[RE-wrenches] Battery Specific Gravity versus Electrolyte Level

[Ray]

Dave makes a good point; I also don't recommend opening the cells while 
they are charging at a high rate.   I like to get SG readings with the 
electrolyte being mixed by bubbling, but I turn off the charging 
sources, and let it settle down for a few minutes, before opening caps.

And I second Steve's comments: over charging and over filling the cells 
can both lead to more problems than EQing might solve.

Ray Walters
Remote Solar
303 505-8760

On 2/9/21 10:35 AM, Dave Angelini Offgrid Solar wrote:
> That does not sound  best to me. I get the point but there are much better
> ways. Not good for you to be close around a bank in EQ. If you are checking
> water level every month the level should not be really low. You do this in
> case you miss a cell a month back! You should be counting as the water goes
> in to see if you have put about the same amount in. I have never noticed
> any advantage to mixing the cells after watering. They will get mixed the
> next day. If this concerned you, you could run a 30 minute absorb after
> watering.
>
> I like to EQ before watering so my customer does not over fill and start
> the corrosion process. Just open all of the cells and look before they EQ.
>
> I also like to mark 2 of the lower SG cells and 2 of the good ones. This
> makes it easier for my clients to check the bank. Once every summer or 2
> they need to look at all of the cells. Summer is best because it is the
> time when you can do long corrective EQ's if you find trouble.
>
>
> Dave Angelini Offgrid Solar
> "we go where powerlines don't"
> http://members.sti.net/offgridsolar/
> e-mail offgridsolar at sti.net
> text 209 813 0060
>
> On Tue, 9 Feb 2021 05:36:39 -0800, Mark Frye <markf at berkeleysolar.com>
> wrote:
>> My Rolls manual says:
>>
>> "It is recommended to water the battery cells half way through the
>> equalization. This is to
>> assure the water is completely mixed into the electrolyte."
>>
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