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# Typical BER improvement after solar pv install

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#62
Registered Users Posts: 4,840 ✭✭✭

Solar calculated based on DEAP assessment.

Chimney and External insulation as per advice from BER assessor earlier this year - gave the report / Cert and advice on what other improvements would make.

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#63
Subscribers Posts: 41,236 ✭✭✭✭

if the figures are pulled from the result sheet of DEAP, then the 2.08 energy conversion factor will already be factored in.

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#64
Registered Users Posts: 4,840 ✭✭✭

I calculated the solar figure of 25.79 using the (0.80 x KWp x S x Zpv) / m2. So (0.8 x 4 x 1072 x 1) / 133 = 3430.4 / 133 = 25.79.

It was the mention of the conversion factor i was unsure of.

We have to get the BER assessment done in any case and one again post external insulation, i'm just trying to figure out at what point i can potentially move to a green rate mortgage.

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#65
Subscribers Posts: 41,236 ✭✭✭✭

im assuming the 133 is the sq m of the house?

if so the correct calculation to figure out the BER uplift is:

(0.8 x 4 x 1072 x 1) = 3430kWh/yr (this is the delivered energy as per DEAP)

you then multiply this by the primary energy conversion factor of 2.08 (for electricity) to get the total dwelling yearly uplift of 7134.40

divide that by the floor area of 133 to get the "per sq m" BER rate uplift = 53.64 kWh/m2/yr

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#66
Registered Users Posts: 4,840 ✭✭✭

Thanks so much - yes, the house is 133 sq m.

So with the Solar that brings me into B2 and able to go for Green Rate Mortgage - every penny counts these days.

Thanks again Sydthebeat.

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#67
Subscribers Posts: 41,236 ✭✭✭✭

youre welcome

PV is a great way to get significant uplifts to your BER, due to this energy conversion factor.

obviously you need to get your calculations done / checked by your BER assessor in order to be paid the grant / publish the BER cert

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#68
Registered Users Posts: 4,840 ✭✭✭

100% - solar installer back tomorrow to fix a minor issue, and then will hopefully be pulling the trigger on the BER update. Had full BER assessment done in April to baseline where we were at so should be straight forward to do.

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#69
Registered Users Posts: 393 ✭✭

C3 at the moment and getting 15 panel solar PV system put in, hope that at least brings me up to B3 to go for green mortgage

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#70
Registered Users Posts: 1,163 ✭✭✭

Do some other work to make sure, like block up fireplace, replace all bulbs with leds,make sure HW cylinder is lagged, also timer on it,and make sure there is 300mm of attic insulation, this is all stuff you could DIY or would cost very little.

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#71
Moderators, Sports Moderators Posts: 18,805 Mod ✭✭✭✭

There's a fixed formula to tell you your exact improvement, may be back in this thread somewhere

My stuff for sale on Adverts inc. outdoor furniture, roof box and EDDI

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#72
Registered Users Posts: 393 ✭✭

Got all the attics and walls insulated a while back, new triple glazed windows aswell and a stove fireplace

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#73
Registered Users Posts: 1,163 ✭✭✭

have all your documentation handy, BER assessor will not take work into account if it does not have paperwork.

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#74
Subscribers Posts: 41,236 ✭✭✭✭

There are seven item here that every homeowner should prepare with prior to a BER assessment

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#75
Registered Users Posts: 1,814 ✭✭✭

I recently got a 4.4kWp system in. But between the previous BER and the latest one, I got a new composite door, a new Grant Vortex, new boiler/ heating controls, new dhw cylinder, and a wood pellet stove.

My previous BER was C3, and the latest one is a B1.

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#76
Registered Users Posts: 1,419 ✭✭✭

Hey, it's all good (for your pocket and planet earth) to make the house energy efficient. But you can already get a lower mortgage rate than the green mortgage rates (so not based on any BER). Compare mortgages - ccpc.ie consumers shows the cheapest providers. Last time I checked a few months ago, Avant where the cheapest. I know it's a pain to move, but will save from month1. Some of them cover the cost of the legal part.

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#77
Moderators, Education Moderators, Home & Garden Moderators Posts: 8,120 Mod ✭✭✭✭

Indeed. Switched to Avant back in Jan on a seven year fixed rate at 2.05%. Was the cheapest long term fixed by a long shot at the time and but it wasn't a green mortgage (we would have qualified for one anyway). However since then, Avant rates have shot up in line with ECB rises and the same product is now 3.05%.

