Got this panel, I believe 200 watts, nothing on it indicating a brand. There are 4 flat contacts sticking out the back, I'm just trying to figure out on how to wire it without burning anything. Any suggestions?
Wildly guessing - It might need a 'junction box' - e.g. the black box glued on the back of a panel that connects the tabs (from the cells) thru diodes out to the +/- MC4 connectors like this - https://www.ebay.com/itm/234237556409?hash=item3689a576b9:g:rzwAAOSwqJVhaXwt Panels will have 2 or 3 or 4 tabs, you buy the appropriate Junction box and solder the tabs to the box and check the voltage/amps coming out
Each adjacent two are down and back long row of cells . Two outside tabs are overall panel pos and neg. Should be three bypass diodes, one between each tab wire.
You have to check which outer wires are overall positve and negative lines by voltmeter reading. Normally these tabs go into junction box with bypass diodes. Everything needs to sealed from water/moisture.
72 series cells, 6x12 array. about 37v Vmp, 45.5v Voc. Cannot estimate cell size from picture, but likely about 280-300 watt panel. Each cell should put out Isc of 40-45 mA per square cm of area in cell. Imp about 0.95 x Isc. Likely each cell 8 to 9 amps in full sun.