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Home » Solar Energy » Grid connected roof top solar PV systems
Grid connected roof top solar PV systems
If we are looking at grid-connected roof-top solar PV systems for commercial/industrial sites, I think the best route to scale this up is to offer undersized solar PV systems without storage and operate these at high load factors with sole purpose of abating grid electricity, which is more expensive for industries/commercial entities due to cross-subsidies. Unless, hassle-free feed-in tariff schemes are not available in the state where the SEB is willing to take up the cost of last-mile connectivity with distribution network, investing into massive kW-scale installations on roofs will not make financial or administrative sense.
On the residential front, I think there is a need to target the urban centers which already own inverters/batteries. There is no denying the fact there must be a threshold, in terms of number of grid outage hours per year, beyond which it is more feasible to charge your batteries through your solar PV modules over a period of time instead of using the grid, when available. This will go a long way in maintaining grid health since all batteries will not begin charging at the same time using the grid after an outage. A wonderful test ground would be developers of residential societies that sell 24-hour backup at over 1.6$/kWh in some areas.
On the residential front, I think there is a need to target the urban centers which already own inverters/batteries. There is no denying the fact there must be a threshold, in terms of number of grid outage hours per year, beyond which it is more feasible to charge your batteries through your solar PV modules over a period of time instead of using the grid, when available. This will go a long way in maintaining grid health since all batteries will not begin charging at the same time using the grid after an outage. A wonderful test ground would be developers of residential societies that sell 24-hour backup at over 1.6$/kWh in some areas.
I have 600 VA inverter and 135 Ah battery installed as back up in my house for of course fans and Lights in the event of power outage. Will it make sense to switch over to Solar Panels for charging this system instead of through Grid power. I plan to use this system daily for say 4 Hours instead of only in the case of power outages. Also what if I double the battery size and increase the No. of hours used or add say TV to the use.
Since Mr Sharma has a battery and and an inverter,he needs to buy a panel ..Right?? It does not cost much since he needs grid power to charge battery anyhow,now,and spend money on that.
Right, I would need mainly PV Panels .I understand in case of 135 Ah the cost would be around Rs36K and in case of 2x135 Ah it would be around Rs70K. My question is does it make more sense to 'actaully' use the system regulalry with Solar system instead of only in case of power outages with Grid system.
Each charging cycle requires about 3.8 kWh of electricity. Assuming 100 days of charging cycles in a year (depends on frequency and length of power cut and ignoring depth of discharge), that's about 381 kWh annually. At Rs 4/kWh (modest assumption in some cities), that's 1524 Rs annual cost of charging battery alone (ignore O&M, replacement etc).
A 1 kW solar panel will give you about 4.25 kWh in a day (5 kWh/m2/day, 15% system losses). It'll cost about Rs. 80000 (?). That's an annual cost of Rs 3200 (not discounted). To make this feasible we should save at least 3200 per year.
If the all electricity generated is used (base load like fridges, ACs), then that's 1275 kWh generated every year which is equivalent to Rs 5,100. Since the value of electricity generated is higher than annual cost of panel, I'm inclined to believe that there is potential. Obviously there are many more factors and a more detailed analysis will be required. I think it could be feasible to even increase the battery bank size to accommodate excess generation and abate maximum grid electricity.
A 1 kW solar panel will give you about 4.25 kWh in a day (5 kWh/m2/day, 15% system losses). It'll cost about Rs. 80000 (?). That's an annual cost of Rs 3200 (not discounted). To make this feasible we should save at least 3200 per year.
If the all electricity generated is used (base load like fridges, ACs), then that's 1275 kWh generated every year which is equivalent to Rs 5,100. Since the value of electricity generated is higher than annual cost of panel, I'm inclined to believe that there is potential. Obviously there are many more factors and a more detailed analysis will be required. I think it could be feasible to even increase the battery bank size to accommodate excess generation and abate maximum grid electricity.
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