Magnum Inverters - RF issues, charging params... [RE-wrenches]

[Larry Crutcher, Starlight Solar]

Christopher Freitas --- OutBack Power wrote:
> 
> Larry Crutcher, Starlight Solar wrote:
> > Trojan batteries are some of our top sellers to RV'ers and they call for 
> > 
> > 2.47vpc absorb voltage. The MS2012 is fixed at 2.43vpc. Not too far off 
> > but it would be nice to have it adjustable.
> 
> 2.43 VDC per cell is 14.58 VDC 
> 
> 2.47 VDC per cell is 14.82 VDC
> 
> The difference is 0.24 VDC (for a 12 VDC system)
> 
> This can be the difference between a wasted set of sulfated batteries 
> and a good healthy set of batteries. 
> 
> I know many wrenches who who never accept these low of a absorption 
> voltage for a system - I think the batteries would never be fully 
> charged by a generator.  I know many who routinely set the 
> bulk/absorption setpoint up in the 15 to 15.4 VDC level with non-sealed 
> batteries. 
> 
> Christopher

Hello Christopher,

I agree that charging at higher voltages is beneficial. However, I am 
dealing with lazy people (mostly) that will not even keep water in the 
batteries. Another problem is the cramped little space that these 
batteries occupy; not favorable for heavy gassing. Also, higher voltages 
may produce too high an internal temperature and damage the relatively 
small plates (T105's) especially as the batteries age. Even at 14.8 I 
have measured electrolyte temperatures at 115 degrees F. This simply 
will not work for the average RV'er. 

For the proactive battery owner, higher voltages will most likely equate 
to more battery life. In the last year I have been increasing absorb 
voltage at the off grid sites I service.  They mostly have Crown and 
Trojan L16 and a few Rolls 530's.

Thanks for the input.

Larry Crutcher
Starlight Solar
Yuma, AZ
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