Most efficient use of NIBE GSHP with Solar PV

bob grumble · 2022-10-08T13:02:56Z

Hi - hoping you can offer some advice. Have NIBE F1155-12Kw GSHP with 500L water cylinder. GSHP runs whole house heating, underfloor downstairs and radiators upstairs in a new build. Roughly 10,000 Kwhr use. I monitor elec usage for GSHP and over winter 4months it uses >30kwh/day - for rest of year it's <10kwh Planning installing 10kw Solar PV for financial and carbon footprint reasons and will install a diverter to immersion heater. I'm anticipating minimal excess solar power in winter and can probably arrange washer/dryer etc to work within peak solar return even if we do. What i need advice on is how best to optimise the solar output in rest of year. I've been told that scheduling the GSHP is not a good idea as it leads to more start/stop and it's most efficient running full time. On that basis is it as simple as waiting til i turn off the underfloor (or turn on) and at the same time put the GSHP controller to only heat water, if necessary, in the night ? This is scheduling - which i've been told is a bad plan - but on the other hand the pump must go on/off in summer months so not sure I'm making it any less efficient. THe other option is that i schedule the GSHP only to operate during peak daylight hours Interested on what others are doing in this situation ? by the way - i am in awe of the NIBE GSHP !......

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Ground Source Heat Pump (GSHPs)

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Benguela

(@benguela)

Trusted Member Member

Joined: 3 years ago

Posts: 29

18/11/2022 12:18 pm

Hi @derek-m

Thanks!

I totally understand about the battery (and the VAT side of things). It's just that I've got a SolarEdge single phase inverter and that system wants a high voltage DC coupled battery and there are only two that are compatible: LG Chem Resu Prime, or a SolarEdge StorEdge. I just don't have the money right now (about 5-6k for the LG, about 7-8k for the StorEdge).

In fairness, I could install any old AC coupled system. But that means I'll have to buy another inverter on top of the SolarEdge inverter I've already got. I know it's possible. And maybe it's cheaper and will work equally well. It's just not very elegant, so I'm biding my time, looking at all the things I can do, and then deciding.

Out of everything, the cheapest, simplest thing to do is to get an iBoost.

👍

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Derek M

(@derek-m)

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Joined: 5 years ago

Posts: 4425

18/11/2022 1:23 pm

@windyinsancreed

We have a 4kW solar PV system which provides almost all our hot water from Spring through to Autumn. Even on cloudy days it can supply sufficient heat energy.

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