Originally Posted by DougR
As Sartorst has stated, " Surely you jest".........
Sorry to say it but I think this plan has all the making of a catastrophe.
First off, the sea water
pump on the D2-55 is gear
driven and is not connected to the belt. The belt driven pump is the coolant
circulation pump, and this will be somewhat more difficult to replace with an electric pump.
Yes, looked in manual and you are right.
It makes it easier - circulation pump does not need high gpm rating and has no head
, it is a closed system.
I just don't like the idea that 2 important devices share the same belt.
Secondly, a 500 amp alternator is probably well beyond the power capacity of the serpentine belt on the front of the engine, and probably also beyond the pto capability of the front end of the crankshaft. Think of it this way: 500 amps @ 14 volts is 7000watts. Then, if we're generous and say the alternator is 65% efficient, we have to input almost 11000 watts mechanical into the alternator to get the 7000 electrical output. So you want to pull 11kW or about 14.5 hp off the front of the crankshaft. Without going to my application books for the D2-55 engine, I would say you are asking for a broken crankshaft.
The new alt belt is 12-groove, so crankshaft pulley to be changed to 12-groove. Truck belt.
Load depend on the gearing of the alternator. It produces 570 amp at max rpm
. At mid-level it produces 400 amp. At iddle it produces and drags almost nothing. There is a remote
switch to activate it (to switch off during docking).
Brake crankshaft? It is not broken when you apply 55hp to your saildrive
. It is not broken when you catch a rope
on a prop. Why would the alternator brake it?
If I had to make a recommendation, I would suggest installing the Volvo extra alternator kits on both engines. This gives you an extra 230 amps capacity (115 amps each) added to the existing 230 amps for a total 460 amps capacity. If you need more than that, add a generator or solar panels.
Extra mount kit cost $1200 from Volvo for 3-4 simple pieces. No way since the alternator costs $500.
I have two engines, but I only use one on the way. Mainly the right one (water heater).
I have 800ah lithium, so with 500A alt can change it in 1 hour. Also cook on the way, use A/C in hot climate, make water.
I have the 5kw generator and 900W solar
. But generator makes noise
, and solar
is not enough for our all-electric appliance boat.
The advantage of this is that it's already engineered and tested, doesn't void your warranty, doesn't destroy your engine, and doesn't cause your charging alarm buzzer to drive you crazy all the time.
I am out of Volvo warranty already, and I can do whatever I like - it is my boat, not Volvo's.
How about the other idea?
I replace my stock 110A with Leece 275A (same 6 groove belt and pulley).
I will check the belt slippage and wearing - maybe I can keep the circ pump on the belt?
Then I will add another 275A on extra belt/pulley if I need to.