Best on the market right now as far as I can see is Haven's green mortgage (four year fixed at 2%). Doesn't seem to have a LTV limit either.

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#78
Moderators, Education Moderators, Home & Garden Moderators Posts: 8,120 Mod ✭✭✭✭

Aaaand that ship has now sailed. Haven green mortgage is now 2.5%.

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#79
Registered Users Posts: 1,419 ✭✭✭

Just looked at AIB and seems they only offer the green as a 5 year fixed now, not variable. But might be buried on the site somewhere. Looks like it's 2.10% under 50% LTV, 2.15% 50-80%, 2.25% over 80%. So around 0.25% to 0.30% cheaper depending on LTV than non-green 5 year fixed with them

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#80
Registered Users Posts: 3

Not really clear where Green rate sits from PR or RTÉ coverage..

"As sustainability is a priority for AIB, we continue to offer lower green mortgage fixed rates to customers buying homes with an energy rating of B3 or higher," the bank said in a statement.

We went from C2 to B2 after having 14 no. 380W Hanwha Q cells have generated 105 units to date (about 5/ day) also with 5.2 kW Sofar AMASS battery and Diverter.

D/N noted our usage in past few weeks is averaging 6 units day and same at night had been 4 before 2 no. kids and the added tumble drying, dishwasher and EV charging going up to 10 as day when electric shower was going over summer.

Currently on 4th fixed year of 3% with BoI looking to switch to AIB fixed for 5 years as working on assumption that if we reset in a years time BoI would be lopping the 4+% interest on us - pity they won't countenance our going to their green rates as AIB and PTSB do - also going to contact Switcheroo for Avannt or Haven but it seems the AIB at 2.15% if still available would be the way to go?

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#81
Registered Users Posts: 36

Hi All,

Some great info here. I was easily able to calculate the impact my planned solr will have, but can anyone tell me where I can find what impact the following changes would make ?

1. Upgrade standard oil burner to condensing
2. upgrade house to zoned heating (currently all heated together, no stats, no TRV's) single analog timeclock

Thanks

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#82
Registered Users Posts: 1,996 ✭✭✭

Some good info on SEAI website, above resource might help you. I thought the DEAP software was online to fiddle around with, only seems to be available to registered professionals.

🌦️ 6.7kwp, 45°, SSW, mid-Galway 🌦️

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#83
Subscribers Posts: 41,236 ✭✭✭✭

the "impact" of both of those depends on your starting point.. ie it could lift a F rated to a D rated, but might only lift a B3 to a B1 etc.

solar impact is different because its a stand alone addition of pure mathematical figures.

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#84
Registered Users Posts: 36

Thanks. My last BER was done in 2010 and was a C3

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#85
Registered Users Posts: 190 ✭✭

Have a BER rating of C2 from 2013. Rating should be the same today as there have been no material changes that would impact rating.

Just added up our total kWhs for gas & electricity over the previous year, which would be higher total kWh than typical years and it seems to differ from the BER chart numbers by a factor of 2 (kWh/m2/year). Of course - money & not wasting energy aside - it would be no problem to use twice the kWh each year to match the BER numbers.

I know they do not calculate it this way, but an interesting data point all the same.

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#86
Subscribers Posts: 41,236 ✭✭✭✭

theres no way of calculating the uplift without having access to the original calcuations.

in any effect, the BER cert only lasts for 10 years so the 2010 assessment is out of date

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#87
Subscribers Posts: 41,236 ✭✭✭✭

many things have changed since 2013 which could affect your rating, even if no material changes have happened to the dwelling.

since 2013:

• baths and showers are now included in the assessment
• the electricity conversion factor factor has dropped from 2.42 down to 1.75 currently
• occupancy rates higher depending on the sqm of the building.

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#88
Registered Users Posts: 8,502 ✭✭✭

Ours went from b3 to a2 with 7kwp solar panels added..

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#89
Registered Users Posts: 721 ✭✭✭

Hi All

I was a C1 Mid Terraced house had doors windows Upgraded to Triple Glazed just had Solars installed Mid January and bloody love them 4Kw with Hybrid inverter.

Got my BER today backbone from a C1 to a A3 bloody thrilled Green Mortgage too I'll be going for..

BER guy was great came Wednesday and had it ready today Tuesday only delighted 😀

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#90
Registered Users Posts: 118 ✭✭

We were a retrofitted A3, with heat pump and insulation. Added 6kW and are now at A1.

(The BER lists our C02 emissions as a negative number, which is a bit odd, tbh!)