[RE-wrenches] 5 battery strings
Ray
ray at solarray.com
Mon Jul 23 14:08:40 EDT 2018
I don't think its worth all that rewiring now to preserve an imperfect
battery design that's probably only going to last a few more years
anyway. Just use those batteries up, and come in with a new single or
double string of larger batteries.
I know all of us wrenches would like to see amp circulation between
strings with some scientific accuracy, but is that in the customer's
best interest?
Ray Walters
Remote Solar
303 505-8760
On 7/23/18 10:33 AM, offgridsolar at sti.net wrote:
>
> There will be troubleshooting with this design. Probably easier to use
> it up and redesign. If my name was on the inheritance,
>
> I would do it now or at the minimum fuse the strings.
>
> On Mon, 23 Jul 2018 12:26:32 -0400, Chris Schaefer
> <chris at solarandwindfx.com> wrote:
>
>> And it's not a bad idea to add a shunt in each string for trouble
>> shooting down the road.
>> Christopher
>>
>> On Mon, Jul 23, 2018 at 11:24 AM, Steve Higgins <steve at surrette.com
>> <mailto:steve at surrette.com>> wrote:
>>
>> I would at least rewire them like this...
>> image.png
>> Remember all the parallel strings take offs must be the same
>> size/length, otherwise you are going to exacerbate imbalance issues.
>>
>> <http://www.rollsbattery.com>
>> Steve Higgins ⋅ Technical Services Manager
>> t+1.902.597.4020 m +1.206.790.5840
>> f+1.902.597.8447 esteve at surrette.com <mailto:steve at surrette.com>
>> <http://www.facebook.com/RollsBattery>
>> <http://www.twitter.com/RollsBattery>
>> <https://www.youtube.com/user/RollsBattery>
>> <https://www.linkedin.com/company/rolls-battery-engineering><http://www.instagram.com/RollsBattery>
>>
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>> On Mon, Jul 23, 2018 at 7:24 AM Jerry Shafer
>> <jerrysgarage01 at gmail.com <mailto:jerrysgarage01 at gmail.com>> wrote:
>>
>> Dave
>> Its a good idea to think of batteries the same way you do PV
>> Modules. Any time you have more then two strings they get
>> individual fuse protection, this is also good for diagnoses
>> purpuses too.
>> The current installation has no protection, safety and l
>> would change it.
>> As far as operation goes it works but thats not a exceptable
>> reason to leave it that way is.
>> Jerry
>>
>> On Mon, Jul 23, 2018, 6:56 AM Dave Tedeyan
>> <dtedeyan at taitem.com <mailto:dtedeyan at taitem.com>> wrote:
>>
>> Since we are on the topic of bad battery practices...
>> I may be fixing up a system that was both designed and
>> installed very poorly.
>> They have a 24V Outback VFXR inverter, and ten 12V AGM
>> batteries wired into
>> 5 parallel strings. I know that is a bad idea, but since
>> they already have the
>> equipment, are there any safety issues by re-using this
>> equipment? It is for a
>> grid tie battery backup system that will remain in float
>> most of the time. I assume
>> that the batteries will not last particularly long, but
>> is there any harm in using them
>> and then just getting new batteries once they fail?
>> Stringing is shown in the attached picture.
>> Cheers,
>> Dave
>>
>> *--*
>> **
>> *Dave Tedeyan
>> *
>> *Senior Engineer*
>> *Taitem Engineering, PC*
>> 10 Verizon Lane, Lansing, NY 14882
>> Voice: (607) 930-3481 x6
>> www.taitem.com <http://www.taitem.com/>
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>> --
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