Plug in solar

Martyn1981

https://forums.moneysavingexpert.com/discussion/comment/81977558#Comment_81977558

you're unlikely to be allowed a 2.8kWp plugin solar PV system,

You've got me thinking now, just a diversion/ponder, but are the MPPT and PV (kWp) limits on the Ecoflow Stream series cumulative? That's to say, if you daisy change several units, can you, in total, also exceed the 2,000Wp limit of the Ultra models (1,500Wp for the Pro), for instance 2kWp into both of two Ultra units, that are linked?

I'm saying linked, so you only have one grid/socket connection, and remain within the 800W feed in limit.

To reduce clipping, you'd probably need ~4kWh of storage per 2kWp of PV, and have the unit discharging 800W, to slow down the point at which the battery is full, and generation is cut to 800W. 8kWh/2kWp would probably eliminate almost all clipping.

Just wondering, as I can read the spec sheets etc, but don't want to simply assume the kWp can be duplicated.

PS Have you noticed that Ecoflow, like other battery suppliers, have delays or stops on battery deployments now. Prices have gone up, and many other issues, thanks to Trump's 'brief excursion' into the Midlle East.

QrizB

You've got me thinking now ... are the MPPT and PV (kWp) limits on the Ecoflow Stream series cumulative?

Ecoflow's own promotional materials seem to agree that they're cumulative. See for example here where it says "up to 4 MPPT x 6 = 12 kW".

To reduce clipping, you'd probably need ~4kWh of storage per 2kWp of PV,

So, 1kWp attached to a 1.92 kW Stream Max/Pro/Ultra, or 2kWp attached to a 3.68kW Ultra X.

Have you noticed that Ecoflow, like other battery suppliers, have delays or stops on battery deployments now.

I get the feeling that European suppliers /distributors have sold all their UK stock and are waiting on deliveries from the Far East.

lohr500

I'm making good progress with my DIY system.
The hard graft was completed today, positioning and ballasting the roof top tub mounts ready for the panels.

Once I get a suitable microinverter, my plan is to test the system at ground level to make sure it all works OK.
Then I'll get the panels up on the roof, attached to the ballast boxes and wired in neatly.

.

flaneurs_lobster

https://forums.moneysavingexpert.com/discussion/comment/81977823#Comment_81977823

Nice view.

QrizB

And a pretty outbuilding!

I'm making good progress with my DIY system.

It's a shame the roof isn't pitched in the opposite direction, it's costing you a few degrees of tilt.

MouldyOldDough

https://forums.moneysavingexpert.com/discussion/comment/81977586#Comment_81977586

The car would probably remain unused all week and remain plugged in - but at the weekend - I would imagine that 100 miles would be likely.

lohr500

https://forums.moneysavingexpert.com/discussion/comment/81977868#Comment_81977868

It is a little frustrating. But at least I can get the panels south facing. The boxes are designed with an 18deg elevation.

I suspect the tubs are designed with a fairly shallow angle to help reduce the forces in strong winds.
And cheaper to produce as they will be able to get away with less material.

There is also a solution called Gram-Box which is water filled and has a 23deg elevation.But each unit is more than twice the price of the Fastensol tubs. Based on the theoretical annual output using the PVGIS tool, the increase in output would only be 10kWh so not a good return on the extra investment.

lohr500

On a related subject, does anyone know how reliable the PVGIS solar calculator is?

If I pin the location where the panels are located, the PVGIS model tells me that the optimal azimuth angle is -16deg from due South.

Most other websites seem to suggest that due South is the best position for the UK.

The modelling doesn't show a great deal of difference in terms of annual output, but I might as well optimise the azimuth angle before fitting the panels.

Are there any other tools that help in calculating the optimal azimuth angle that I could use as a cross check?
Most of the tools bring up a satellite image of the property and assume a fixed position aligned with the roof.

Martyn1981

https://forums.moneysavingexpert.com/discussion/comment/81978072#Comment_81978072

Hi, for me (in Cardiff), it suggets +4d for orientation. I believe the model does take local conditions, including weather into account. Been using it / recommending it for ~15yrs, so I don't think it will steer you (too) wrong.

Newbie_John

There's also a lot of random bits to consider - 30-40° south is best for the total output, but if you don't have battery then you may be better off facing south west at bigger angle to maximize output after 4pm when you're at home/when rates are more expensive with ToU.

90° angle will have lower output in summer (when you may not need that much electricity) but better in spring/autumn etc.

Also few comments earlier it was mentioned that in July they got 1000kWh and in August 1300kWh - very hard to predict weather so long in advance.