Low watt solar battery tender polarity
I have several battery tenders, solar and AC, that I use for my vehicles; trucks, ATV's, tractors, etc. The AC tenders detect and adjust the polarity. Does polarity make any difference with small, like 10 watt and 2 watt, solar panels? The reason I ask is that the alligator clips, red and black, are different for the different panels. I just got a 2 watt and using the alligator clips that came with it but my voltage reading is negative which tells me the polarity is backwards; black from the battery to black on my meter and red from the battery to red on my meter produce an negative reading. On my 10 watt it reads positive. Confused as to the difference in solar panels and if negative reading will damage the battery or if I should just switch clips to get a positive reading. Thanks and sorry to ramble but DC voltage is confusing.
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