Battery Charging Without a Controller [RE-wrenches]

[Darryl Thayer]

HI all
I do not think this is correct.  I have a 2400 amp
hour set that I boil with 20 amps which is C/60 or
about 1.5% of the amphours.  
Use a controller.
Darryl

--- Doug Pratt <dmpratt at sbcglobal.net> wrote:
> Mark, the rule of thumb I've heard is that so long
> as the amperage
> output of your PV module is no more than 1.5% of
> your battery's amphour
> capacity, there's no chance of pushing the battery
> into overcharge. So
> in your example, if your battery is 20AH or larger,
> you're safe.
> (Disclaimer: I'm not positive that this rule applies
> to sealed
> batteries, the best choice for emergency power. And
> with the reliable
> little MorningStar SunGuard retailing for only
> $30... your choice.)
> Cheers,
> Doug Pratt
> 
> -----Original Message-----
> From: Mark Byington
> [mailto:markbyington at sbcglobal.net] 
>  
> Anybody have any experience with connecting a small
> PV panel directly to
> a battery for trickle charging?  I have a 5 watt ASE
> panel that puts out
> 16V at 0.3A and I want to power a small
> automotive-type inverter.  This
> is a manual backup system to power a fish tank
> (about 45 watts) during
> power outages only.
> 
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