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Author Topic: Batteries  (Read 5465 times)

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AGelbert

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Re: Batteries
« Reply #90 on: March 15, 2018, 02:07:34 pm »
I've been following this discussion. I appreciate the input from a pro. David, please comment on Nickle-Iron as a PV storage choice.

And how big a bank do I need for my 4.8kW array with 5 hr sun? I was thinking two strings might be better than one. 48V.

I am probably going to do a grid-tie for our house in the canyon. I recently got a new roof (composition shingles). Any advice on the best racking attachment choices to avoid leaks?

The nickel Iron is a great chemistry but it shines best in charge discharge settings. For a grid connected system with battery backup its overkill. With an eye on doom it is worth considering though. at least twice the price of lead calcium which is the most common for data centres, elevators, hospitals etc all long life low usage batteries. Call me old fashion but I would probably suggest two strings of the less costly chemistry for redundancy. How much you store is always tricky. when we do net metered with battery backup we size the bank smaller say one day due to the fact the solar arrays for net metered systems are so large. In your case the scenario would be a grid connected inverter with the ability to sell back to the grid like the Radian:  https://www.youtube.com/watch?v=LeS-wGtlpLc from outback. Schneider and sunny boy have their versions. It charges up your battery first then feeds surplus to the grid. You then install a critical loads panel for what matters in your house just like for a backup generator. if power goes out you use the daytime hours to supplement you battery capacity by running everything that uses a lot of power during the day since the battery bank will be topped up within hours and the rest wasted. In your climate you might need to have smaller split air conditioners that can be run on solar you would run them full out while the sun is up and coast at night. Whole house units are real hogs on start up. The nice thing is even if you can't do grid tie you can grid zero  with the same setup which uses the grid to back up but feeds nothing back to it. That scenario is for when your utility is being difficult; utility push back to solar is real and growing. For mounts I like the flat plates with mastic and a drip cover. Usually you screw into a rafter and seal which can get messy if you miss but the flat plates allow you to go on the sheathing directly.  We use this one here: http://hespv.ca/fr-talon  but most suppliers have something similar.
Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life. Pr. 13:12

 

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