Project Solar - PV and Battery with Social Energy - Mis-sold?

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Hello,
My brother-in-law was talked into having a 3.3kWp solar array with a 3.3kWh Duracell Energy Bank battery (and the promise of a second battery to be installed in April 2020) installed in December 2019 by a Project Solar salesman. As I understand it, the entire thing was funded by a £10,500 loan at 9.9% over 10 years.
They were 'told' (but nothing in writing) that the earnings and savings would more than cover the finance payments and they would break even in around 10 years. So far they have not had a smart meter installed so it would appear that all their exports are not earning them anything. They have also been informed that the second battery is somehow not compatible with Social Energy so cannot be installed. They have been offered a 5.8kWh solax battery to replace the existing Duracell battery.
Apparently they agreed that there would be a 90 day period before the smart meter could be installed where they wouldn't get paid, but the Covid situation has now delayed the smart meter installation indefinitely. However, the Social Energy app seems to be measuring their export (possibly via CT clamps?). Should they be entitled to compensation for the delayed smart meter installation?
I guess they are paying around £135 per month on the loan which I believe is more than they could possibly ever save or earn in even the best month. They will pay over £5,700 in interest over the course of the loan making the total cost over £16000. I cannot see how the system could ever recoup this total outlay.
Given the obvious financial imbalance, is there a claim for mis-selling and how would they go about initiating such a claim?
I've suggested that they complain to the finance company and demand that all interest be waived, with possible escalation to the financial ombudsman in the first instance.
The Duracell batteries seem to be available on Ebay for £2750 each whereas the Solax 5.8kWh battery seems to be available for around £2,400 so I've suggested that they accept the replacement battery only if they also receive the difference of £3100 in compensation. Does that sound reasonable?
Alternatively, as the battery is unlikely to prove cost effective, I've suggested that they request a full refund for the batteries (so £5,500) and just keep the PV array at a cost of £5000. Would that be fair?
Given the high price of the Social Energy tariff, would they be better just switching to Octopus Agile and forgoing the energy trading that Social Energy do, which apparently they will earn from?
Does anyone on here have any experience of claiming compensation for mis-sold solar panels and/or batteries in similar circumstances?
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Project Solar quote - is it a good deal?
What you describe seems to be the norm, they promise that income will cover costs and loans, but the paperwork never says this. The paperwork seems to accurately state generation and in the FiTs days the subsidy and export part, but would never include their verbal promises of covering the cost.
I've no idea if this will help you, but if you search enough I'd suggest you will find me and others railing at perhaps a dozen or more threads that read very similarly to your original post.
Sorry I can't offer anything more substantive, nor promising, but I hope this helps a bit.
For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
Surely there's some legislation that protects people from exploitative finance arrangements?
If I were your BiL, I'd try and cut my losses and so I'd accept the replacement solex battery. I googled what I think is the solex battery (https://zerohomebills.com/product/solax-triple-power-lfp-5-8kwh-hv-solar-battery-storage-w-bmu/) and they're worth £2500 including VAT. I'd then look at getting a better loan, or put it onto a 0% credit card as 9% APR is quite a hefty interest rate these days. That would bring down the monthly payments at least.
I'd then look at getting paid for the electricity I'm exporting by joining Octopus Outgoing:
https://octopus.energy/outgoing/?gclid=EAIaIQobChMIlZKQrO7l6gIVjtd3Ch3qSACNEAAYASAAEgLTl_D_BwE
Solar iBoost+ to two immersion heaters on 350L thermal store.
100% composted food waste
Mini orchard planted and vegetable allotment created.
He also suggested that as they seem to have close links with one or two lenders, it can be argued that by offering a specific bank's finance deal within the PV sale, the bank then becomes party to the whole deal as they are not fully independent - as they would be if the buyer went and found their own finance from a choice of lenders.
For general PV advice please see the PV FAQ thread on the Green & Ethical Board.
Since they gave such an awful name
4kw sse since 2014 and 6.6kw wsw / ene split since 2019
24kwh leaf, 75Kwh Tesla and Lux 3600 with 20Kwh useable storage