Mostly Permanent Magnet Motor with minimal Input Power

[Khwartz]

Looks good ideas, Luc and nice project, your home boat all seasons you just have made a little confusion in your initial post, but significant while been an electrician mysel: it suppose it was not "48 volts 100 amp/hours lithium ion battery" but "100 amp*hours"

Cheer..

[gotoluc]

Looks good ideas, Luc and nice project, your home boat all seasons you just have made a little confusion in your initial post, but significant while been an electrician mysel: it suppose it was not "48 volts 100 amp/hours lithium ion battery" but "100 amp*hours"

Cheer..

I'm not sure I understand what confusion you see in my post?

The house battery needs to be 48vdc for the 5kw electric drive motor that is 48vdc. The battery bank will have maximum 100ah @ 48vdc
Where is the confusion?

Luc

[Khwartz]

You typed: "amp/hours" while it is "amps*hours" or "amp.hours" where the former are energy.

You were dividing while it is a multiplication: the battery can sustain 1 amp during 100 hours or 10 amps during 10 hours and theoritically 100 amp during 1 hour; it is each time the current intensity multiply by the duration, not the intensity of current divided by the duration, which gives something very different (electrical power for 1V).

[gotoluc]

Humm ... to me when I say a battery bank is 100 amp/hour it would mean it delivers 100 amps for 1 hour at the rated voltage.

I thought all battery A/H ratings are based on 1 hour?

Luc

[Poit]

It doesn't matter if you multiple or divide. 100 amp hour is 100 amps (at the designated voltage) for 1 hour... 100 divide by 1 = 1. 100 multiplied by 1 = 1

so, to say 100amp/hour or 100amp*hour is effectively saying the same thing. 100 amps, for 1 hour. and the math can be worked out from this for other draws.. so 50 amp draw would last for 2 hours etc

all that said.. this only works when talking about the battery in a manner of fact way.. i.e you KNOW the battery is 100amp hour....

if you were trying to figure out how large a battery is with only measurements. then its multiply.. for instance.. say, you know there is 50amp draw and it lasts for two hours....... to figure out the battery size its 50 x 2 = 100 = 100amp/hour battery...

and any ways... i always thought the slash (/) wasn't a divide sign, but more so, stood for a "for" sign... in my mind I read 100amp/hour as 100amp  FOR an hour