[Public-List] Batteries, solar panel.

[mahseer at kos.net]

It is not wise to connect new and old batteries together  as they are only as good as the weakest battery.  Having new batteries  of the same type connected in parallel will not cause any problems since they will equalize the same.  Regarding solar panel size do not forget to include power consumption used during the day when calculating charge capacity.
John Boor

Sent from my iPad

> On Aug 4, 2018, at 5:55 PM, Marcelo D. Gentinetta via Public-List <public-list at lists.alberg30.org> wrote:
> 
> My present batteries are approximately 2 years old. So if I add a second house battery and alternate the two as you mention, do I then need to add a second battery selection switch?
> 
>> On Aug 4, 2018, at 3:20 PM, Greg Hounsell via Public-List <public-list at lists.alberg30.org> wrote:
>> 
>> Marcelo;
>> 
>> Your house and start battery, from how you describe it, going through the
>> battery selector switch are not "in parallel" unless the switch is set to
>> "both". In terms of this discussion I would think of them as separate banks.
>> 
>> Before adding a second house battery, how old and used is the one you have?
>> The reason asking is that adding a new battery in parallel to an older
>> battery can potentially shorten the new battery's life if there is more
>> than say a couple years difference. An older battery slowly over time loses
>> it's capacity to reach 100% charge, nor hold charge as easily as a new
>> battery. If, say the existing battery can only ever be charged to 90% then
>> when you connect the new battery to it they will try to equalize. The
>> weaker drawing down the newer.
>> 
>> If you are not using them in parallel but as separate banks they can be
>> placed where most convenient. Some people do this and alternate which
>> battery gets used each day as the other gets charged.
>> 
>> Cheers
>> Greg
>> 
>> 
>> On Sat, Aug 4, 2018, 3:14 PM Marcelo D. Gentinetta via Public-List <
>> public-list at lists.alberg30.org> wrote:
>> 
>>> I agree with Michael that you can over analyze everything. Unfortunately,
>>> I have an analytical mind so it is a battle!.
>>> I am trying to keep the system as simple as possible though and trying to
>>> learn more about the whole process. Greg’s explanations have been very
>>> helpful. This brings me to another question. If you added a second house
>>> battery, where would you locate it in a liner boat and would it be in
>>> parallel to the present house battery which is already in parallel to the
>>> starting battery?
>>> 
>>> 
>>> 
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