Solar Power Tantrum

bigDog

bigDog

Elder Lister
<rant> Kuna chida ya frequent power interruptions making my working from home experience hell. Kids cannot attend school smoothly because of frequent power interruptions. It reminds me of Kampala power outages a few years ago. </rant>

Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.
 
bigDog said:
<rant> Kuna chida ya frequent power interruptions making my working from home experience hell. Kids cannot attend school smoothly because of frequent power interruptions. It reminds me of Kampala power outages a few years ago. </rant>

Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.
Click to expand...
Bulbs: 10*7=70watts
Laptops: 20*5=100watts
Router: 20watts.

Total: 190watts.

The question you should be asking is what configuration will support these requirements.

And note that the statement Assume each laptop requires 400 watts per day means the same as assume each car travels 80km/hr per day.
 
Aviator said:
Bulbs: 10*7=70watts
Laptops: 20*5=100watts
Router: 20watts.

Total: 190watts.

The question you should be asking is what configuration will support these requirements.

And note that the statement Assume each laptop requires 400 watts per day means the same as assume each car travels 80km/hr per day.
Click to expand...

Sande Sana @Aviator . Wangwana wa Solar. Si mseme kitu? @zapp is this within your territory?
 
Aviator said:
Bulbs: 10*7=70watts
Laptops: 20*5=100watts
Router: 20watts.

Total: 190watts.

The question you should be asking is what configuration will support these requirements.

And note that the statement Assume each laptop requires 400 watts per day means the same as assume each car travels 80km/hr per day.
Click to expand...

@Aviator

Hujasaidia huyu jamaa umemkosoa tuu. He needed to be taken through the process of sizing the system.


The OP's question
Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.

@bigDog

You need to determine how much power you actually need per day. This is basically a summation of the product of the power rating (WATTS) of each appliance and the daily number of hours of use.

For instance in your case assuming that each of the laptop, router and lights will be used for 6 hours a day/night.

Your power need per day will be

5 laptops x 60 W (assumed) X 6 hours = 1800 Wh
10 Lights x 7 W X 6 hours = 420 Wh
1 Router x 20 W (assumed) X 6 hours = 120 Wh

Your total daily power need is 2340Wh = 2.34KWh I think this answers your question

I will go ahead and help you understand how to size a Solar PV system to power this needs.

How many Solar PV modules? what capacity?
If you have 6 hours of sunshine daily in average - the power output rating of your solar PV modules will be 2340/6 = 390 W Peak. This can be met by 4 PV modules of 100 Wp each or 5 PV modules of 80Wp each giving you 400 W peak.

How many batteries? what capacity for each?
The battery capacity is measured in Ah. If your system will be a 12 VDC system,
your needed battery capacity in Ah will be 2.34/12 = 195Ah.
However its not advisable to drain a battery 100%. it has adverse effect. We therefore size the system with a 70% percent level of discharge.
Hence our needed capacity will be 195/0.7 = 278 Ah. Its also understood that the sun does not shine 365days a year in july typically the sun will disappear for a few days. Hence our battery capacity should cover a few days without the sun typically 3 days. we call it days of autonomy
Hence our needed battery capacity now becomes 278x3 = 835 Ah.

Assuming that you want to use 100 Ah deep cycle battery, you will need 9 pieces which will give you 900 Ah capacity in total. I hope by now you understand that the system sizing is dependent on a number of factors. The most important being

1. Your location which determines your solar regime which influence how much power your PV array will generate per day.

2. Your needed level of autonomy which will determine your required levels of battery capacity to take you through the worst months.

3. Your system voltage - will the system remain DC or you will invert to AC? If AC you will have to factor loses during the inversion process.
 
kibinda nkoye1 said:
@Aviator

Hujasaidia huyu jamaa umemkosoa tuu. He needed to be taken through the process of sizing the system.


The OP's question
Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.

