Being grid tied your meter usage for monthly billing is for every device that is operated during the month. The usual service entrance for most residential homes are either 100 or 200 amps at 240 volt single phase.
Your home residential secondary to transformer is grid island style connection thru a series of sub stations in step down KV and step up MV voltage transformers back to the power plant that it came from or the national grid system. The reason for these different voltage levels KW KV MV is that the higher the voltage the less the AMP draw for the same WATTAGE being driven.
Grid connected auto start generators use this same island style switching and monitoring with a switch called ATS (automatic transfer switch). The switch senses the grid power and when it drops aka goes off line the auto start generator kicks on and transfers the load to generator power and stops any backfeed to utility power.
The utility feed for these residential service connections are usually 7.2 KV primary voltage stepped down to KW by a transformer either overhead or underground primary KV to secondary KW. The residential amp load is figured as follows
(wattage/voltage=amperage or amperageXvoltage=wattage).
100 amp single phase is 24000 watts
24000/7200=3.33 amps at primary transformer side
200 amp single phase is 48000 watts
48000/7200=6.66 amps at primary transformer side
Your home residential secondary to transformer is grid island style connection thru a series of sub stations in step down KV and step up MV voltage transformers back to the power plant that it came from or the national grid system. The reason for these different voltage levels KW KV MV is that the higher the voltage the less the AMP draw for the same WATTAGE being driven.
These switches work a with contactor NC normally closed or NO normally open and can be matched to your main breaker for automatic transfer of electrical power from grid to generator. If this ATS switch were not in place when the power went off line the secondary utility wires would become energised if the generator was running meaning that the transformer also would become energised. That is why the ATS is very important for protecting and transferring electrical power.
Solar/wind is an investment that can legally lower or stop your grid tied utility meter from spinning. Some utilities companies dislike this as they want to you to continue paying them for peak and off peak billings as they see fit to charge you for there electrical power. Yet other utilities companies have what is called NET METERING where they pay you to legally feed power back into the grid with this island style connection
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| STEP UP TRANSFORMER |
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| STEP DOWN TRANSFORMER |
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| STEP DOWN TRANSFORMER |
This is how easy it is then to take solar/wind totally off grid out in the middle of nowhere and make your own grid thru step up KV transformers and step down KW transformers for ONSITE usage . By the higher the voltage and less the amp draw theories for the same wattage being driven then makes this all possible. In theory then by using battery bank float voltage dc to single or 3 phase ac 120/240/480 thru pure sine wave inverters matched to KW load back feeding a transformer aka LINE SIDE makes the KV voltage possible from it's KW source.
What makes this even better is the island style connection makes mupitail LOAD SIDE transformers possible anywhere. By taking this KV voltage to the onsite source location where the KW voltage is needed is less voltage drop on large acreages for homes, business, farms, ranches, hunting lodges, crop watering, telecom.
Contact Info
D B Electric
email www.offgridpowerdbelectric@gmail.com
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