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If I'm generating 2x as much solar power as I need, what's the best way to utilize the excess energy?
I'm intending on putting in solar electrical panels on my home. I have a 12KVA UPS for storing the electrical power. But how do I save all of the power most effectively (preferably to heat my home) when I've got what I need in the way of electricity? We get 2450hrs/yr here but have very cold winters.
1. Convert to hydrogen (burn later)
2. Store as heat (in water or soil)
3. Some other way.
The size being 2x too big is a fiction of sorts due to the wide variation in the number of daylight hours from summer to winter, and the use of heating panels wouldn't be useful in the winter either in the -40 weather.
The size being 2x too big is a fiction of sorts due to the wide variation in the number of daylight hours from summer to winter, and the use of heating panels wouldn't be useful in the winter either in the -40 weather.
4 Answers
- roderick_youngLv 78 years agoFavorite Answer
Connect to the grid, and store any excess as a credit with your power company. That's like having a 100% efficient battery. Any other kind of storage is lossy.
Also, be sure to look at a map of "peak equivalent sun" such as this http://rredc.nrel.gov/solar/old_data/nsrdb/1961-19... when sizing your system. There is no way anywhere in Canada would get 2450 hours per year of peak sun. That's probably a figure for any sunlight at all, including weak morning and afternoon sun, and winter sun at a low angle. The usable sun for generating electricity may be half that.
- dooberheimLv 68 years ago
I would install half the number of electrical panels and install thermal panels in the other half's place. That will let you heat water or air much more efficiently than using electricity or hydrogen. PV panels are only maybe 15% efficient, while thermal panels can be 60-70%.
DK
- 8 years ago
Usually whatever you don't use is credited back to you from your local power authority.....In other words it will be taken off the following bill prior to you making the payment.
Source(s): I have solar panels