Domestic Solar PV Quotes 2022 - No PM requests - See Mod note post #1
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Hi Tipping,
What size inverter are you getting with both installations? It should be a 6K inverter to give you the most potential for future upgrades.
The recommendation these days would be to maximise your solar generation capacity. The idea of cutting back on the number of panels to hit a sweet spot for generation/consumption doesn't really hold. For illustration a 4kW peak capacity system will mean that really only in May are you hitting your full requirement, and even then due to the lumpy nature of generation you're likely not to have the energy when you most need it.
As you've discovered, by shopping around you can easily get more panels without having to pay more money and panels have gotten cheap relative to the cost of everything else.
Your E/W 6.4KWp installation will generate based on Europa significantly more energy over the course of the year than a 4KWp and the Energy generation in theory will be belter spread out. ~4700 Units compared to ~ 3700 Units. Is 16 the max panels that will fit on the shed? If you could get that up to 20 panels I'd go with that over 10 panels south facing which probably will have partial shading issues due to window placement. I bet the slope of the shed is more gentle as well? That's another plus factor.
An Eddi doesn't really make sense anymore given the Feed In tariff for excess power. Quote 2 is closer to the money but still somewhat over priced.
Post edited by Manion on1 -
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That's absolutely what you should do then. Max out the south aspect and then go for East or West for the second string of another 10 panels.
You'll get 4529.24 Units for 12 panels south, and another 2727 for 8 panels west. Depending on the inverter and panels you might have a max of 10 panels each string and he should not split a string across aspects. From March till October you would basically generate more than 100% of your electricity needs. Even a small battery in there would smooth out your consumption during a day to ensure solar generated during the day was available at night.
You should be able to get an 8KWp system with a 6K hybrid inverter installed for the money you've been quotes after grant.
Now there's all types of things you can do to get even more power out of your setup and those can be explored with a bit of research but the simplest and cheapest thing to optimize for is the number of panels. Your shed sounds like a house btw ;). A few posters here would have that decked out with panels as well, even south facing wall mounted ones with a second inverter. It sounds like your property is idly suited for being a Solar powerhouse, if you where inclined. If your heating system was a heat pump you'd be laughing.
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I think the zappi can do both.
Grid CT (possibly already has a harvi to do it), is for the grid CT for the whole system, and then you can also have a supply CT to protect the supply cable.
I don't have a zappi, but I do have an eddi, set the CT to monitor, then you can have it monitor a group, and set a group limit
(There is no CT connected to my eddi's second CT port)
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Some Graphs to help. I've two batteries for a total of 10KWhs capacity that can charge up in Parallel though seem to always max out around 50A Dc, 13 AC or approximately 4.4KWh in terms of energy. It really depends on your Inverter and your batteries as well as their configuration as to what can be supported in terms of max charge but you wont be charging your batteries at 32 amps. It takes about 3 hours to go from 10%-90% battery charge with the remaining 10% taking another hour or so.
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