Generating component lists given constraints / requirements?

lasitterlasitter Solar Expert Posts: 56 ✭✭
In the "Too much of a good idea not to have been thunk already" category ...

I figured that someone out there in internet land might have combined multiple sets of formulas based upon various given inputs, and from said inputs generate a list of power production capabilities given proper installation and use of batteries / panels of a certain capacity.

You are here ...

Related: I love this suncalc web site because you can enter any locale you want, and it will figure the position of the sun for any time of day or day of the year. I figured that if you could take this kind of information, and then combine it with the right sort of battery spec calculator and PV calculator, and power demand and a bunch of other things, you might be able to generate a report suggesting a ballpark configuration of ...

You need xxx batteries of yyy capacity with a zzz configuration.
You need xxx PV panels
You need xxx number of inverters of yyy capacity
etc., etc.,

This would be a great discussion point in terms making a shopping list and re-tweaking parameters to get the best possible outcome.

So who has the closest to something like this on the web?

Or: Where is a web page with the list of consultants that can figure this sort of thing out for the noobie?


  • PhotowhitPhotowhit Solar Expert Posts: 5,170 ✭✭✭✭
    Re: Generating component lists given constraints / requirements?

    Is this for a grid tied system? There are some pretty good ones for grid tied systems that include direction and angle of array that will help estimate the production. For off grid, there are many more variables since time of use comes into effect too often, and you must waste energy/ charge fully often.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, 660 ah 24v ForkLift battery. Off grid for @16 of last 17 years. Assorted other systems, and to many panels in the closet to not do
  • mike95490mike95490 Solar Expert Posts: 8,754 ✭✭✭✭✭
    Re: Generating component lists given constraints / requirements?

    You first have to start out with your LOADS. Easiest to figure them in Watt Hours

    Fan 35 watts 16 hours = 560 watt hours
    Fridge 100 watts 17 hours = 1700 watt hours (hint, shop for an energy star fridge, about 1Kwh )

    and so on.
    Powerfab top of pole PV mount | 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

    gen: ,

  • lasitterlasitter Solar Expert Posts: 56 ✭✭
    Re: Generating component lists given constraints / requirements?

    Photowhit: Yes, grid tied.
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