In ad­di­tion to up­grad­ing com­po­nents, the own­ers re­placed the ex­ist­ing cables with heav­ier- gauge wiring to en­sure the sys­tem can han­dle the loads.

Passage Maker - - Electronics -

con­di­tion­ing units, the wa­ter­maker, and charge the bat­ter­ies.

If we need more power, we can par­al­lel in the start al­ter­na­tor and have 9kW avail­able. This is use­ful if we have a gen­er­a­tor fail­ure, but there are times when it’s nice to be able to charge the bat­ter­ies at 300A and still be able to run the wa­ter­maker or air con­di­tion­ing.

To make it easy to par­al­lel in the start al­ter­na­tor when needed, we mounted a switch and warn­ing light on the dash that closes a 200A con­tin­u­ous duty re­lay to make the se­cond al­ter­na­tor avail­able to sup­ply the load when needed by just flip­ping a switch.

With th­ese four sets of new com­po­nents and changes in­stalled, we can solve all the prob­lems we out­lined above by com­bin­ing th­ese com­po­nents in dif­fer­ent ways. Re­peat­ing the re­quire­ments we’ll see how each is solved.

list above,

so it’s hard to jus­tify giv­ing up the space for a se­cond gen­er­a­tor in a small boat. If we do end up need­ing the backup, the hours on our main will go up marginally, but the trip will be saved. It’s nice to not give up space for a se­cond gen­er­a­tor and yet still have the re­dun­dancy pro­tec­tion that comes from one.

Ef­fi­cient, light 240V loads: There are times when you’d like to run the oven for just 10 min­utes, but it’s just not worth start­ing the gen­er­a­tor for such a short pe­riod. The 240V in­verter is happy to de­liver the power and al­though the bat­tery draw is high, it’s short enough that it doesn’t re­ally con­sume that much power. It’s an ef­fi­cient way to de­liver the power for short pe­ri­ods with­out hav­ing to start the gen­er­a­tor. An­other us­age model is low loads when un­der way. A sin­gle air con­di­tion­ing unit draws less than 8A. It’s not worth hav­ing the gen­er­a­tor on 24/7 and hav­ing to change the oil ev­ery 10 days if you only need a small amount of power. The com­bi­na­tion of the 6kW 240V in­verter and the large on-en­gine al­ter­na­tors al­lows even fairly large 240V loads to be run any time with­out need­ing to start the gen­er­a­tor.

The com­bi­na­tion of in­stalling a 240V in­verter, up­graded ship’s ser­vice selec­tor switch, and a new charger ser­vice selec­tor switch, al­lows the boat to be run en­tirely on the 60Hz in­verter, while dual re­dun­dant 100A at 24V Master­volt Charge­Mas­ter 24/100s charge the bat­ter­ies.

The Master­volt charg­ers will run hap­pily on ei­ther 50- or 60-cy­cle, so the bat­ter­ies stay fully charged even on 50-cy­cle power while the boat con­tin­ues to op­er­ate at full ca­pa­bil­ity as a 60Hz sys­tem. We never need to start the gen­er­a­tor to use the oven or laun­dry, for ex­am­ple. The com­bi­na­tion of the charg­ers and the in­verter can run any ap­pli­ance at any time.

SHORE­POWER SHORT­FALL

Very low am­per­age shore­power in­vari­ant: Ex­tend­ing on the 50Hz/60Hz in­vari­ant point above, we can run on shore­power con­nec­tions as low as 10A at 240V or 15A at 110V even though our peak draw is of­ten near­ing 30A at 240V. Be­cause the shore­power is charg­ing the bat­ter­ies and the in­verter is pow­er­ing the house, in­stead of need­ing the shore­power to pro­vide the peak power re­quire­ments of the boat, we only need the av­er­age re­quire­ments. Of­ten, for ex­am­ple, when a hair dryer is turned on and, say, the wa­ter heater is al­ready on, the ad­di­tional 8A draw will cause the shore­power breaker to dis­en­gage. This is be­cause the shore­power is in­suf­fi­cient to meet the peak re­quire­ments of the boat.

If run­ning us­ing the bat­tery charger and in­verter pair­ing, as lit­tle as 10A is enough to power the boat even though our draws are of­ten ap­proach­ing 30A. Shore­power only needs to sup­ply av­er­age

“We’ve been AYB cus­tomers for over 10 years. They’ve main­tained the Pa­tri­cia K con­tin­u­ously over that pe­riod, plus we’ve stored her there in cov­ered fresh­wa­ter stor­age dur­ing win­ter and sum­mer months. They are ex­tremely cus­tomer friendly and they have es­pe­cially com­pe­tent long-term em­ploy­ees that meet sched­ules and are al­ways ready to give ex­pert ad­vice. And, as a bonus, their fa­cil­i­ties and lo­ca­tion are out­stand­ing!

Ama Natura on the hook in Port­land Is­land’s Princess Bay, Bri­tish Columbia.

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