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  • #31
    Originally posted by SunEagle View Post
    You are assuming the cost of pv is only 3.5 cents/kWh.
    jflorey was using 2.9 cents/kWh, I think. I was trying to be more realistic.

    the cost to generate power from a battery is still pretty high and if you average in the number of days the pv system does not produce anything or very little, then the cost to generate power from the battery goes up because you may use more than 80% DOD and shorten the lifespan..
    Kauai has sun only about 60% of the time, according to currentresults.com/Weather/Hawaii/annual-days-of-sunshine.php
    But the contract already figures that in.

    We don't know yet what actual DOD that 100MWh figure assumed, but
    the other Kauai storage system, the 13 MW/52 MWh SolarCity/Tesla system coming on line this quarter,
    appears to be spec'd at 100% DOD at the output (so there's probably hidden margin inside, and the price includes cell replacements); see
    cooperative.com/public/bts/renewables/Documents/technologyl_advisory_dispatchable_solar_final_10_7 _2015.pdf
    If the new system is similarly spec'd at 100% of DOD, then that storage cost is getting pretty low indeed.
    17kw. I like science, but I'm no expert.

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    • #32
      I found that article that Dan mentioned.

      Heck the plant won't even be on line until 2018. And that cost of 11 cents / kWh is what Kaua'i's has agreed to purchase the power from it for. That doesn't necessarily mean that is the cost to generate or if the purchase will make that plant profitable. It will get them headlines and possibly more projects since the battery system manufacturer AES is supplying that part of the project.

      Dan please stop looking for articles that are pie in the sky. I would rather see proven technology that is already working. Other RE plants have boasted about what they will generate but have not hit their targets. This one may also fall into that category.

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      • #33
        Originally posted by SunEagle View Post
        Dan please stop looking for articles that are pie in the sky. I would rather see proven technology that is already working.
        I wasn't looking for it -- it hit me on the head

        Since you want stuff that's already online, I'll post an update next time Kawai brings one of these big storage systems online.

        17kw. I like science, but I'm no expert.

        Comment


        • #34
          Originally posted by DanKegel View Post
          Hrm. You said "So that means the actual cost of storage (since it represents about 11% of the power generated) is around 92 cents/kwhr. ..."
          but I'm not sure that 11% figure is accurate. How do you get that 25 cents / kWh for storage, exactly?
          28MW solar (about 168MWh a day) at 2.9 cents/kwh (best actual price) and 100MWh a day from batteries give you a price of 11 cents overall. Making the (oversimplifed) assumption that the power comes from both and adds up to 11 cents/kwh, that gives you 25 cents/kwh for the battery's contribution to the price.

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          • #35
            Originally posted by SunEagle View Post
            By the way how is your PV system doing with all that rain CA is getting?......
            streets and houses are full of mud. (my place, so far, doing good) Arrays producing very little power, less than 1Kwh for several days,
            that's what diesel fuel is for

            Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
            || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
            || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

            solar: http://tinyurl.com/LMR-Solar
            gen: http://tinyurl.com/LMR-Lister

            Comment


            • #36
              Originally posted by Mike90250 View Post
              streets and houses are full of mud. (my place, so far, doing good) Arrays producing very little power, less than 1Kwh for several days,
              that's what diesel fuel is for
              You might want to think about adding a wind turbine to the mix if that is even possible for your location.

              I hate to see someone that has built a nice off grid solar pv system but is held hostage to the weather.

              Comment


              • #37
                Not a lot of steady wind here, even storms, just do gusts. The genset is easier 355 days a year.
                Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
                || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
                || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

                solar: http://tinyurl.com/LMR-Solar
                gen: http://tinyurl.com/LMR-Lister

                Comment

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