From: muratlanne@gmail.com   
      
    wrote in message   
   news:7loaqa5cok179l3ibl291ro69fga2a21a5@4ax.com...   
   > On Mon, 13 Jul 2015 17:29:31 -0400, "Jim Wilkins"   
   >  wrote:   
   >   
   >> wrote in message   
   >>news:9ra8qalbsc1h2gp5rp33ek02sht2sg38ri@4ax.com...   
   >>> On Mon, 13 Jul 2015 05:10:32 +0000 (UTC), danny burstein   
   >>>  wrote:   
   >>>   
   >>>   
   >>> A "smart" battery charger with capacity to run your load and   
   >>> recharge   
   >>> the battery at the same time would be the cheapest way to get what   
   >>> you   
   >>> want.  Set it to start charging at whatever point you wish.   
   >>   
   >>Can you name one?   
   >>   
   >>   
   >   
   > Not sold as a battery charger, but banggood.com  has a voltage   
   > regulated, current limited power supply (up to 30 volts, up to 5   
   > amps)   
   > for about $60US.   
   >   
   > The voltage can be set to the hundredth of a volt (batteries are   
   > usually fine with settings to the tenth of a volt).  The current   
   > limit   
   > can also be set finely, but in this application would likely be set   
   > to   
   > its maximum value.   
   >   
   > You should be able to parallel units for higher current.  I haven't   
   > yet needed to do that.   
   >   
   > I've used one for testing Peltier effect coolers.  It starts getting   
   > too warm to touch at loads of 50 watts and up, but that is easily   
   > remedied by a small 12 volt fan (think computer power supply or case   
   > fan).   
      
   Read this warning about charging batteries with the Mastech and Volteq   
   brands of Chinese power supply.   
   http://www.mastechpowersupply.com/linear-vs-switching-power-supply.html   
      
   I put a diode in series to protect the power supply regulator from the   
   battery if the grid fails.   
      
   -jsw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)