Jump to content

gallderhen

Members
  • Content count

    24
  • Joined

  • Last visited

About gallderhen

  • Rank
    Member

Recent Profile Visitors

416 profile views
  1. Which batteries should I buy (rhetorical question)

    Question regarding the Pylontech's: On the solaradvice website it says for a pylontech unit "Not for off grid use" Why would that be? I also see they have a very specific list of inverters to pair with, before they'll honor the warranty. -G-
  2. Thought I'd share the experience a bit So my parents decided to go solar on the geyser, but they live in the northern side of Pretoria where it gets extremely hot in summer (36C in the shade). The feared that this would mean that the normal flat panel and evacuated tube systems wouldn't work (or rather work too well) . So they agreed upon the Geyserwise PV installation. Installed are 4 260W panels, connected to a little inverter, which is then connected to a Titanium element for the 150L geyser. They say it reaches about 60-70 degrees during the day, and around 5am its still sitting at 52 degrees. -G-
  3. News24 Is this really true that it could happen? -G-
  4. Starting a new system from scratch

    I doubt it, My previous fridge-freezer was a Bosch which lasted me 14 years before the wife decided its time for a double-door fridge, and I didn't even service it once. Brother has it now as a backup fridge, and its still going strong he says (so its 15 yo now) -G-
  5. Starting a new system from scratch

    Hi, I once did a calculation of expenses vs Eskom. If you take a modest 6% increase in Eskom tarrifs and a modest 6% increase year on year for equipment, then assume that your equipment will last 20 years (with proper care), and we assume that your monthly Eskom bill is R700, you're expenses on solar equipment bought should not exceed R160k or something like that. And thats R160k cash, not financed. That should save you enough money to get you ahead of the curve and pay for the next replacement in 20 years time, theoretically. -G-
  6. 50 tons, 700KWh EV truck

    https://arstechnica.com/cars/2017/09/this-cement-quarry-dump-truck-will-be-the-worlds-biggest-electric-vehicle/ Generating a net of 10KWh per trip, not bad... -G-
  7. Looking for 310W Solar panels

    I haven't bought panels myself yet, but I tend to go drool at these pages https://powerforum-store.co.za/collections/solar-panels?sort_by=price-descending http://www.sonopsolar.co.za/product-category/all-products/solar-panels/?orderby=price https://solaradvice.co.za/shop/solar-power/solar-panels/?orderby=price -G-
  8. Which batteries should I buy (rhetorical question)

    A mybroadband forumite pointed me to the Mecer GCL E-KwBe Lithium battery as viable alternative. Bit heavy on the price side (R47k odd excluding installation if one wished) but its a usable 5.6KWh battery, with 10 year expected life span. And its not LiFePO4, but NCM per the specs. -G-
  9. BYD lithium batteries

    Howdy, Has any of you heard of, or has experience with the BYD B-Box lithium batteries? Found this Aussie blog about them: https://www.solarquotes.com.au/blog/byd-brings-b-box-battery-battleground/ Seems like a pretty big company ($22bil market cap) -G-
  10. Axpert grid question

    Yo, This is perhaps a rather silly question, but can an Axpert inverter be connected on the grid side via wall socket? What I'm trying to get at is the following: I've got a computer sitting in the granny flat of our home and as far as I can tell, the granny flat is running off of 1 20A breaker (it only has 1 or 2 wall plugs). I only want to run this one computer off of an Axpert with batteries (for loadshedding purposes), as the other plug gets used for heavy duty stuff (like ironing) so wanted to know if its possible run the Axpert off of the 1 plug without having the wire it into my DB? Or can it only be wired into the DB? Thanks in advance. -- Hein.
  11. Batteries

    This is pretty much what it boils down to. In my opinion there is no real benefit currently to go battery-offgrid in urban areas, if you are trying to save on electricity. In the end you don't save that much and you'd actually save more by changing your usage behaviour and running all of the things that can be run, during the day on solar panels, leaving only the essentials for night-time usage. The only time battery-offgrid will be of benefit in the suburbs, is if you go all-in and plan for the next 30+ years. But that is alot of upfront capital which is out of reach for most people. -G-
  12. Batteries

    You might pay R16k now, but according to Carl's file on the Naradas (http://powerforum.co.za/applications/core/interface/file/attachment.php?id=781) they'll only last you 1500 cycles at 20% DoD (which is about 2.4-2.5 years if you cycle every day), so after 10 years (which is what companies claim a lithium would last you at 100% DoD), you would have spent R64k in the end. -G-
  13. ZBM2 and affordability

    For an end user, there is no real profit. I've done the math on current batteries for off-grid purposes, and each time I come to the conclusion that in order to be profitable compared to Eskom rates over a period of 40 years (if you keep Eskom hikes and inflation on batteries more or less the same), I'd have to half my average load at night (not even including cloudy days or continuous days of rain) if I was buying a new battery bank every 20 years (assuming it lasts that long). That's why I was looking at the costs of buying a complete 40 year bank up front. With the ZBM2 you can "park" the batteries you don't use for extended periods of time, and replace old ones with the next one as time goes by, and only then will you marginally beat Eskom prices (in my opinion). As far as new tech goes and pricing: If things continue the way its been going for the past 20 years in the country, I'd be very surprised if we see a scenario where batteries will be less expensive than Eskom and also where future battery prices will be less than current battery prices (compared with inflation). My experience is that companies will always try to charge you the maximum reasonable amount for a product, even if that product costs 10 sents to make. So my view is that future batteries will still cost too much for the average consumer unless its subsidized by a government. PS Then again, if the new nuclear deal gets pushed through while we struggle with a junk-status, batteries might actually become a cheaper option than Eskom ... -G-
  14. ZBM2 and affordability

    I was looking over the specs for the Australian ZCell battery packs that are based on the ZBM2 tech, and one thing that I noticed was their claim that the Z Cell (and by extension all their ZBM2 batteries) can be switched off and left on the shelf indefinitely. This got me a thinking. Their last price I saw was quote around $8000 for a 10KWh pack that you can draw at 100% DoD. At current exchange rate we're talking about R110k for 1 pack. So why not buy 4 or 5 or 6 of these if you have the money or can finance it? If you *can* finance that amount, were talking about a R1mil odd repayment capital in total for 4 batteries that will last you 40 odd years (as you just swap out the old battery with a new one every 10 years). Compare that to Eskom increases over 40 years with a modest 6% per year, and you're looking at R1.14mil (if you pay +- R600 per month now for electricity). I guess the biggest hurdle is that big chance you have to take hoping that each battery will start up after 10, 20 or 30 years sitting doing nothing. (Ed: Calculation error on the Eskom side, its R1.14mil over 40 years, not 11mil). -G-
  15. Where is grid tie legal?

    I read yesterday that Tshwane is moving to allow grid with sell back active via their EPG program, soon. -G-
×