Hello, I hope everyone's sailing season is going well!
I recently purchased a 1979 Cape Dory
27 and it came with no electrical bilge
pumps. I would like to rectify that situation with a well thought out bilge
system and believe I have the electricals worked out.
The physical system is pretty basic right now. I plan to have a small nuisance pump
at the bottom of the bilge. Physically higher than that by some amount will be a large crash pump
. The thought is that the nuisance pump running is not really a big deal, but if the crash pump should start then I want me, any crew, the whole marina/anchorage/state to know the boat
Notes: I haven't calculated current
at all points yet, or have distance runs, so wire gauge, switch/relay size + inrush current
, etc. if noted are just guesses right now. Since I view the dewatering system as "mission critical" "must never fail" I've created the following schematic that I hope will fill the following design requirements.
- Allows for future expansion of the boat battery system. ("Any" amount of "ins" can be attached to the bus bar BUS1_2)
- Allows for future addition of pumps. ("Any" amount of "outs" can be attached to the bus bar BUS1_2)
- Allows all pumps to draw from all batteries until depletion, bypassing any low-voltage safety systems.
- System runs independent of any battery selector switch and is always ON and cannot turned OFF.
- System maintains battery independence.
- If any battery should become disabled or the links to that battery are severed, allow all pumps to draw from any remaining batteries until depletion. Each cable, fuse, and isolator (diode) from a battery to bus bar BUS1_2 should be appropriately sized to carry the full current of ALL pumps.
- Design will prevent the user from accidentally disabling any pump (no "OFF" selection).
- Control panel will visually display what mode the pumps are running in and that voltage is available. (ex. "Green LED is ON" indicates pump is in AUTO mode and that there IS voltage)
- Control panel silently indicates when small/nuisance pump is running (amber LED)
- Control panel visually and audibly indicates when pumps are running manually (red LED and alarm)
- When large crash pump is activated the user is notified visually and audibly (red LED, siren loud enough to alert sleeping crew, hopefully helpful neighbors, the next town over, etc.)
- Exterior high-decibel alarm for crash pump can be manually shut off. Circuit will automatically reset when the crash pump has stopped running, preventing future alarms from being accidentally disabled by the user.