Batteries Electrical Engine Rebuilds Repairs

New Electrical System Phase Two

I’ve been waiting for over a month for the new batteries to be delivered. It’s a good thing because it has given me more time to think about how to go about upgrading and modifying the entire electrical system. I like to call it a spaghetti factory but it isn’t really that bad. All of the DC components on board have inline fuses and are wired to a circuit breaker. The AC system is lacking it’s own independent breakers but there is one right at the end of the shore power cable on the dock. The existing system could keep working by just swapping out the golf cart batteries every couple of years. So why replace everything? Mainly because the cost of the replacement, the fact that I can do it myself with wisdom from several reliable sources, and also because it is winter and I have plenty of time to get it done right. Once it is completed I will be able to add several other components in the near distant future and the new electrical system will be ready for them. All of the components will be on a very safe and dependable circuit. I can live off the grid for potentially weeks at a time without ever starting the motor, enjoying comforts like refrigeration, hot water, push button toilet flushing and lots of fans circulating air in and out of the cabin.

New circuit panel before trim installed
New circuit panel before trim installed

At first I thought I would just start by replacing the existing charging components and that would be enough but once I began looking at the circuit, I decided to add it into the project mix and ‘Break Out Another Thousand’. Not only will I have a new charging system and electrical system but I can also accommodate the future components that I will be adding at a later time. Most of the remaining   components will require an independent circuit to it’s own breaker, like SSB, radar, possibly some high powered LED spotlights, and maybe even an electric windlass. These may even get their own dedicated battery bank. Extending a modern system will be considerably easier to do than to attempt extending a legacy system made back in the 1970’s. I have already gone through some growing pains by trying to run a lot more 12 volt powered components. I’ve added a chartplotter, new toilet, freshwater pump, fans, circulation pumps, forced air, drain pump, another bigger bilge pump and six more low powered network components. I’ve also added solar and an AC inverter so now it’s time to take it to the next phase. Here is a list of new charging components and batteries:


  • Morningstar Tristar solar charge controller 60 amp with remote battery temperature sensor
  • Balmar Max Charge MC-614 alternator voltage regulator with dual remote battery temperature sensors for both banks and alternator temperature sensor
  • ProNautic P Series AC charger 40 amp for three banks and remote battery temperature sensor
  • ProNautic  Remote Interface
  • 2 – Mastervolt Slimline 200 amp-hour 12 volt AGM batteries
  • 1 Mastervolt group 31 12 Volt AGM 1012 CCA starting battery
  • Blue Sea Systems ML-ACR automatic charging relay 500 amp
  • Blue Sea Systems panel with GFCI AC dual pole main breaker
  • Blue Sea Systems AC panel with 4 – 15 amp breakers
  • Blue Sea Systems DC  panel with 8 – 15 amp breakers
  • Blue Sea Systems DC panel with 8 – 10 amp breakers
  • Blue Sea Systems  DC panel with 8 switches
  • Bus bars, terminal blocks, and fuses
  • Ancor Duplex and Triplex wire
  • Ancor single strand wire of different colors from 10 – 16 gauge
  • Ancor heat shrink ring and receptacle terminals
  • 20 and 30 amp DC breakers
  • Smartplug
New charging components
New charging components

Every wire around the entire boat has been traced. Each one meticulously labeled with either a positive or negative and name, e.g.- “big bilge pump +”. Some components are removed and wires bundled away from the switch panel. Everything except what I need to continue living on the boat has been removed from the 12 volt panel. I need to first remove the starting battery and clean up the wiring so I am close to a clean slate as possible. The old ACR, battery monitor and voltage regulator can be removed and only the wiring for AC and charging the old bank will be left over so over a weekend I can install new AC and DC panels, then wire up the bare minimum for being able to live on the boat. Once the minimum components are installed, I’ll install the new batteries. Then each component will be meticulously programmed, tested and permanently installed. After everything is installed and working again I will replace any suspect AC and DC wiring and then secure the entire circuitry.  It’s difficult to tell how long this phase will take. It took a year and a half just to get to this point, where I know the boat inside and out. To understand an entire electrical system of your offshore cruiser is essential to being able to troubleshoot any issues quickly and easily. I built the system so now I know how to keep it tuned and working well.