@bigDog

You need to determine how much power you actually need per day. This is basically a summation of the product of the power rating (WATTS) of each appliance and the daily number of hours of use.

For instance in your case assuming that each of the laptop, router and lights will be used for 6 hours a day/night.

Your power need per day will be

5 laptops x 60 W (assumed) X 6 hours = 1800 Wh
10 Lights x 7 W X 6 hours = 420 Wh
1 Router x 20 W (assumed) X 6 hours = 120 Wh

Your total daily power need is 2340Wh = 2.34KWh I think this answers your question

I will go ahead and help you understand how to size a Solar PV system to power this needs.

How many Solar PV modules? what capacity?
If you have 6 hours of sunshine daily in average - the power output rating of your solar PV modules will be 2340/6 = 390 W Peak. This can be met by 4 PV modules of 100 Wp each or 5 PV modules of 80Wp each giving you 400 W peak.

How many batteries? what capacity for each?
The battery capacity is measured in Ah. If your system will be a 12 VDC system,
your needed battery capacity in Ah will be 2.34/12 = 195Ah.
However its not advisable to drain a battery 100%. it has adverse effect. We therefore size the system with a 70% percent level of discharge.
Hence our needed capacity will be 195/0.7 = 278 Ah. Its also understood that the sun does not shine 365days a year in july typically the sun will disappear for a few days. Hence our battery capacity should cover a few days without the sun typically 3 days. we call it days of autonomy
Hence our needed battery capacity now becomes 278x3 = 835 Ah.

Assuming that you want to use 100 Ah deep cycle battery, you will need 9 pieces which will give you 900 Ah capacity in total. I hope by now you understand that the system sizing is dependent on a number of factors. The most important being

1. Your location which determines your solar regime which influence how much power your PV array will generate per day.

2. Your needed level of autonomy which will determine your required levels of battery capacity to take you through the worst months.

3. Your system voltage - will the system remain DC or you will invert to AC? If AC you will have to factor loses during the inversion process.
Click to expand...
another question, is this to supplement KPLC outages or its assuming the guy ata disconnect from KPLC lines
 
kibinda nkoye1 said:
@Aviator

Hujasaidia huyu jamaa umemkosoa tuu. He needed to be taken through the process of sizing the system.


The OP's question
Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.

@bigDog

You need to determine how much power you actually need per day. This is basically a summation of the product of the power rating (WATTS) of each appliance and the daily number of hours of use.

For instance in your case assuming that each of the laptop, router and lights will be used for 6 hours a day/night.

Your power need per day will be

5 laptops x 60 W (assumed) X 6 hours = 1800 Wh
10 Lights x 7 W X 6 hours = 420 Wh
1 Router x 20 W (assumed) X 6 hours = 120 Wh

Your total daily power need is 2340Wh = 2.34KWh I think this answers your question

I will go ahead and help you understand how to size a Solar PV system to power this needs.

How many Solar PV modules? what capacity?
If you have 6 hours of sunshine daily in average - the power output rating of your solar PV modules will be 2340/6 = 390 W Peak. This can be met by 4 PV modules of 100 Wp each or 5 PV modules of 80Wp each giving you 400 W peak.

How many batteries? what capacity for each?
The battery capacity is measured in Ah. If your system will be a 12 VDC system,
your needed battery capacity in Ah will be 2.34/12 = 195Ah.
However its not advisable to drain a battery 100%. it has adverse effect. We therefore size the system with a 70% percent level of discharge.
Hence our needed capacity will be 195/0.7 = 278 Ah. Its also understood that the sun does not shine 365days a year in july typically the sun will disappear for a few days. Hence our battery capacity should cover a few days without the sun typically 3 days. we call it days of autonomy
Hence our needed battery capacity now becomes 278x3 = 835 Ah.

