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Need help with PV to power an air compressor - Page 2

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Posted by NotMe on May 22, 2015, 2:37 pm
 


If Neon John post it you can book it.  



Posted by Jim Wilkins on May 22, 2015, 2:54 pm
 

Industry statements on the relative life of VRLA vs flooded batteries  
vary. I'd like to read a knowledgeable outsider's experience.
-jsw  



Posted by Vaughn on May 22, 2015, 5:03 pm
 On 5/22/2015 10:54 AM, Jim Wilkins wrote:

Me too.  It takes time to obtain this experience though.

Until recently, my little PV system had big 6-volt AGM batteries that  
were five years old when I acquired them.  I got another ten years out  
of them!  I recently replaced them with name-brand flooded golf cart  
batteries because those were reasonable in price and easily available in  
my area.  It's been less than a year, and already I'm starting to  
suspect I made a mistake.

Check back with me in a few years and I will be able to add more to this  
story.

Vaughn



Posted by clare on May 22, 2015, 5:19 pm
 wrote:


You won't go wrong using high quality AGM batteries over flooded
batteries. I had nothing but grief with the flooded gc2H batteries in
the e-fiat.

Posted by Jim Wilkins on May 22, 2015, 9:19 pm
 
I can make flooded batteries last many years with frequent equalizing  
charges at around 1% or less of Amp-Hour capacity, i.e. 250 - 300 mA  
for a U1 riding mower battery. It appears to desulfate them too,  
though not completely. It requires an adjustable power supply with an  
ammeter, this is good:
(Amazon.com product link shortened)01108428&sr=1-53

My power source is an HF "45W" panel plus a homebrew LM317 regulator,  
or a 'dumb' charger that I made adjustable with a 3A Variac. I haven't  
found a suitable metered lab supply for under $5.
(Amazon.com product link shortened)30MY55C5VF5AN933T5

The battery in my truck is from 2002 and still runs the headlights for  
15 minutes without starting to droop rapidly, see the curves here:
http://hamwaves.com/qrp/portable.html  
I don't want to test it to death.

Flooded batteries require more attention, but they also allow it since  
I can add water and check specific gravity. Equalizing has been less  
effective for me on second-hand VRLAs.

http://batteryuniversity.com/learn/article/equalizing_charge  

-jsw




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