Iíve been evolving the charging
system on my boat
for better efficiency, safety
, and with the ultimate goal of running my generator
a lot less. Also both my alternators were dead/dying so it was the right time to start over. My inquiry started with this thread: https://www.cruisersforum.com/forums...rs-218898.html
. Iíve read all the relevant resources suggested and learned a lot, and made some changes. Iím down to some last details and would like a sanity check. Hereís an overview diagram of my current
Note missing from this is that each alternator
has an MC614 regulator
with the voltage sense wires connected to the house battery
side of the isolator (not ideal). I also have a Balmar
SG200 battery monitor
. Itís good but not perfect. Once I drew it all out I noticed a few things. 1: There is a distinct lack of fuses
on main cables
. 2: There is no way my charger/inverter will ever charge my start battery. 3: If I run my generator
without the engine
switch on it will not charge my starter battery. Also there seems to be a lot of opinion that a diode-based battery isolator is not efficient and sometimes troublesome.
Iíve decided to eliminate the Promariner 2-130-2 isolator, add a Balmar
Digital Due Charge unit, and add a lot of fuses
. This is the plan Iíd like reviewed. Here:
The things Iím changing:
1. Notice both alternatorsí positive outputs now connect to each other (and are fused) just before the Main switch. Is this a non-no? I never run the generator and engine
at the same time, but I donít know if there is any risk of one alternatorís output feeding back into the other alternator
. The old isolator did not allow this. I donít think itís a problem, but just a nagging question. I have not seen a diagram of this sort of setup anywhere.
2. I will move the regulatorsí sense wires to the positive terminal of the house bank, and the negative power wires for the regulators to the negative terminal of the house bank so all line voltage drops are compensated for.
3. Adding the Digital Duo means my charger/inverter will now charge my starter battery.
4. Iíll also be adding Sterling Alternator Protection Devices to both alternators.
Other notes: I upsized the new alternators and limited them to lower capacities. The regulators are set to BAL=4 (20% reduction). Both regulators have temp sensors for batteries
and alternators. They should stay happy.