Assuming that you want to use 100 Ah deep cycle battery, you will need 9 pieces which will give you 900 Ah capacity in total. I hope by now you understand that the system sizing is dependent on a number of factors. The most important being

1. Your location which determines your solar regime which influence how much power your PV array will generate per day.

2. Your needed level of autonomy which will determine your required levels of battery capacity to take you through the worst months.

3. Your system voltage - will the system remain DC or you will invert to AC? If AC you will have to factor loses during the inversion process.
Click to expand...

Bravo!!!!!
 
kibinda nkoye1 said:
@Aviator

Hujasaidia huyu jamaa umemkosoa tuu. He needed to be taken through the process of sizing the system.


The OP's question
Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.

@bigDog

You need to determine how much power you actually need per day. This is basically a summation of the product of the power rating (WATTS) of each appliance and the daily number of hours of use.

For instance in your case assuming that each of the laptop, router and lights will be used for 6 hours a day/night.

Your power need per day will be

5 laptops x 60 W (assumed) X 6 hours = 1800 Wh
10 Lights x 7 W X 6 hours = 420 Wh
1 Router x 20 W (assumed) X 6 hours = 120 Wh

Your total daily power need is 2340Wh = 2.34KWh I think this answers your question

I will go ahead and help you understand how to size a Solar PV system to power this needs.

How many Solar PV modules? what capacity?
If you have 6 hours of sunshine daily in average - the power output rating of your solar PV modules will be 2340/6 = 390 W Peak. This can be met by 4 PV modules of 100 Wp each or 5 PV modules of 80Wp each giving you 400 W peak.

How many batteries? what capacity for each?
The battery capacity is measured in Ah. If your system will be a 12 VDC system,
your needed battery capacity in Ah will be 2.34/12 = 195Ah.
However its not advisable to drain a battery 100%. it has adverse effect. We therefore size the system with a 70% percent level of discharge.
Hence our needed capacity will be 195/0.7 = 278 Ah. Its also understood that the sun does not shine 365days a year in july typically the sun will disappear for a few days. Hence our battery capacity should cover a few days without the sun typically 3 days. we call it days of autonomy
Hence our needed battery capacity now becomes 278x3 = 835 Ah.

Assuming that you want to use 100 Ah deep cycle battery, you will need 9 pieces which will give you 900 Ah capacity in total. I hope by now you understand that the system sizing is dependent on a number of factors. The most important being

1. Your location which determines your solar regime which influence how much power your PV array will generate per day.

2. Your needed level of autonomy which will determine your required levels of battery capacity to take you through the worst months.

3. Your system voltage - will the system remain DC or you will invert to AC? If AC you will have to factor loses during the inversion process.
Click to expand...
Excellent answer. I was too lazy to type this. But basically you have summed it up well.
Remember to advise him on the dangers of skipping a charge controller, or connecting multiple panels directly without blocking diodes.
 
kibinda nkoye1 said:
@Aviator

Hujasaidia huyu jamaa umemkosoa tuu. He needed to be taken through the process of sizing the system.


The OP's question
Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.

@bigDog

You need to determine how much power you actually need per day. This is basically a summation of the product of the power rating (WATTS) of each appliance and the daily number of hours of use.

For instance in your case assuming that each of the laptop, router and lights will be used for 6 hours a day/night.

Your power need per day will be

5 laptops x 60 W (assumed) X 6 hours = 1800 Wh
10 Lights x 7 W X 6 hours = 420 Wh
1 Router x 20 W (assumed) X 6 hours = 120 Wh

Your total daily power need is 2340Wh = 2.34KWh I think this answers your question

I will go ahead and help you understand how to size a Solar PV system to power this needs.

How many Solar PV modules? what capacity?
If you have 6 hours of sunshine daily in average - the power output rating of your solar PV modules will be 2340/6 = 390 W Peak. This can be met by 4 PV modules of 100 Wp each or 5 PV modules of 80Wp each giving you 400 W peak.

