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RS-485, also known as TIA-485(-A) or EIA-485, is a standard, originally introduced in 1983, defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced , and multipoint systems are supported.
By way of example, a 150 volt PV array connected to an MPPT charge controller can be used to charge a 24 or 48 volt battery. Higher array voltage means lower array current, so the savings in wiring costs can more than pay for the controller. [citation needed] Charge controllers may also monitor battery temperature to prevent overheating.
The Multi-Point Interface – Siemens (MPI) is a proprietary interface of the programmable logic controller SIMATIC S7 of the company Siemens. [1] It is used for connecting the stations programming (PC or personal computer), operator consoles, and other devices in the SIMATIC family. This technology has inspired the development of protocol ...
The controller, which usually has only an OUT connector, is connected via a DMX512 cable to the IN connector of the first slave. A second cable then links the OUT or THRU connector of the first slave to the IN connector of the next slave in the chain, and so on.
Solar cell phone charger. Solar cell phone chargers use solar panels to charge cell phone batteries.They can be used when no electricity supply is available—either mains or, for example, a vehicle battery—and are sometimes suggested as a way to charge phones without consuming mains electricity, unlike electrical cell phone chargers.
Connectors are typically attached by crimping, though soldering is also possible. The MC4 connector is UL rated at 1500 V DC and up to 95 A with the 6AWG PV Cable. MC4-Evo 2 has both UL and IEC certification ratings of 1500 V DC and up to 70 A with 10mm² PV Cable, depending on the conductor size used in pairs.