![]() No matter how small system you have, all positive wires between any equipment (MPPT, inverter, etc.) and the battery should be fused. The solar panel dc isolator switch is an electrical safety device that can manually disconnect itself from the modules in the solar photovoltaic system. Just make sure that the PV wires are properly sized for the maximum current you can have there, like I wrote in the beginning. Now, if you have one-two 100W/12V (12V nominal) panels in a string or something like that - so low voltage and low currents - (and no panels/strings in parallel), the potential danger is much lower so you might be fine with a direct connection to the MPPT charger. Fuse holders should not be used as a disconnector switch (do not open the fuse holders under load/when there is a current). These fuses are installed in fuse holders. ![]() If you have more than 2 strings in parallel, you should fuse each string, too, with the same gPV type of fuses and with the amperage calculated from the string Isc/panel Isc (does not hurt if you fuse each string even for only 2 strings in parallel). The fuse amperage depends on Isc of the PV array. For wires from the PV array (and PV strings), the correct type of fuse is gPV. It's a big difference.Īlso, all wires should be fused, including the PV array wires. Make sure that those are DC ratings (not ratings for AC) and for disconnecting under load. The disconnect switch must be rated at least for the PV array Isc and for the voltage you have there. In case there are issues, you need a way to safely disconnect the PV array even during the day. ![]() First rule: all wires should be properly sized (proper cross section/gauge) for the maximum current you can have there. ![]()
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