As long as the connection doesnt create a problem. A series string needs to be made with the same capacity cells. Higher voltage enables a smaller current drain depending on how the power is managed. For example a buck regulator, as long as Vmax is not exceeded, draws the lowest current from the highest voltage. If the string is 200AH and you add a 100AH unit the entire string is now limited to 100AH because exceeding this will reverse bias the 100AH unit destroying it. A solution to this, using a switching regulator, would be to remove the 100AH unit when it is flat and then continuing on the shortened string.
Love is so short, forgetting is so long.
From: amracel <amracel@stuffandjunk.net>
To: electricboats@yahoogroups.com
Sent: Monday, June 11, 2012 10:27 AM
Subject: Re: [Electric Boats] Backups
But what about the deep cycle battery?
--- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
>
> starting batteries hate deep discharge.
> Really shortens their life.
> Â
> Love is so short, forgetting is so long.
>
>
> ________________________________
> From: amracel <amracel@...>
> To: electricboats@yahoogroups.com
> Sent: Monday, June 11, 2012 6:41 AM
> Subject: [Electric Boats] Backups
>
>
> Â
> Good morning!
>
> Well, I had my first 'oops!' yesterday. We ran the batteries out about a 1/4 mile from our slip. Luckily, the current and wind were behind us, so we could sail in at a brisk 1 knot. But I was wondering, as we did this whether or not I could have jumped the house batteries into the system to give us that extra boost to make it the rest of the way.
>
> My engine has 4-150AH Lifeline AGMs. My house has one quick start and one deep cycle battery (leftovers - might as well use them for the house!).
>
> Would I cause damage to the batteries, the house system, or my engine by connecting the two? If so, is there another alternative (one 'spare' agm?). If not, would the best way be to just have some battery cables nearby?
>
> Anne Racel
> 4 Degrees
>
--- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
>
> starting batteries hate deep discharge.
> Really shortens their life.
> Â
> Love is so short, forgetting is so long.
>
>
> ________________________________
> From: amracel <amracel@...>
> To: electricboats@yahoogroups.com
> Sent: Monday, June 11, 2012 6:41 AM
> Subject: [Electric Boats] Backups
>
>
> Â
> Good morning!
>
> Well, I had my first 'oops!' yesterday. We ran the batteries out about a 1/4 mile from our slip. Luckily, the current and wind were behind us, so we could sail in at a brisk 1 knot. But I was wondering, as we did this whether or not I could have jumped the house batteries into the system to give us that extra boost to make it the rest of the way.
>
> My engine has 4-150AH Lifeline AGMs. My house has one quick start and one deep cycle battery (leftovers - might as well use them for the house!).
>
> Would I cause damage to the batteries, the house system, or my engine by connecting the two? If so, is there another alternative (one 'spare' agm?). If not, would the best way be to just have some battery cables nearby?
>
> Anne Racel
> 4 Degrees
>
__._,_.___
.
__,_._,___
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