Originally Posted by SailingPNW
Unless you are running your engine
at high RPMs you should avoid using it to charge your batteries
. Diesels do not like to run at low RPMs and doing that for lengthy periods should be avoided, it can actually damage the engine
If you are sitting on hook nothing beats solar, if the initial cost is to high, get a Honda
, my guess is in a year if you spend much time at anchor
you will be wanting solar, having both is never bad.
The bit about running your engine at high rpm
is a myth. It's a shame that the engine manufacturers have such poorly written manuals
, but that's the way it is when English
isn't your first language.
I've been beating this drum, on this forum, for years. A diesel
runs "best" at about 80% LOAD, not 80% RPM
My 60hp engine produces about 40hp at 2600 rpm, and 60hp at 3600 rpm. If I want to run it at 2600 rpm, at about 80% LOAD, I'd want to absorb just over 30hp. At 1600, it produces somewhere around 20hp (by memory), which means that I'd want to be using about 15hp, for what is considered "Optimum" load. However, it doesn't take 15hp, at 1600 rpm to keep the engine at operating temperature, which is what you should be aiming for.
If you keep your light duty, marine
engine at operating temperature, it'll live a long and productive life. Slightly less long than running it constantly at an 80% load, but longer than running it constantly at 80% of maximum rpm.
Automotive engines, and pleasurecraft engines, (3600 rpm to 5000rpm) are rated at a higher rpm than you find in commercial
engines 600rpm-2200rpm, and they don't tend to last as long. So, unless you've got a ship engine, tractor/trailer engine, or train engine in your boat
... your goal should be 80% of LOAD, not rated RPM.
If you run it hard enough to keep the engine at operating temperature, you'll be fine.
Fleet maintenance/repair of Diesel
engines was, at one time, my job.
And, to reinforce my previous post. I vote for solar.