Bus, fuse and terminal block collection
Bus, fuse and terminal block collection
Cutting mahogany plywood
Cutting mahogany plywood

There are two projects in parallel at the beginning of the project; one is removing old circuitry and replacing wires that can be replaced without compromising the cabin in any way, and the other is rewiring with duplex from the components back to the panel. Some old wiring cannot be replaced because they are located inside of the mast or headliner so where they are accessible is where new wire is spliced and led to the new panel. The wire is then bundled together using zip ties and tie holders against a surface to prevent dangling or movement and eventually chafe.

Stencil for new panel board
Stencil for new panel board

Another project that had me side tracked is getting the wiring out of the bilge. There was once a group of wires that ran under the cabin sole but since I’ve decided to upgrade the electrical system, I’ve also decided to reroute the new wiring a few feet from the cabin top and then bring it down to the DC components. I hope the bilge never fills enough to go above the cabin sole but if it does, having seawater contact the electrical circuit would be mitigated so to me it seems like a logical choice while undergoing such an endeavor. The replacement wiring will also handle much higher amperes than the previous install so voltage drop will be less of an issue and the system will run safer and more efficiently than ever before.

An important part of the new wiring for the stove and hot water system is a circuit that will automatically switch on the forced air heater and water pump in the event that the stove raises the glycol temperature above 200 degrees and bring it back down to 180 degrees. The normal hot water temperature usually ranges between 100 and 140 degrees so this is just a failsafe measure to prevent potential damage to the hot water tank and pipes. In order to allow the pump and stove to have their own independent bypass switch, they require a blocking diode so current can be fed through the thermostat to power the components but if one of the components is on using a bypass switch, current isn’t feeding back into the other component. I will post something later on this subject. It’s been fun designing this heating system.

A big challenge to this project has been living aboard while disassembling the electrical system. The batteries are removed and the circuit panel is down to the bare essentials to keep the important electronics operating. At one point I had to connect the battery charger directly to the DC panel and set the charger to constant float so I could remove the old battery bank. Not ideal as it does not provide much current to the toilet macerator, but it works for the time being until I have a new battery bank installed. When I ran the new wiring to the bathroom and forward berth I had to empty all of the port side lockers so I could feed wire without obstructions.   What was once an organized boat then became a storage place for all of the electrical wiring and components until they are all installed. The lockers had loose wiring until it was time to secure the entire bundles. Every day the amount of stuff cluttering the living space is reduced, based on what is accomplished that day. Plenty of incentive to keep working on whatever I can until this project is completed.

Once the new DC wiring was in place, I was able to move on to the panel installation. First I had to locate a suitable piece of plywood that matched the beautiful hardwood already on the boat. Luckily we have a place in South Seattle called Crosscut Hardwoods that has a great selection of exotic plywoods so I sourced a five-ply 6’x4′ of mahogany. Then I needed to cut and size the new piece to fit into the locker, which luckily a friend offered to help out using hit table saw. Finally I had to trace out each new panel, the main switches, the ACR override switch, bilge pump switches, battery monitor, and finally the remote display for the AC charger. I’ve graduated to the panel installation and routing wires to it through a series of harnesses. I’m not going to go OCD on the final routing but it will certainly be cleaner than the prior configuration and much easier to add another component. There are more important things to do than tweak the panel wires so they are all bundled perfectly. As long as chafe is minimized and it’s easy to navigate the wiring, that will be enough for me. Once I have the new house batteries on the boat I can complete the project and add the new charging components. Phase three is adding the new battery bank and charging components, plus programming them for the proper charging voltage at each stage. My final post will cover these important steps.

2 replies on “New Electrical System Phase Two”

Tony: Interesting reading about your electrical work. I’ve been working on mapping out and cleaning up Chaika’s rat nest of wiring, but haven’t decided to take the plunge to replace the panel and as much wiring as I can reach, though I should.

Will, good to hear from you. Taking the plunge may bring you into a black hole of repairs. I must forewarn you that I only intended to replace my house bank. It has been great learning so much about the entire circuitry on Satori though. Now that I’ve gone this far I feel like I should pass this knowledge onto as many other Westsail owners as I can. Satori never went through any kind of refit like many have, so it’s nice to be up to date now.

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