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Marvin

Entry posted by Marvin

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Running all 4 in the winter is quite interesting:

 

PV generation:

About a week with overcast skies and then a couple of days of sun.

 

January is supposed to be the low point for PV generation. Based on the EU calculator we should produce about 180kWh in January. We measured 195 which is about 6.3kWh a day on average. However generation happened spasmodically along with the weather.  For example 14kWh on a good day and 0.86kWh on a poor day.

 

EV

Having the electric car meant that on the few days in the month when the PV generation was over 2kW we charged the car. We use a 3kWh plug in charger.

 

Even with a 5.12kW system on the roof at peak generation during January we only saw a top of about 3kW, so rather than waste (send to the grid) maybe a kW or two we charge the car when  generating  2kW or more and reduce the overall cost of charging the car. We calculate that over a ten year period that 1kWh used will have cost us about 10p.

 

Hot water:

Most of the excess was captured in the hot water tank using the Solic 200 controller and a 1kW twenty seven inch immersion. Twice even reaching over 60C resetting the countdown timer designed to warn us when the tank has not been over 60C for more than 10 days.

 

MVHR

The MVHR is now running smoothly with all controls working. One of the interesting items is the water coils that have been installed in the air ducts. These have increased the inlet air temperature from 17C up to 25C depending on the heating water set temperature and flow rate through the coils. Quite nice to have warmer air into the rooms in winter. Can't wait to use them in summer when cooling the bungalow using the ASHP and powering the ASHP using the PV.

 

ASHP:

ASHP kWh use over January roughly 9kWh a day for 100m2 for average 20 C over 24 hours indoor temperature. 

 

Had to move the ambient temperature sensor on the ASHP the other day because it was exposed to direct sunlight and effecting the temperature compensating mode. 

 

If it wasn't for Build Hub and the helpful contributors I would have struggled with half of this.....  Thanks to everyone on here who helps.

 

Many people who are new to the idea of ASHPs will find this a good place to start.

 

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Good luck with your project.

 

M

 

 

 

 

 

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SteamyTea

"

Hot water:

Most of the excess was captured in the hot water tank using the Solic 200 controller and a 1kW twenty seven inch immersion. Twice even reaching over 60C resetting the countdown timer designed to warn us when the tank has not been over 60C for more than 10 days."

 

I take it that is just for a legionella cycle?

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Marvin
2 hours ago, SteamyTea said:

I take it that is just for a legionella cycle?

Yes. Glad to see my technical writing skills have improved..... 

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SteamyTea
3 minutes ago, Marvin said:

Yes. Glad to see my technical writing skills have improved..... 

Works for me.

 

Interesting this legionella cycle.

If you are heating with an electrical element, any water that touches it is going to be zapped to about 200°C for a few seconds.  I wonder if that is enough without having to do a separate cycles every now and again.

Different scenario if using a coil of a heat pump, but probably fine with a higher temperature gas or oil system.

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