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Delta9

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  1. Not sure if any of you here have seen this program or not? https://www.suncalc.org/#/-29.8438,23.2046,3/2020.12.04/10:52/1/1 Its very very useful to see where the sun is on your property for a given day/month of the year.
  2. Thats a point. I have lightning arrestors on in my DB board for incoming power from grid including neutral. Not sure how effective these are. Does earth need to be considered here?
  3. Correct me if I am wrong...... The array is acting as an "antenna" of sorts. It is up high on the roof facing the sky. A nearby strike generates a "pulse" and is carried through conductors to electronic equipment. That is enough to blow the equipment. It happened to me the other night. My satellite modem is connected by thick RG11 cables out to a large satellite dish. I turned the power to the modem off but left the ethernet cable from the LAN port of the modem to the router connected. We had what must have been a very close by strike. As soon as the flash lit up the room the
  4. Well another night another storm rolled on through. Got woken up a bit after 1.15am to the sound of heavy rain and thunder. The lightning was some distance off this time and not directly over us like the other night. Still getting some good flashes and loud cracks but they were a good 5 or 6 seconds behind the flash of lightning so some distance off. So this storm was not going to damage anything but it proves the point. A storm can roll in anytime of night and do some serious damage from lightning. Other then the hassle of turning the solar array off early evening and back on again
  5. OK ....so I am probably over thinking this but something like this would be a good setup to have benedict.at/files/documents/4525177-D879E-161.pdf Its a DC contactor. Have that controlled by a timer and the PV array can be disconnected every evening and reconnected every morning with no intervention other then an emergency stop for storms during the day. Take it up a level..... have the contactor controlled by a lightning strike meter (cant remember what they are called but they detect lightning strikes at various distances) so that when the strike detector detects lightning wit
  6. So earth the panels (strings) and get insurance. Then pray. Hmmm sounds like a plan. Any thoughts on taking the fuses out of the line between panels and charge controller to act as a physical air break - nothing lost if this is done at the end of the day and put back early bells in the morning. That way if (when) a nasty storm rolls in over night any potential surge from a nearby strike is contained. Strangely I also lost 2 light globes in the event 2 nights ago. A compact fluorescent and a new led bulb - both in or near the kitchen area. Odd. I was worried my inverter might hav
  7. Hi Forum, How big is the risk of a lightning strike to a solar panel array? How do you mitigate against it? People on the Highveld must have considered this when putting up an array given the amount of lightning that goes on there. If the panels take a hit what sort of damage will occur? Will this surge of energy go through the whole system and take out inverters and even worse, electrical appliances connected to the inverter? Would a DC coupled system be safer in this respect as the surge would have to go through a battery bank before it can hit the inverter. Will a large elec
  8. They always find out...sooner or later. Then its rations for the longest time.
  9. With AC Coupling would it be fair to say that if you want to be able to run connected to the grid but also be able to use solar to power the AC loads but with the twist (and its a BIG twist to the story) that because the local grid is not that robust and suffers from loads of load shedding, that to be able to do this from inverters successfully one needs a big battery connected to the inverters simply to be able to technically power those AC loads when the grid is down? Not to be able to power those large AC loads from battery when the grid is down but because the inverters provide the sine wa
  10. This explains a bit about what inrush current is https://www.facebook.com/2082031392023647/videos/2341453072570941
  11. Does anyone know how many cells there are in a Freedom Won battery - 48v ? I believe they use Sinopoly prismatic cells - are they 15s or 16s ?
  12. The question is, why do you have a 3 phase pump in the first place? Is the motor size such that you only have a 3 phase option? What size is the 3 phase motor of the pump? You have to allow for inrush current to start the pump. So how many amps does the pump draw in normal running mode? Once you know that, you can then approximate the start up current draw to then work out how much inverter you need to start that load. A soft starter is your friend.
  13. My main concern was the frames expanding and contracting in the sun (heat). Would it be a different scenario re the heating up issue with bi-facials ? (that is, the panels retaining too much heat because they are joined together....not the expanding and contracting issue which I would imagine would be the same with any panel)
  14. Is it doable to join solar panels together with a sealant on thier edges so that rain does not get through to the underside? Thinking of a carport style installation where a car or other things are under the solar panels. So the solar panels become a roof. A few drips here and there is fine but would not want an actual air gap between the frames of the panels. I dont know if using a sealant to join the panels together is something that can be done or not. I know lots you here have installed PV so what are your thoughts on this? How would one achieve a carport with not too much w
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