It is usually better to determine your watt hour usage instead of your Amp usage.
Working backwards if you plan on using all those loads at the same time then on a 12volt battery it would come to 240 watt/hours (12v x 20 amps) for each hour you run them. So for 5 hours that would be 1200 watt hours which is pretty big daily load for a battery system. Since you should not use more than 20% to 25% of the battery you would need a battery that could supply between 5000 & 6000 watt hours.
But if you say that each LED uses 12 watts (12v x 1amp), the pump uses 36 watts (12v x 3 amps), etc. then you can calculate how many hours you would use each load. Add them up and you get close to your daily watt hour usage.
Working backwards if you plan on using all those loads at the same time then on a 12volt battery it would come to 240 watt/hours (12v x 20 amps) for each hour you run them. So for 5 hours that would be 1200 watt hours which is pretty big daily load for a battery system. Since you should not use more than 20% to 25% of the battery you would need a battery that could supply between 5000 & 6000 watt hours.
But if you say that each LED uses 12 watts (12v x 1amp), the pump uses 36 watts (12v x 3 amps), etc. then you can calculate how many hours you would use each load. Add them up and you get close to your daily watt hour usage.
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