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PeterP last won the day on September 17 2020

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  1. AUX is Smart Load (output) or Generator/turbine (input) or Microinverter (input) depending on what you chose to use it for. UPS is your Load output (essential loads) = Loads that will operate when grid is down.The House is your non-essential loads (ie loads that will not function when grid is down). The cup with a straw through it indicates you have a CT clamp connected to prevent feed-in. The Pylon Tower is the Grid. Your installer should have given you a manual or a rundown of the basics.
  2. You can increase the SOC % set in System Mode - then the grid will supplement once it has discharged to that SOC %.
  3. The Solar MD 3.7kWh is a little more than your budget, but it has 100A fuse so it virtually matches the 5K Sunsynk as it can do 1.3C. It does require the Solar MD Logger as well though.
  4. From Sunsynk: In time of use set power= essential load, so at night only that much power it will discharge from battery and remaining from Grid , At day time solar will provide both essential and non essential, You need to to Click on zero export only not Zero export to load, Else solar won't provide supply to non essential If solar is less then battery will provide supply to non essential till it will reach SOC, you can control this by Setting % in time of use , suppose you have set 95% then battery will discharge only 100-95% at day time and if you set 20% for night then battery will discharge to 20% in night. So the Sunsynk will supply battery power to non-essentials.
  5. If you limit the battery discharge power in System Mode surely this is supposed to limit battery discharge to essential loads only? As I understand it, non-essential loads are not supposed to get power from anything but grid and excess PV, having said that we have one site doing just that (battery power to non-essential loads) and we've been told it will be fixed with a firmware upgrade. I sense there is a lot of confusion around this, and I, for one, am not sure how it is intended to work as we've seen both....
  6. 1) I don't see the reason to switch anything to gas unless that is your absolute favored way of cooking or you want to have redundancy solution in case your PV trips out. Heating anything, but especially water with gas is more expensive than solar or solar PV will ever be + it's polluting + potentially a fire/explosion hazard + you have to replace cylinders when they run out + gas will go up in price over life of your PV system. Rather get a little more PV and storage and some energy efficient appliances. 2) Parasitic loads can make up a large portion of our night time loads eating away at the battery capacity. Switch off and unplug everything that is not absolutely essential and you'll be astounded how much you can save. Even 300W over 10 hours x 30 days adds up to 90kWh over a month. I have wired TV, amplifier etc etc so that I can switch it off on the wall when we go to bed - just get rid of all those little red standby lights and you will save 100-300W easy. 3) Water heating - get a bigger tank and low-flo shower heads and use your PV to heat it up. Some days there won't be enough sun, that's when Eskom will have to step in.
  7. Tariq, wouldn't it be simpler to just leave geyser on non-essential, then you wouldn't have to manage cloudy days and the only downside would be that geyser would not be powered during loadshedding? If loadshedding frequency increases then I can see merit with the Smart Load functionality (for geyser) but if it's one or max two outings a day then geyser should still work.
  8. Ditto - we will only ask for final 30% once job is complete which includes COC and any registration docs. Trust goes both ways.
  9. You are currently making good return and your system will have a very high IRR, but it seems you are exporting more than what the CoCT SSEG system allows for (ie you are not currently a net consumer). Net consumer is calculated on annual consumption and production so you might still be ok once winter is taken into consideration, but seeing your impressive tracker results, I'm not sure You are missing my point about having the option to add batteries, of course it will be more expensive and thus IRR will be potentially reduced but batteries are all about having power when Eskom can't supply - for most people (not you), eliminating loadshedding, is as important as the ROI. On a small residential system the Hybrid inverter may add R10K up-front, but then you are at least able to add batteries at a later point if the feed-in tariff is reduced (or eliminated) - or loadshedding ramps up even more. One of the main problems with CoCT SSEG feed-in system is that you are effectively entering into a 1 year contract with the City on your 20-25 year solar investment. The monthly SSEG connection fee, tariff and feed-in tariff are changed annually which means your system IRR is very vulnerable, especially if it is dependent on the feed-in, to achieve savings (eg. City may only offer R0.33/kWh feed-in next year or R0.10/kWh or none at all.....). The R0.25/kWh incentive is for first year only and may not even apply to systems added in future years. If CoCT would offer a feed-in deal fixed for 5 years then we'd be able to do our sums and make much more informed decisions. With a self-consumption battery system you will fix your R/kWh rate for life of system (currently R1 - R1.50/kWh) so it's a bit easier to work out the IRR as the Eskom kWh tariff historically has only ever gone up. Feed-in tariffs world-wide have mostly been coming down. Currently, hybrid battery system in Cape Town expected pay-back is 5-8 years, grid-tie SSEG can be as low as 3-4 years (but no grid - no worky).
  10. The Hybrid will still require a battery to function during grid-outage - panels will give no power. The reason to start with Hybrid is to give you the option to add battery later instead of having to buy a new inverter once you decide to do so. The Hybrid will export and work while grid is up like Erastus system at a fractionally higher upfront cost but with the added benefit you can add battery at any time (which anyone with a grid-tie only system would ultimately love to have when there is loadshedding...)
  11. Grid Tied Inverter - which has to switch off when grid is down. I like your example, but would recommend setting up with a Hybrid inverter if the feed-in is attractive in your area as this can be expanded to work when grid is down (only requires battery). Most people going solar, do so to be loadshedding proof - I offer the grid-tie version but once it's clear it has to switch off when grid is down it's mostly a non-starter
  12. Current SA EV prices are ludicrous - we got ours 2nd hand for R193K with 35K on clock - so then it's ok. Future EV pricing will be in line with ICE in a few years. We had to replace the other car anyway, so for us it made sense.
  13. ROI is typically the single most important factor when considering going solar - even though being Loadshedding resilient and producing clean energy are close seconds and thirds. The screenshot gives our savings on a 5.6kWp (320W modules) - 10KVA (Axpert inverters) - 13.5kWh (Solar MD Li-Ion Battery) for the past 3.5 years. Cost of system R200K. Annual solar savings: R25K+ What it doesn't show, is that we have further estimated savings of R25,000-R30,000 per year in avoided petrol purchases and vehicle maintenance as the system is also powering our Nissan Leaf EV. We use the electric vehicle for school runs, daily shopping and the odd meetings/outings and are able to have it on the solar powered plug for 3-4hours per day. Standalone the solar system will pay for itself in 6-8 years but adding the car doubled the ROI of the solar system.
  14. The CoCT Residential SSEG tariff shown is only for customers who feed-in - if you are not feeding in, you pay the same Energy Charge but a reduced Service charge of R171 VAT incl. pm. on Home User Tariff.
  15. The 25% limit is about how much the grid has to pick up when it reconnects after a grid-outage. The grid is designed to handle a % of possible loads off your standard supply - now add feed-in, and if left unregulated, you could have feed-in off over 100% plus your loads exceeding capacity of grid very quickly when grid is restored and everyone's load and feed-back resumes simultaneously. If your embedded generator trips it not really a problem (no worse than switching on 2 geysers at the same time) as it's inconceivable that all other embedded generators (geysers on) trip at the same time - when a grid is restored after an outage, it all happens at the same time.
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