solar pv quote

EricMears

asturdy2 wrote: »

only problem is the cheapest company for lg's will only put 12 on, the other company which will bend the reg's to get 14 on want nearly 7 grand for 12 !

The 'other company' probably aren't "bending" the regs - they'll be using uprated fixings as suggested by the regs. That will of course cost more than 'ordinary spec fixings' - though perhaps not as much extra as they want to charge. I'd go back to the 'surveyor' who was intending to leave a large gap and ask him/her to requote with fixings that meet your requirements.

asturdy2

EricMears wrote: »

The 'other company' probably aren't "bending" the regs - they'll be using uprated fixings as suggested by the regs. That will of course cost more than 'ordinary spec fixings' - though perhaps not as much extra as they want to charge. I'd go back to the 'surveyor' who was intending to leave a large gap and ask him/her to requote with fixings that meet your requirements.

yes they are using uprated fixings, there price of £5731 for 14 mono black 260w kioto panels is great but when you ask for other panels then the price shoots up. One thing I have noticed so far is that most installers have deals with 1 manufacturer and wil push you towards their panels. All 3 who have quoted me have done this, when you ask for anything else i.e sunpowers, benq's ect then the price increase isn't worth it.

asturdy2

asturdy2 wrote: »

heres the pic of the roof about 9.30am, second guy just been, says we could get 2 rows of 7 panels leaving a 25cm gap, going to quote for micro inverters aswell but says we could put 4 panels on 1 string near chimney and rest on another so we can compare quotes. He is going to quote for 12 327w sunpower panels but says they are expensive.

I got a quote with micro inverters incase I can't move the chimney for £6600. What I don't understand is the surveyor has put a shading factor of 0.9 on the quote bringing the estimated generation down from 3057kwh to 2751kwh. Is he just being conservative with the estimated output ? The roof only shades early morning and would only effect 2 panels, I thought micro inverters would help with the shading ?

Martyn1981

asturdy2 wrote: »

I got a quote with micro inverters incase I can't move the chimney for £6600. What I don't understand is the surveyor has put a shading factor of 0.9 on the quote bringing the estimated generation down from 3057kwh to 2751kwh. Is he just being conservative with the estimated output ? The roof only shades early morning and would only effect 2 panels, I thought micro inverters would help with the shading ?

I'm with you, the use of micro's or PO's should limit the effect of the shading to just 2 or 3 panels. As the shading will only be for a few hours, and when the sun isn't well aligned, I'd have thought the effect would be mostly mitigated.

That reduction of 300kWh (10%) would probably represent all generation during that period!

Perhaps the installer has to cover his/her back, as shading shouldn't be belittled and they don't want to worry about any future complaints - so are quoting low.

TBH, a dual MPPT inverter limiting losses to the RHS panels is probably your simplest and cheapest bet, if you can't reposition that chimney slightly. Micro's/PO's will work a bit better, but at slightly more expense, and more kit that could possibly go wrong in the long term, with access issues.

Start with KISS:
1. Move chimney.
2. Dual MPPT with minimum number of panels on the RHS string.
3. Micro's/PO's.

Mart.

asturdy2

second company are now looking into moving the flue so hopefully I won't need power optimisers or micro inverters.

asturdy2

asturdy2 wrote: »

I got a quote with micro inverters incase I can't move the chimney for £6600. What I don't understand is the surveyor has put a shading factor of 0.9 on the quote bringing the estimated generation down from 3057kwh to 2751kwh. Is he just being conservative with the estimated output ? The roof only shades early morning and would only effect 2 panels, I thought micro inverters would help with the shading ?

finally decided, im goin with installer 2 who is going to move the flue aswell. £5700 for 14 260w panels and £250 to move the flue.

travellerboy

asturdy2 wrote: »

............................................... and £250 to move the flue.

A simpler answer to your vent pipe problem is too cut it below the eave and fit an Air Admittance valve costing about £25. That will satisfy any Building Control dept. and is the cheapest and easiest solution.

ed110220

travellerboy wrote: »

A simpler answer to your vent pipe problem is too cut it below the eave and fit an Air Admittance valve costing about £25. That will satisfy any Building Control dept. and is the cheapest and easiest solution.

But surely that is a flue for a boiler or some other fire etc, not a sewer vent in the photo? You cannot put an AAV on a flue as far as I'm aware.

Ed

asturdy2

ed110220 wrote: »

But surely that is a flue for a boiler or some other fire etc, not a sewer vent in the photo? You cannot put an AAV on a flue as far as I'm aware.

Ed

your correct, it is for a gas fire.

tunnel

Have you had the install yet asturdy2?