Its entirely your decision regarding batteries and water diverter /eddi install.Contemplating getting solar panels for 4 bed detached house 206 degree SW direction from front window.Is it possible get panels for electricity and sell over flow back to grid Smart meter being fitted shortly My estimated yearly usage is around 3500 kw . It seems any providers I made queries with want to put in batteries , and water heaters etc . Just want to use electricity generated and sell on excess and get payment off bill at the end of payment period. Have gas in the home turn on for an hour for water Some advice would be appreciated
I would recommend getting a hot water diverter. It’s free hot water as Fidel said from April to Oct.
Agreed. But having the ch on just to heat water from April to Oct is surely not very efficientI think the economics of the eddi vs gas are marginal. €500 to purchase + install. That's alot of surplus kWh to be generated before system inefficiencies; Tank capacity, destratification pump, if your central heating system heats the water tank while CH is on etc.
I've never heard that one before - surely most systems don't require CH to be running to heat HW?Agreed. But having the ch on just to heat water from April to Oct is surely not very efficient
I never turn mine I just for water but if it’s on for heating absolutely it’s on for water also
Using the boiler won't be as efficient as electricity which is close to 100% efficient, but the price differential means using the boiler will be significantly cheaper.Agreed. But having the ch on just to heat water from April to Oct is surely not very efficient
I presume they mean running the central heating boiler to just heat the water. Most modern central heating installs will include a separate circuit for the water.I've never heard that one before - surely most systems don't require CH to be running to heat HW?
That’s it exactly. Sorry if I wasn’t clearI presume they mean running the central heating boiler to just heat the water. Most modern central heating installs will include a separate circuit for the water.
Indeed, but note the Eddi is useful for Apr-Oct use, when its unlikely will have boiler on for space heating reasons, running a 24kW boiler to heat a cylinder of water indirectly is wasteful, if that is your setup. Different if your boiler provides hot water without heating a cylinder of course.I think the economics of the eddi vs gas are marginal. €500 to purchase + install. That's alot of surplus kWh to be generated before system inefficiencies; Tank capacity, destratification pump, if your central heating system heats the water tank while CH is on etc.
Hi Leo, I appreciate your thoughts on this.Using the boiler won't be as efficient as electricity which is close to 100% efficient, but the price differential means using the boiler will be significantly cheaper.
Hard to know for sure, losses in the pippework will very depending on whether it's insulated, in contact with other conducting materials, etc.. Given costs for electricity per KWh of energy delivered is about 3 times that for gas, you could lose most of the heat and still have it work out cheaper to use the boiler.but what is an estimate of the indirect heating efficiency, at cylinder, with c.40m of piping (supply and return)?
Just FYI you don't necessarily need to have a larger/second inverter. It is not uncommon to over-size solar arrays to the size of the inverter, the inverter will simply 'clip' any power generated in excess of its capacity. Realistically in Ireland you only get peak production from your panels for a few hours a year, for all the rest of the time the inverter is underutilised.We put 8 panels in and now want to put in more but need a larger inverter to add to our system. Otherwise it’s a whole separate 2nd system install
Wasteful how exactly? A modern heated hot water cylinder will have only a small thermal loss and thus be a store of energy, like a battery.Indeed, but note the Eddi is useful for Apr-Oct use, when its unlikely will have boiler on for space heating reasons, running a 24kW boiler to heat a cylinder of water indirectly is wasteful, if that is your setup. Different if your boiler provides hot water without heating a cylinder of course.
I don't think anyone is "moaning", neither do we import Russian, Qatari or Saudi natural gas.Economics perhaps, but weaning ourselves off Putin, Qatar, Al Saud et al is one input to my reasoning, but if that isnt on yours carry on as normal, dont moan about their influence of their power over your life..
Prior to PV Eddi, we would have a DHW zoned water heating requirement for c.1hr each day during summer. (4 adults).
24kW boiler, =>24kWh energy @0.1E/kWh = 2.40 euro per day (includes 26% discount, 2023 prices)..
Eddi instal, if 500Euro, => 500E/2.4E= 208days , =>c. 2 seasons of sole usage.
Thanks for that. Very useful. Il look up the specs of what I have exactly and get back to my supplier. They may not want to oversized but if it can be done then why not.Just FYI you don't necessarily need to have a larger/second inverter. It is not uncommon to over-size solar arrays to the size of the inverter, the inverter will simply 'clip' any power generated in excess of its capacity. Realistically in Ireland you only get peak production from your panels for a few hours a year, for all the rest of the time the inverter is underutilised.
Oversizing solar inverters - is it a good idea?
Learn about inverter oversizing and how it can impact your solar yields, and reduce your energy costs too!If you’ve been in the market for solar, you’ve prob...www.youtube.com
Hi ItchyWasteful how exactly? A modern heated hot water cylinder will have only a small thermal loss and thus be a store of energy, like a battery.
I don't think anyone is "moaning", neither do we import Russian, Qatari or Saudi natural gas.
Not quite. 500/0.1 = 5000 kWh. 2 seasons implies that your 8 panel set up is producing a surplus of 5000/2 = 2500 kWh per year?
The eddi uses SURPLUS electricity after your domestic needs. My 8 panel set up produces a SURPLUS of 1200 units per year, for example. Also, the price of a kWh sold back to the grid is ~0.2c. The cost of gas is ~0.1c. If your boiler is 50% efficient, you breakeven.
I have 18 panels, so its not a problem to have 2500kWh excess/annum, produce consistently 20 to 30kWh and close to 40kWh elec per day Apr to Oct.
Aditionally Elec Irelan paid me 190Euro (0.21/kWh) for c.900kWh of export, even taking into account priority is - house, battery, then eddi ,and then export. .
Interesting data there but I wonder how accurate is your calc especially with the ability of gas boiler to modulate down their output depending, so while the gas boiler was 'on' for 1 hour a day, what is burning gas at full tilt for the hour?The cyclinder perhaps, but how much X kWh of gas do you consume to heat 1 cylinder full. From my experience, 1hr heating/day in summer for a zoned system, I would not consider excessive for 4 adults. => 24kW boiler =24kWh*0.1E=2.40E/day
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