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Many thanks to all who helped with this problem. I now have lots of ideas
of what to check.
Hopefully I'll get to the bottom of this problem soon and get back to
installing EFI in my BN2.
M
On Sat., Sep. 30, 2023, 11:39 a.m. Michael Salter, <michaelsalter@gmail.com>
wrote:
> This group has been a huge help in the past and I am wondering if
> there are any electrical guys out there who can help me with a DC
> electrical problem.
>
> I'm trying to help my BIL with the propulsion system for a 30 ton
> wooden boat on our lake.
> This 100 year old boat was originally steam powered but in keeping
> with modern times it has been converted to electric propulsion.
> It is fitted with a 106 volt DC motor
> At normal cruise the motor draws 45 amps.
> It has eighteen 220 amp hour AGM batteries.
> The batteries are arranged in 2 banks of 9 in parallel so each bank
> produces 108 VDC
> By my calculations ...
> For a total of 45 amps each bank would deliver 22.5 amps.
> Consisting of 2.5 amps from each of the 9 batteries.
> Each battery is 220 amp hours.
> Presuming that you want to avoid discharging below 50% the usable
> capacity of each is 110 amp hours.
> So my calculation for the running time is 110/2.5 = 44 hours !!!!
> It only runs for about 20 minutes before the amperage starts dropping
> off rapidly.
>
> Are my calculations correct?
> If not, where are they wrong?
>
> Thanks
>
> M
>
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<div dir=3D"auto">Many thanks to all who helped with this problem. I now ha=
ve lots of ideas of what to check.<div dir=3D"auto">Hopefully I'll get =
to the bottom of this problem soon and get back to installing EFI in my BN2=
.</div><div dir=3D"auto"><br></div><div dir=3D"auto">M</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat., Sep. 3=
0, 2023, 11:39 a.m. Michael Salter, <<a href=3D"mailto:michaelsalter@gma=
il.com">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">This group has been a huge help in the past and I am wonderin=
g if<br>
there are any electrical guys out there who can help me with a DC<br>
electrical problem.<br>
<br>
I'm trying to help my BIL with the propulsion system for a 30 ton<br>
wooden boat on our lake.<br>
This 100 year old boat was originally steam powered but in keeping<br>
with modern times it has been converted to electric propulsion.<br>
It is fitted with a 106 volt DC motor<br>
At normal cruise the motor draws 45 amps.<br>
It has eighteen 220 amp hour AGM batteries.<br>
The batteries are arranged in 2 banks of 9 in parallel so each bank<br>
produces 108 VDC<br>
By my calculations ...<br>
For a total of 45 amps each bank would deliver 22.5 amps.<br>
Consisting of 2.5 amps from each of the 9 batteries.<br>
Each battery is 220 amp hours.<br>
Presuming that you want to avoid discharging below 50% the usable<br>
capacity of each is 110 amp hours.<br>
So my calculation for the running time is 110/2.5 =3D 44 hours !!!!<br>
It only runs for about 20 minutes before the amperage starts dropping<br>
off rapidly.<br>
<br>
Are my calculations correct?<br>
If not, where are they wrong?<br>
<br>
Thanks<br>
<br>
M<br>
</blockquote></div>
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