Wednesday, March 21, 2012

Re: [Electric Boats] Re: ABYC high voltage specs

 

Popeye:
 
On my Thoossa 9000 system all the excitment happens at the controller box both inside:
 
and outside:
 
Connections to the motor are just two wires back to the controller likewise for the battery bank (except for the battery interconnects).  
 
Capt. Mike
 
 
From: Guillaume D Marais <gdmarais@gmail.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, March 20, 2012 11:47 PM
Subject: Re: [Electric Boats] Re: ABYC high voltage specs

 

Hi Eric,
 
Do you perhaps have a layout picture of the EP layout on your boat displaying the motor the generator the
with a list of what is what and where is what it will help us novices tremendously as i gues a number of guys
have enough bateries and wiring etc is hen befor the egg or is the egg befor the hen?
 
Thanks,
Popeye
On Tue, Mar 20, 2012 at 8:58 PM, Eric <ewdysar@yahoo.com> wrote:
 
Hi Tom,

ABYC's TE-30 is pretty clear about what is high voltage, as you can see HV AC systems are 300VAC+ and HV DC systems are 50VDC+. Every interpretation that I have heard focuses on nominal voltages so our typical 48V systems are covered under ABYC E11. Even without considering charging voltages, a fully charged 48V lead acid battery pack sits at 51.2V, although the voltage will drop below 50V with almost any propulsion load. My Li pack (probably yours too) rests right around 53V and stays above 50V with a 50A load.

Fair winds,
Eric

From ABYC's TE-30
"INTENT - This technical information report addresses AC and DC electrical systems used on boats alternating current (AC) systems operating at more than 300 VAC, but less than 1000 VAC, and direct current (DC) systems operating at more than 50 VDC but less than 1000 VDC, including battery banks, motors, and controllers for the purpose of propulsion."

--- In electricboats@yahoogroups.com, "Tom" <boat_works@...> wrote:
>
>
> A bit of thread drift:
>
> The last time our USCG rep visited us I asked him specifically about the "above 50V" specifications in the CFRs and the ABYC standards. Specifically, would they apply to a nominal 48VDC system that would charge to well over 50V?
>
> He said that the over 50V category was only meant to address AC installations. I thought this was strange, why not say so in the regs? It's not like anybody is running 55VAC house loads...
>
> -Tom
>




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