Why regular PoE Switches do not work in Solar Power System?

[@JasonsLabVideos]

Very valuable information !! Good work !

[@CaptainCrunch823]

Don’t most home solar installs use quality power inverters from one of the big names? Regular network gear works just fine in my SolArk and EG4 based solar system.

[@junkerzn7312]

Huh? No, this is completely wrong. Most regular PoE switches have AC adapters to generate roughly 52-56VDC for the switch and a DC input on the actual switch. You do not have to buy a special "PoE DC switch". You just bypass the adapter and plug the 48V solar system directly into the switch and you are done. Its like snip snip splice splice done. Literally. Zero voltage conversions. I know, because I do just this. Properly fused, of course. Anyone with any significant PoE hanging off a solar system is going to be using a 48V native battery system bus, not 12V or 24V. 12V/24V is fairly old school. If you are dealing with any real power, you go 48V LiFePO4. This battery chemistry in 16s has a charge target of 56.8V and will be 95% discharged at 48.0V. It is a perfect fit for PoE+ direct injection which is specified to operate at up to 57.0V. This is maximally efficient... there are zero voltage conversions. You literally can't do better. POE gear is designed to operate within the POE voltage range (50-57VDC, roughly). Minor differences in voltage will not cause any problems and with LiFePO4 the voltage really doesn't sag much across most of the discharge curve. -- If you have a 12V or 24V system well... fine. You can just use an AC adapter and lose roughly 15% in efficiency. Or you can use a DC-DC to generate 50-57VDC, bypass the AC adapter, and only lose roughly 7-10% in efficiency. It isn't terrible. PoE DC switches that take lower input voltages have a DC-DC built-in, but it won't be any more efficienct than just having an external DC-DC if you are using lower input voltages and injecting the proper voltage straight-away. You will still lose about 10% efficiency. -- Oh, and p.s. I have a few Linovision POE+ devices. They have *terrible* efficiency. They are incredibly inefficient for the DC-DC conversions they do. Extremely cheap circuit designs. It kinda annoys me, actually. In short, this video is just straight out wrong. -Matt

[@JohnWentworth]

This video is pure FUD just to sell stuff