Hi
While 48 volts makes built drop less of an issue than 12 or 24 volts, it's still incredibly important especially as the current goes up.
I have a 48 built system with 24 x 220ah blocks and we serised/paralleled them up two different ways just to check and were stunned at the difference, and I'm almost ashamed to admit I've worked in the electrical industry for years BUT as the attached article says when you're used to working with 110/220 it's seldom an issue.
Armchair experts will tell you "what difference can it make", please read the attached article and remember that theory is where you should start but practice I'd where you must finish so listen to both. Cheers
On 29 Dec 2013 08:24, "Sheya" <sheyagiggles@yahoo.com> wrote:
Hey Mike,Thanks for the response. I believe that since we have 8 (12V 200AH blocks) that would mean we have a total of 400AH at 48V. Would you agree thats right? We would have 2 blocks of 4 in series and those 2 blocks connected in parallel, does that make sense?Sheya and Jason
From: "mike@electricyachtssocal.com" <mike@electricyachtssocal.com>
To: electricboats@yahoogroups.com
Sent: Friday, December 27, 2013 6:45:01 AM
Subject: [Electric Boats] RE: system questions
I am surprised no one has responded to your inquiry and hope this will stimulate others. I know of at least two conversions of heavy displacement Morgan 41s by members of this group and they should have good advice for you. I believe this is the proposed system and your usage:
The motor is a continuous rated 15hp that is to say 11,200 continuous rated and likely about 12hp to the shaft. The boat is a Morgan 41 which often was supplied with a 45hp motor that likely drove at peak 30hp to the shaft.
The battery size is 200AH at 48v
You are looking to sail the boat as far as Alaska from your BC location.
This is what our computer projection says and I would encourage all vendors to share your projections for this boat.
Speed & Power
Kts-Watts
2.3-480
2.9-960
3.6-1920
4.6-3840
5.3-5760
5.8-7680
6.4-12480
6.8-17760
Hull speed 7.93
Your motor should push the boat at about 6.2kts in calm and likely about 4.5 in a mixed sea state and about 3kts against a poor sea state. The 200AH battery bank will push the boat at an 80% dod for about 22NM at 3kts and 14NM at 4kts.
Mike
Electric Yacht of Southern California
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