Nigel Calders book has a list. Joel
On Wednesday, December 18, 2013, Curtis wrote: > Wow. You guys have gone deep with the power consumption and recharging > principles. You have open my eyes to a big project moving forward. Keep in > mind my wife and I will not need much power. Bet you have heard that before > from people starting out. HAHAh. Well wet me see what it looks like. > > 1) AM/FM Radio *4 hr a week* > > 2) ST4000 AUTO helm *8 hrs a day* > > 3) Garmin echo50s (GPS) *8 hrs a day* > > 4) Bow and stern running lights *8 hrs a week* > > 5) Spreader lights *Almost never* > > 6) Mast head anchor light *(12 hours a day) LED* > > 7) Cabin lights *(8 hours a day) LED* > > 8) VHF Radio “Hand Held” *8 hrs a day* > > 9) VHF fixed mount *8 hrs a day scan mode weather alert* > > 10) Ray marine gauge “ Depth” *8 hrs a day* > > 11) Ray marine gauge “Wind” *8 hrs a day* > > 12 Ray marine gauges > > 13) IPOD for movies *2 hrs a day* > > 14) Cell phones 2 “1 droid” “1 I phone” > > > > We have no refrigerator > > We have no t/v at this time > > Toilet is a manual > > In doing my research hoping to find a Energy Budget work sheet in excel > format. This way I could plug in the cost of each of my power using pieces > and see what it comes up with. > > > On Wed, Dec 18, 2013 at 7:37 AM, Rich Knowles <r...@sailpower.ca> wrote: > > And to increase the presumptuous factor: > > The alternators that were supplied as original equipment with most small > boat engines until recently were from 35 - 55 A with internal, single > voltage output regulators. A good percentage of the engines were destined > for use in small motor vessels and these alternators were adequate for that > application. For our use, which sees greatly increased loads from, as Rick > notes, radar and refrigeration, and lengthy battery discharge periods > between charges, those alternators are bordering on inadequate, and > certainly not as efficient and appropriate as higher power units with multi > stage regulators. > > For sailing vessels, a central component of optimizing the electrical > system should be upgrading the generating capacity of the charging system. > This will involve replacing the alternator with the largest unit that can > be fitted, taking physical restrictions, drive belt capacity and depth of > pocket book into account. For most 20-35 HP engines, around 100A works > well. There are a number of external regulators available that should be > considered for installation as part of the new system. A new alternator > with a multi-step regulator will considerably reduce the engine run time > needed to replenish the batteries. Other devices such as wind generators > and solar panels are important for long range travels as well to further > reduce the dependency on the engine. > > For calculation purposes, I generally consider the usable capacity of > batteries to be 30% rather than 50% of rated capacity. This stems from the > fact that a 50% discharged battery will charge to around 80% at a fairly > linear rate which will drop significantly as the state of charge nears > 100%. Trying to achieve the last 20% can take a long time compared to the > first 30%. This will vary depending on battery type and condition, so my > 30% figure is somewhat arbitrary, but fairly realistic. > > A shore power fed battery charger from 20-40A will generally suffice to > sustain loads from refrigeration, lighting and entertainment devices > operating while the boat is alongside, and also provide enough power to > replenish the batteries. Again, a multi-step unit designed for marine use > should be chosen. There are lots of good marine chargers on the market. > > I note that non-marine AC chargers may not completely isolate the input > from the output, a potentially dangerous situation on the water, and should > be avoided. > > As Rick notes, designing an efficient, reliable electrical system is > complex. > > It's snowing again. Grrrr! > > Rich Knowles > INDIGO - LF38 > Halifax, NS > > > On Dec 17, 2013, at 20:45, "Rick Brass" <rickbr...@earthlink.net> wrote: > > Curtis; > > > > At the risk of being presumptuous, I think you have the cart before the > horse. > > > > If your intent is extended cruising – particularly offshore cruising where > you will not be using your engine for power (and to recharge the batteries) > every day – you will first need to think about the systems you have on > board and how much power they will draw. Refrigeration is a major draw. > Radar? Autopilot? What instruments? What lights? Power for entertainment > like radio or TV? Small things like a 12 v electric coffee maker or a > microwave draw a shocking amount of power out of your batteries. > > > > On > > -- Joel 301 541 8551
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