From: muratlanne@gmail.com   
      
   "bob prohaska"  wrote in message news:tfooek$2fvdo$1@dont-email.me...   
      
   In the course of testing a second ampinvt 800 watt pure sine   
   inverter charger some noises came out that sounded an awful   
   lot like arcing. I decided to take a look inside (finding   
   nothing obviously amiss) but realized that there's no visible   
   battery charging hardware. There's one big output transformer,   
   but only a few very small (sub-cm^2) core transformers on the   
   mainboard. The rated charging power of 15 amps at 14-15 volts   
   would I think call for something bigger, even if it's a fairly   
   high frequency circuit.   
      
   One thought is that the output step up transformer might double   
   as a step-down transformer while the inverter isn't active, as   
   when line power is available. Does anybody know how charging is   
   really done on gadgets like this?   
      
   Of course, documentation is non-existent.  The mainboard is labeled   
   JGY-LI1.5k V2.0 but my websearches hit nothing informative. I do   
   have some photos if anybody might be able to recognize the images.   
      
   Thanks for reading,   
      
   bob prohaska   
      
   -----------------------   
      
   The only gadget like that I have is the APC1400 UPS. It charges the   
   batteries to the programmed float voltage at up to 6A whenever plugged in,   
   whether On or Off. You won't know what yours is doing unless you measure the   
   current.   
      
   You could parallel an external charger and perhaps have more choice of   
   charging rate, float voltage and battery type. As long as it doesn't have a   
   higher voltage desulfating mode it shouldn't hurt the ampinvt, it's just   
   keeping a battery within its normal voltage range. If you don't trust your   
   wiring skills the battery leads on NOCO ($$) chargers end in ring terminals   
   that can be unbolted from the alligator clips and attached to the battery.   
      
   This has proven to be a good battery voltage, current and charge level   
   monitor, so far:   
   https://www.amazon.com/gp/product/B09P65M2YF/ref=ask_ql_qh_dp_hza   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)