# Excess Energy Saving from a constant energy source.

A Chamas
Hello everyone.
So i live in Lebanon, and since a long time now we have constant power cuts, almost half the day each day. For that the Lebanese made up a system in which each neighborhood has power generators providing electricity to the residents when the power is out. Usually the owners of these generators would charge an average of 100$/month for a 5A/220V AC subscription. You'd have circuit breakers on the street for 5A or 10A depending on the subscription, so it doesn't matter how much energy you use, you will have to pay the same, usually i use 2.5A on average and the excess energy goes as extra profit for the owner of the generator. My question is, how would it be possible to use the remainder of the 5A perhaps to store the energy when not needed and then when energy is needed to go beyond the 5A limitation. ## Answers and Replies Evanish Hello everyone. So i live in Lebanon, and since a long time now we have constant power cuts, almost half the day each day. For that the Lebanese made up a system in which each neighborhood has power generators providing electricity to the residents when the power is out. Usually the owners of these generators would charge an average of 100$/month for a 5A/220V AC subscription. You'd have circuit breakers on the street for 5A or 10A depending on the subscription, so it doesn't matter how much energy you use, you will have to pay the same, usually i use 2.5A on average and the excess energy goes as extra profit for the owner of the generator. My question is, how would it be possible to use the remainder of the 5A perhaps to store the energy when not needed and then when energy is needed to go beyond the 5A limitation.
2.5A at 220v is 550 watts of energy on average you want to store. 550 watts for 12 hours a day is 6.6 kwh of energy. Battery prices vary, but it should cost you more than $150 to store a kwh. Battery life varies on numerous factors such as how much you cycle them so that is something you need to pay attention to. The electronics needed might be difficult and/or expensive. I googled it and found a person who seems to be offering a kit that might do what you want, but they are asking 3,000 euros for a 5kwh kit. http://www.diyesskit.com/ Good luck. Last edited: A Chamas Thank you Evanish for your feedback. I think that this is a good starting point. But i have to give further precision. The power outage lasts 6 hours followed by 6 hours of electricity (around 15A breaker), so there will be no need for a big battery bank, a small battery bank capable of producing 2-3 Amps on top of the 5 A for a couple of hours enough to run the washing machine, a dryer or 1 AC unit would be ideal. My question is let's say i get a battery and a DC to AC inverter how should i wire it in a way, that the inverter would only send the right ammount of electricity on the same line as the generator is it even possible i mean can i put 2 sources of AC current on the same line or would i get a catasrophic failure since they the current might be out of sync and u get one in the positive phase while the other in the negative phase. Science Advisor Gold Member 2021 Award so there will be no need for a big battery bank, a small battery bank capable of producing 2-3 Amps on top of the 5 A for a couple of hours enough to run the washing machine, a dryer or 1 AC unit would be ideal. My question is let's say i get a battery and a DC to AC inverter how should i wire it in a way, that the inverter would only send the right ammount of electricity on the same line as the generator is it even possible i mean can i put 2 sources of AC current on the same line or would i get a catasrophic failure since they the current might be out of sync and u get one in the positive phase while the other in the negative phase. You are asking for help to do some seriously dangerous stuff .... I would STRONGLY advise you to reconsider your plans and keep the 2 systems separate. You are also underestimating the power requirements of a washer, a drier or AC unit and a battery's ability to provide useful power for any length of time Dave Evanish Thank you Evanish for your feedback. I think that this is a good starting point. But i have to give further precision. The power outage lasts 6 hours followed by 6 hours of electricity (around 15A breaker), so there will be no need for a big battery bank, a small battery bank capable of producing 2-3 Amps on top of the 5 A for a couple of hours enough to run the washing machine, a dryer or 1 AC unit would be ideal. My question is let's say i get a battery and a DC to AC inverter how should i wire it in a way, that the inverter would only send the right ammount of electricity on the same line as the generator is it even possible i mean can i put 2 sources of AC current on the same line or would i get a catasrophic failure since they the current might be out of sync and u get one in the positive phase while the other in the negative phase. Perhaps you would benefit from something called an off-grid inverter. Charge the batteries when the gird is up, switch over to the off-grid inverter when it's down. I haven't researched them enough to know if they will meet you need, but it's something you might want to look into although I think it's pretty expensive. http://energyinformative.org/grid-tied-off-grid-and-hybrid-solar-systems/ Here is something else that might interest you. http://electronics.stackexchange.co...esel-generator-with-a-pure-sine-wave-inverter Last edited: Science Advisor Gold Member Dearly Missed a dryer or 1 AC unit Unless those are gas appliances, they are LARGE loads not practical for a battery. Here in US$300 will buy a 3kw gasoline generator. Even that's not enough for an electric dryer but it'd run a small A/C .
If your dryer is propane or natural gas fired then you only need maybe ½kw for the motor.

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