> If you can, I suggest > to also test the new batteries using a decent load ( an incandescent 12V > automotive light bulb for instance - something in the region of 100W ; I > have one from my old car, when testing batteries I connect in parallel > main and high beam )
Cars are not wired for bulbs to use both filaments simultaneously, so presumably bulbs are not designed to operate with both filaments on, so bulb will get hotter than designed for, increasing burn/ melt/ glass fracture risk. I prefer to connect single filaments of 2 or more glass bulbs in parallel. I've collected half blown bulbs for decades. Tell friends & car service garages you'd like their old blown headlamp bulbs, when they have to replace for new; always just one filament of 2 blows in use. While 1 or 2 bulbs are sufficient for quick checking & calculating internal resistance of batteries, it's nice to have more bulbs in a collection, to build a mesh of parallel & series to adjust load current to usually 1/10th of battery's rated Amp hour capacity, for doing timed discharge tests. PS Now we're all replacing 230 V (or 110 in USA) incadescent bulbs for LED to reduce power, I save those too: May help make graduated test loads for inverters from solar cells + battery systems, or in case LEDs start to fail from premature aging during next pandemic or economic/societal disruption, or voltage surge (whether from fluctuations of human controlled power net, lightning surge or solar / EMP pulse etc). Cheers, -- Julian Stacey www.StolenVotes.UK/jhs/ Arm Ukraine, Zap Putin. Brexit broke UK _______________________________________________ Nut-upsuser mailing list [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
