Most homes require an electrical service of at least 100 amps. This is also the minimum panel amperage required by the national electrical code (nec). A 100-amp service panel will typically provide enough power for a medium-sized home that includes several 240-volt appliances and central air-conditioning.
Much depends on your listening habits and your speaker's efficiency. If you like loud uncompressed music and your speakers are 90db efficient, 200 watts is likely plenty of power for you. If you only listen to light classical, jazz and don't expect them to rock the house, 50 watts is adequate.
|Watts:||Amps (at 12V):|
|100 Watts to amps at 12V:||8.33 Amps|
|200 Watts to amps at 12V:||16.67 Amps|
|300 Watts to amps at 12V:||25.00 Amps|
|400 Watts to amps at 12V:||33.3 Amps|
500 watt hours is a standard battery size. This equates to 14 amp hours at 36 volts or 10.5 amp hours at 48 volt.
The amplifier should be rated at 700 watts per channel into 8 ohms for a stereo pair of speakers. A professional-level loudspeaker can handle transient peaks above its power rating if they occur.
If p is in kw, use this equation: amperage = 1000 × p / (1.73205 × v × cosφ × η). If p is in hp, using this equation: amperage = 746 × p / (1.73205 × v × cosφ × η). Substitute the corresponding values of your motor's specifications to find the full load current in amperes.
As long as you have an amp you enjoy, typically anything above about 30 watts will be more than enough for most situations. If you're playing extremely loud metal music, maybe bump up to 40 just to be safe.
A four-channel amp works to power: four speakers, two speakers and a subwoofer—you can use a four-channel amp to power a subwoofer and two rear full-range speakers by bridging two of the channels to power the sub.
Most led bulbs will have an amperage draw of around 0.2 to 0.6 amps at 120 volts.
Some volume control units also have impedance matching. This means they have a switch (normally on the back panel – but sometimes inside) which allows you to tell it you are connecting 2, 4 or 8 pairs of speakers to the one amplifier. Once this switch is set, you don't need to worry about overloading the amplifier.
Olivia Campbell is a passionate writer and social enthusiast residing in Toronto, Canada. She has a deep-rooted interest in people and society, with a focus on topics related to social justice, human rights, and cultural diversity.
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