# Converting Watt Hours to Amp Hours.

• Question
• Updated 1 month ago
• In Progress
Info needed to determine Amp Hour rating of Ego Nexus Powerstation.
• 140 Points Posted 3 months ago

szwoopp, Champion

• 106,120 Points Official Response
Not sure what you are asking.  The Amp hours of the power station will depend on the batteries you are using.
• 310 Points I’m not quite sure I understand the question. Basically with 4 x 7.5 AH battery the power station can supply about 1700w for one hour. This is in an ideal world. If you lower the load the batteries will last longer. Hope this helps.
• 140 Points Most of my equipment has an amp rating not a watt rating and I was looking for a way to judge the capabilities of the Nexus in AH's.  I use 4 x 7.5AH batteries.
• 21,716 Points • 11,100 Points A * Volts = Watts
AH * Volts = Watt / Hours

7.5 AH * 56 V = 420 Watt Hours
• 310 Points Maybe it would be better if you could give an example of what equipment you would like to run on the Nexus. Also specify the amp rating and maybe I could try to calculate it as an example for you to use.
• 104 Points watts = volts times amps
similarly watt-hours is volts times amp-hours

the ego batteries are 56V and have their amp-hour rating on the side (for example 7.5 Ah, 5.0 Ah, 2.5 Ah)

so one 7.5 Ah Ego battery is equivalent to ...

56 Volts * 7.5 Amp-hours = 420 Watt-hours

My configuration is 2 7.5Ah batteries plus two extra batteries from a mower (4 Ah) and a string trimmer (2 Ah). So the total watt-hour capacity of my system is ...

56 Volts * (7.5 + 7.5 + 4 + 2)Ah =
56 Volts * 21 Amp-hours =
1176 Watt-hours

You can work from the AC side too. If you have a device that draws 5 Amps on a 120V circuit, that's 120V * 5A = 600 watts. for two hours of continuous use that would consume 2h * 600W or 1200Watt-hours of electricity. My almost 1200Wh setup would be almost enough to run that load for 2 hours (maybe 1h45 with losses due to the conversion of 56V DC to 120V AC)