Originally Posted by DotDun
Let us run some rough estimates at cost:
3kw of PV = $3000
3x 48v 50a mppt
6kwh of LiFePo4
2x mars etek 0907 motors = $750
2x brushless motor
controllers = $600
and connectors (normally can be salvaged for free) = $200
Not that I disagree with your over all point that electric
would have an over all long term lower cost. Mostly in that diesel fuel
, diesel engine repairs
and maintain are not cheap
But as someone that has completed a convertion some of your number are high and some low. I keep up with my cost to the penny. Now most of these numbers are general boat restore numbers and would have been needed with either a diesel or electric
Cost break down.
As space is limited on a boat you need high efficiencies panels
for a 3kw array it will run around $7000 for 20% effecient panels
The solar charger
numbers are right on.
The lithium numbers look high to me I got a 48kw pack for $10000
numbers will depend largely on the power you want so they look fine for the power you want.
But the comment on the cabling is way off. I have over $1000+ in marine
grade 4/0 and 2/0 cable that was needed for the electric convertion. The absolute last place you would want to try and save money
on the convertion is in cables
. Nothing would roast you controllers and destroy you investment faster then undersized and out of speck cables
and connectors. They are not cheap
but they are the very life's blood of the install.
Electric motors don't need to be winterized and have MTBF 10 times higher then the best diesels. The two biggest reasons that I expect my electric setup will pay for itself is fuel
and maintance cost savings. Even having a diesel worked on onces will set you back thousands. I could replace a motor on my setup for $900 by removing four bolts. And could have it rewound for a few hundred bucks. The controler would be similar trouble and cost. And both are 10 times less likely to fail in the first place. Plus I am quaddudent I would have to loose four motors or controllers befor I was dead in the water
I also priced Styler diesels for my boat and the electric setup was the cheaper of the two options. But I still need to buy a new generator
so the over all convertion cost may wind
up being similar.