Help with testing my 4.8 watt 12v solar panel?

A system designed for a 12 V lead acid battery system will often produce anywhere from 14 V to 24 V of voltage as that's what's needed for the bulk cycle of a 12 V lead acid battery charge. A top off or trickle charge is at 13.5 V and it's easier for a charge controller to bring the voltage down then up. Most solar battery bank systems are diurnal based on charging 80% of the battery on bulk charge during sunshine and therefore never get to a top off or trickle charge state unless it's a standby power system.

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I am also of the opinion that grid-tie would be unwise, not considering the fact that it's inherently a nasty notion, however considering the fact that you show up to have some fundamental misconceptions of how such methods are implemented. With a number of great exceptions, most grid-tied programs don't use batteries. Also, when the sort of method is mounted, it is ordinarily with rather more than 60 watts of panel. A exact variety of inverter is used, quite often compliant with UL 1741. There at the moment are micro-inverters made via Enphase, however even these are meant for greater than 60 watts. And you could need correct permits out of your nearby jurisdiction, and permission from your power manufacturer. Perhaps what you meant was once that you simply have been just aspiring to have a stand-on my own battery approach. In that case, i might say your panel is slightly small for that dimension battery - you could possibly more commonly need to cost at at the least 1/20 or 1/30 of the battery's ability, C. So you could be watching for 7 - 10 amps of charging current. A 60-watt panel puts out 5 at most. It will be higher to have two of these panels. At last, to your specific query. It could take about 2 weeks of fine solar to charge that battery from flat, or 1 week to top off the battery from 50% up to full cost. Of path, one will have to never drain a battery flat, even a deep cycle one - that ruins the battery without end.

You got a higher voltage than expected probably due to no load attached. Connect a 5W load (light bulb for example) to it and then measure the voltage. Now you should have 12V.