![]() ![]() Your inverter needs to have a watt rating higher than this total. You'd find your system's max power draw by summing the wattage of these two devices. This is the total watts being used if all your devices were running at peak power simultaneously.įor instance, let's say you plan to run a 200 watt fridge and a 75 watt fan off your inverter. If you know the wattage of all your devices, you can sum them together to get your system's total power draw. ![]() Knowing the wattage of your devices helps you do three main things when it comes to DIY solar power: During a cooling cycle, a fridge is using much more energy than when it's simply insulating. Fridges, for instance, enter a cooling cycle when the internal temperature gets too high. In other words, the device may not be always using that much current. It's important to know that the current rating listed on a device is usually its max current rating. ![]() So, in this example, your 12 volt fridge uses a max of 60 watts. To estimate its max power consumption in watts, you multiply its voltage by its amperage. You look at its product specifications and see that it has a max current of 5 amps. Knowing a devices wattage is necessary for estimating how much power it's using at a given moment, as well as how much energy it consumes overall.įor example, let's say you have this portable 12 volt fridge. It turns out your panel is a 100 watt solar panel. To calculate the watts produced by the panel in full sun, you would multiply volts times amps. Let's assume you have own the following solar panel that is rated at 18.6 volts and 5.38 amps. Here's a simple example illustrating how to convert volts to watts. The conversion formula remains the same.Īlternate abbreviation: P = V × I Example Occasionally, you may also see watts abbreviated as P instead of W and amps abbreviated as I instead of A. To convert volts to watts, simply multiply volts times amps. 5 Volts to Watts Volts (V)Ĭonverting volts to watts is easy - you just need to know the current in amps. The latest dc-dc converters are implemented using SiC MOSFETs to increase power density and reduce size.Here are some tables converting common AC and DC voltages to watts at various levels of current. The gate drive for these switches uses isolated gate drivers, for instance Si8239x, ![]() The HV switches are often implemented as fast IGBTs (as shown) or high-voltage Silicon Carbide (SiC) MOSFETs the HV switches on the primary side of the transformer require isolated gate drivers. The APM depicted uses a full bridge on the high-voltage primary side of the transformer, and a full-bridge synchronous rectifier on the low-voltage secondary side of the transformer. In some applications like a hybrid electric vehicle (HEV), the dc-dc can be run in reverse to boost the power from a 12 V domain to a 48 V or HV domain, to assist in starting or to provide backup power. 100 kHz) to keep transformer magnetics sizes minimal. Switching frequencies can be relatively high (e.g. Isolation between the HV input and the LV output of the converter is accomplished using a transformer. The return/ground for the low-voltage side is normally connected to the vehicle chassis, so galvanic isolation between the LV side and HV side is required for safety, as well as for protection of the LV controller. When under medium to heavy loading, APM may be in the 2 to 3 kW range with expected efficiency in the 92-95% range. Why Isolation is Critical in the Auxiliary Power Module ![]()
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