[Healeys] Electrical problem NON HEALEY

[Kees Oudesluijs]

That is a good summary of what is happening.
Kees Oudesluijs

Op 30-9-2023 om 20:38 schreef Roland Wilhelmy:
> Each battery has to deliver 22.5 amps.  The nine batteries are in 
> series.  The voltage adds but the current is constant .  Then you 
> correctly add the currents for the two parallel circuits.  20 minutes 
> at 23 amps will quickly discharge your batteries.  At high discharge 
> rates you don't get the advertised amp hours.
> -Roland
>
> On Sat, Sep 30, 2023, 9:06 AM Michael Salter <michaelsalter at 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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