I believe you&#39;ll have to modify the charging circuit as usually most UPSs have an IC as a charge controller controlling rate of charge and preventing overcharging etc...discharging may not be a problem but the charging might require a mod...maybe due to a higher charging current? I&#39;m not an elec guru though...just my thots...<br>

<br>On the other hand if you want to support a higher wattage than designed then you also have to mod the discharging circuit as well to accommodate the higher current...maybe the charge/discharge controller is built into one IC so that might be tricky.<br>

<br>You could also consider going for inverter solutions like the ones on <a href="http://chekelea.com/index.php?_a=viewCat&amp;catId=28">http://chekelea.com/index.php?_a=viewCat&amp;catId=28</a><br><br>So confirm first from an electronics buddy before you hook up a 1kva UPS to 6 12-volt car batteries in parallel... :) You could undercharge them, burn your charging circuit, or end up generating crazy amounts of hydrogen (maybe unlikely)<br>

<br><div class="gmail_quote">On Sun, Apr 18, 2010 at 23:54, Job Muriuki <span dir="ltr">&lt;<a href="mailto:muriukin@gmail.com">muriukin@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">

How practical is replacing a UPS battery with one with higher capacity in order to get longer battery life using same equipment. Say I want a 1kva ups to last 6hrs or over. WIll it work or will i have to change a circuit?<br>


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