How many batteries? what capacity for each?
The battery capacity is measured in Ah. If your system will be a 12 VDC system,
your needed battery capacity in Ah will be 2.34/12 = 195Ah.
However its not advisable to drain a battery 100%. it has adverse effect. We therefore size the system with a 70% percent level of discharge.
Hence our needed capacity will be 195/0.7 = 278 Ah. Its also understood that the sun does not shine 365days a year in july typically the sun will disappear for a few days. Hence our battery capacity should cover a few days without the sun typically 3 days. we call it days of autonomy
Hence our needed battery capacity now becomes 278x3 = 835 Ah.

Assuming that you want to use 100 Ah deep cycle battery, you will need 9 pieces which will give you 900 Ah capacity in total. I hope by now you understand that the system sizing is dependent on a number of factors. The most important being

1. Your location which determines your solar regime which influence how much power your PV array will generate per day.

2. Your needed level of autonomy which will determine your required levels of battery capacity to take you through the worst months.

3. Your system voltage - will the system remain DC or you will invert to AC? If AC you will have to factor loses during the inversion process.
Click to expand...
You sir should do a proper/ comprehensive thread on solar power or share a simple casestudy for a simple 3bdr bungalow.
 
Last edited:
RANDY $ said:
You sir should to a proper/ comprehensive thread on solar power or share a simple casestudy for a simple 3bdr bungalow.
Click to expand...

I will consider this request though guess it will only interest a few listers

SmartSelect_20201121-172011_Pinterest.jpg
 
kibinda nkoye1 said:
@Aviator

Hujasaidia huyu jamaa umemkosoa tuu. He needed to be taken through the process of sizing the system.


The OP's question
Can someone tell me how much power I need to charge 5 laptops, a router and 10 x 7 watt lights? Assume each laptop requires 400 watts per day.

@bigDog

You need to determine how much power you actually need per day. This is basically a summation of the product of the power rating (WATTS) of each appliance and the daily number of hours of use.

For instance in your case assuming that each of the laptop, router and lights will be used for 6 hours a day/night.

Your power need per day will be

5 laptops x 60 W (assumed) X 6 hours = 1800 Wh
10 Lights x 7 W X 6 hours = 420 Wh
1 Router x 20 W (assumed) X 6 hours = 120 Wh

Your total daily power need is 2340Wh = 2.34KWh I think this answers your question

I will go ahead and help you understand how to size a Solar PV system to power this needs.

How many Solar PV modules? what capacity?
If you have 6 hours of sunshine daily in average - the power output rating of your solar PV modules will be 2340/6 = 390 W Peak. This can be met by 4 PV modules of 100 Wp each or 5 PV modules of 80Wp each giving you 400 W peak.

How many batteries? what capacity for each?
The battery capacity is measured in Ah. If your system will be a 12 VDC system,
your needed battery capacity in Ah will be 2.34/12 = 195Ah.
However its not advisable to drain a battery 100%. it has adverse effect. We therefore size the system with a 70% percent level of discharge.
Hence our needed capacity will be 195/0.7 = 278 Ah. Its also understood that the sun does not shine 365days a year in july typically the sun will disappear for a few days. Hence our battery capacity should cover a few days without the sun typically 3 days. we call it days of autonomy
Hence our needed battery capacity now becomes 278x3 = 835 Ah.

Assuming that you want to use 100 Ah deep cycle battery, you will need 9 pieces which will give you 900 Ah capacity in total. I hope by now you understand that the system sizing is dependent on a number of factors. The most important being

1. Your location which determines your solar regime which influence how much power your PV array will generate per day.

2. Your needed level of autonomy which will determine your required levels of battery capacity to take you through the worst months.

3. Your system voltage - will the system remain DC or you will invert to AC? If AC you will have to factor loses during the inversion process.
Click to expand...
Nice. On the same note, is windpower installation affordable to a common raiya? If so, what could he be requiring? Ahsande saidi kiongos
 
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