![]() ![]() If the load calculation supports staying at 200A, then you have a simple matter that the "full panel" situation is absolutely intolerable. You could retain your first panel and fit a second panel right next to it. If you can get 400 (320) amp service, that is typically handled by installing two 200A panels. However, the result of this load calculation may be that you just need bigger service. I can think of two facilities with 200A panels where it would be perfectly reasonable within their service. Most customers making this change have been ok with the costs and results but I had 1 customer that after spending +10k or more had the tankless removed because he liked the 80 gallon electric better.įirst, I would think about a load calculation for your house to make sure adding 150A of load does not justify adding additional service capacity. I would first check with the power company to verify your service can be upgraded without you having to purchase a larger transformer. The service drop and usually the meter base will also required to be changed. Because of the size of this load it is not as simple as just adding a sub from your existing main panel. From either of these you can feed your existing main that would become a sub panel (some rewiring may be needed to isolate the neutral from ground) a 2nd sub could be added to power your water heater and any additional loads for future use. In one large all electric home I had to install a 400 amp panel. Several homes I was able to use a 30/40 service panel 300 amps continuous / 400 peak I think some call these 320 amp services. I have installed similar water heaters and because of the large amp draw you will need a larger service a sub panel alone is not enough. ![]()
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