Am thinking about the best way to use excess PV to heat the house or at least the water. From basic under-sink electric water heaters, electric hot water taps to electric boilers and now wondering air-source or an auxiliary immersion tank to use excess PV as have a gas combi boiler Ideal Espirit Eco 2 at the moment with no tank. Wasting lots of PV 2/3rds at the moment and then in the winter not enough. I have not purchased to save so much as independence from utilities.
1960s UK, detached house - has new windows, fairly well insulated attic, and has old cavity wall insulation. 3 ppl. Avg use 9 - 14kw electric per day
Q1. Are the air source heat pumps worthwhile? I have been quoted an 8kw
Q2 are they expensive in the winter as i live in the UK my PV was getting just 4kw per day vs 30kw per day now? What sort of cost ratio over the year do they use, i get that now it will rely on my PV and batteries.
Q3 Does anyone have any other ideas on how to heat either the tap water, the heating system or preferably both. I accept I am probably going to have to get a better inverter-charger as the below is not enough for my batteries and the Lux is inflexible compared to Victron, it only charges and discharges when you tell it to as opposed to when batteries needed, nothing like the victron software.
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Main system in East-west 8 x 2 x 370w but looking to change to maybe a quattro 8 or 10kwa as I have possibly the worst system which charges/discharges at set times and lose PV to grid and not on a feed in tarrif so lost solar hybrid coupled growatt 5kw/3.6kw lux
Batteries: mixture of pylontech 3000c x 3, 2 x us3000, 3 x us5000
2nd system (off grid) PV 3.4kw pv 10 x 370w south facing on a pagola with an Easysolar II 48v GX 3Kw 270/50 not completed yet so power in winter unknown.