AHSP DIY?

[fiaraziqbal]

bit of a mad one.  I am sat in the  outer hebrides with a wind turbine and battery system that i built and surpsisingly it works really well!(accept the last few days wher we have had no wind and lots of sun.

 

As i am getting a cabn ready for winter i have given thought to heating and with th eelectricity i have generated i was giving thoght to an AHSP.  BUT.. oh what if i install one myself??? now that would be neat!  has anyone given this a go?

[Conor]

Quite a few here have. Monobloc ashp and a pre-plumbed cylinder is simple enough. 

 

 

I say this with a ashp on order, not having really looked in to this yet...

[ProDave]

No problem DIY installing an ASHP.

 

I have more concern how you will power it if completely off grid?  They will expect a 230V ac 50Hz supply and even a small 5kW ASHP will need perhaps up to 3kW of ac power.

 

If it is just a small cabin (one room?) then one of the smaller air to air heat / cool units might be easier and you can get those in lower power ratings.

 

Tell us more about your supply? on grid / off grid etc.

[fiaraziqbal]

1 hour ago, Conor said:

Quite a few here have. Monobloc ashp and a pre-plumbed cylinder is simple enough. 

 

 

I say this with a ashp on order, not having really looked in to this yet...

thanks, i have just had teh idea and had a quick look at the methodology but thats about it. 

[fiaraziqbal]

1 hour ago, ProDave said:

No problem DIY installing an ASHP.

 

I have more concern how you will power it if completely off grid?  They will expect a 230V ac 50Hz supply and even a small 5kW ASHP will need perhaps up to 3kW of ac power.

 

If it is just a small cabin (one room?) then one of the smaller air to air heat / cool units might be easier and you can get those in lower power ratings.

 

Tell us more about your supply? on grid / off grid etc.

i was looking at the small air to air heaters, my current systm (offgrid) is a solr wind hybrid but as a prototype i only have a max of 1.5kw output with a 10kwh battery pack. i was giving thought to 3kw widn turbine but thats just a pipe dream at the moment as its a bigger cost, install basically everything.  The cabin has 3 rooms but i have never used one of teh small air to air heaters so i am a littel hesitant.  Are t hey any good?

[fiaraziqbal]

12 minutes ago, fiaraziqbal said:

thanks, i have just had teh idea and had a quick look at the methodology but thats about it. 

do you have any links to those who have set them up as i couldnt find any using teh search function?

 

[ProDave]

One of the small air to air units that do heating and cooling would do, you can get them with one outdoor unit and 1, 2 or 3 indoor units so can do up to 3 rooms.

 

The grey area is the pipework is refrigerant gas, they come pre gassed but you really should get an F gas engineer to make the connections and leak test etc before opening the valves.

 

The beauty of small air to water heat pumps is the refrigerant gas is all pre plumbed within the unit so only water plumbing and wiring to do.

[SteamyTea]

12 hours ago, ProDave said:

They will expect a 230V ac 50Hz supply and even a small 5kW ASHP will need perhaps up to 3kW of ac power.

And quite possibly a pure sinewave, so a more expensive inverter.

 

11 hours ago, fiaraziqbal said:

i was giving thought to 3kw widn turbine

Like a PV system, a wind turbine will only give the rated output when the conditions are right i.e. 800W, direct beam for solar, 20 m/s windspeed for a turbine (or whatever the production curve is).  This is why battery storage is used, it can soak up all the smaller generation packets and store them for later.  So a larger battery would be needed ideally.

It eventually get to the point where thermal storage becomes cheaper i.e. in water, and then just pump that about.

[fiaraziqbal]

On 28/07/2021 at 08:02, SteamyTea said:

And quite possibly a pure sinewave, so a more expensive inverter.

 

Like a PV system, a wind turbine will only give the rated output when the conditions are right i.e. 800W, direct beam for solar, 20 m/s windspeed for a turbine (or whatever the production curve is).  This is why battery storage is used, it can soak up all the smaller generation packets and store them for later.  So a larger battery would be needed ideally.

It eventually get to the point where thermal storage becomes cheaper i.e. in water, and then just pump that about.

I have a pure sine wave inverter wich def was expensive, i have built my first battery based on 18650's off the top of my head i think its 350 Amp hours at 24 volts.  Its just not been windy the last week on teh isle of lewsi!!!!

[SteamyTea]

2 hours ago, fiaraziqbal said:

Its just not been windy the last week on teh isle of lewsi!!!!

It is heading your way now, should have pasted me by morning.  What a difference from last week.

[ProDave]

2 hours ago, fiaraziqbal said:

just not been windy the last week on teh isle of lewsi!!!!

So your solar PV is charging the battery instead?

[fiaraziqbal]

On 29/07/2021 at 22:18, ProDave said:

So your solar PV is charging the battery instead?

yes.... but i should be gettinh hold of another charge controller and i am going to try and "double up" so i reckon blown BMS and no power!

 

[fiaraziqbal]

On 29/07/2021 at 22:15, SteamyTea said:

It is heading your way now, should have pasted me by morning.  What a difference from last week.

havnt had anything really bad, still just a tickle from the wind

 

[Triassic]

Do you have a stream? Maybe a diy water turbine would be a better option.

 

Might be worth looking at this guys off grid blog https://lifeattheendoftheroad.wordpress.com/category/hydro/