autopilot only from an energy standpoint.

Autopilots will break, so have a backup plan ready. Hand steering a long passage with just two people on board is not a good backup plan!. We charged twice per day with the engine, and found that we could get by with the autopilot driving 24/7, but we also had electronics, instruments, computer, watermaker, and keel running off that bank.Draw will be determined mostly by conditions, we had upwind days where we'd draw almost nothing, and downwind/reaching days where we had to hand steer because it was so hard on the batteries and we wanted to conserve fuel.We had two independent systems, NKE Gyro and B&G4000, both driving Raymarine rams. We had various issues between the two of them, and didn't run the autopilot for almost half of the trip because of instrument failure (bird took off the wind vane, then wand sheared off at it's base).With solar and hydro, many Class40s have only had to charge (with hydros down) for a few hours per day to keep up with their pilots. We have a big battery bank, charge about once/day off shore. 600Ah @ 24V for the house bank. We use WAY more power sailing than we do at anchor, with instruments, radar, and AP running.We lost our Autopilot 300 miles out of the Galapagos en route to French Polynesia.The system is a Furuno Navpilot 511 with an Accusteer LA-100 hydraulic ram.

I have a backup with a Whitlock Mamba drive, and an old Autohelm drive computer, but I'd likely wire the Mamba to the Furuno if I had another drive failure.The shaft inside the ram that spun the pump snapped. Eventually, we got a new pump sent to us, and we also bought spare 24V armature, so I could strip out and replace that for a spare, if needed.Rather than re-tell it here, I'm going to throw some links:Overview of the trip from SA:Some pictures of the busted pump parts:Relevant blog entries:. No, the autopilots are the same. It doesn't matter. Do you know what the box they come in says? 'Navico Simrad B&G Lowrance'Did you know the radars are exactly the same except for the sticker that goes on the dome?

(Replacement domes don't have any sticker on them)Did you know the Zeus are the NSS line with slightly different software and bezel? (Apparently you can update one with the other's software without bricking)And since you think Simrad isn't for sailing, can you tell me what this is for?Or this:Howabout these:(Hint: the first 2 links are re-branded B&G Network).

The ABYC doesnt cover the next part of the load calculation but it involves using some of the same numbers you used above to come up with a daily power consumption figure. This might be done for a couple of different scenarios, for example a boat underway would have a much different load profile that a boat at anchor.

Auratone replacement driver for mac. At anchor the electronics may be off but the lights will be on much longer, the stereo may be cranked up, the engine will usually be off, and this is typically the most energy intensive time. You can do your calculation in Amps and end up with Amp Hours as a total or you can do your calculation in Watts and end up with Watt Hours as a total, it really doesnt matter. For the purposes of this calculation we are using Amps and Amp Hours and we are using the nominal voltage of 12 volts even though the actual voltage may vary a bit.

If we take our examples above together we see a boat that consumes on average 70 Amp Hours per day and can produce more than that so the totals look good, we just have to figure out a battery size. I normally size the battery based on one full days consumption. We wont have any solar charging at night and we may not be popular running the engine at night either.

At this stage you have to realize that these calculations are all a bit vague. We don't really know how long the stereo will be on, or how long the autopilot is running but we are just doing our best shot at it and when it comes to sizing the battery and other important decisions a bit of wiggle room would be good and a lot of wiggle room would be better. What happens if you have two days without sun?

What happens if the engine breaks down? The last part of this blog post is what inspired me to write it in the first place. It is a detailed calculation done for a large catamaran that was proposing to install a lithium battery system.

The boat has a 24 volt DC system but also runs quite a bit of 12 volt DC equipment as well as having an inverter to produce 120 volts. Because of the variety of voltages it made a lot more sense to do the calculation in Watts and Watt hours and again they are using the nominal voltages of the 12 and 24 volt systems even though the actual voltage may be a bit different.

The formula to relate amps to watts is shown below.