I must admit, I've been reading the headline and not the details and just like in the VFD you linked, it says "single to 3 phase" in the headline but "Input:220VAC(+/-5%) 1 or 3phase(for single-phase input, just connect the input wire to the R and S terminals) .Output:3phase 220v. Frequency:0-50hz/60hz. 0-400hz" In the details.
I said something earlier about "why would I buy a VS pump + VFD if I can buy a SSP + VFD and achieve the same outcome for considerably less $?". Well, talking to my electrician yesterday, he wasn't very keen on installing a VFD for my 3 phase single speed pump because "the pump wasn't designed to be run at slower speeds". I initially dismissed this (in my head) as some of you guys have been doing this for years but then I read that VS pumps are built differently, with permanent magnet motors. Hmm, so maybe just reducing the power has drawbacks? Why would they design a completely new motor if all they had to do was add a box of tricks that reduced the power?
So I'm a little stuck now, I want to add a VFD but need to convince my electrician that it is safe to do for a single speed pump. Anyone got anything I can point him at apart from "well, it's working for me". No offence to those people, it may be working fine for years but it may also be slowly killing your pumps, just as an example.
Not related but I decided to add up how many hours I run my pump a year and came to an interesting conclusion. It's 8 years now since finding this site and I've got the chemistry ticking along nicely without any unexpected algae outbreaks. I run my pump 4 hours at night during the summer months, 3 during spring and fall, 2 in the cooler months and 1 during winter (no need to close the pool in winter, haven't seen snow here for decades) and it's been just fine. That adds up to roughly 1000 hours a year. Add on 52 for vacuuming an hour a week and 48 for backwashing and occasional running when the pool is full of kids and I get 1100 hours a year.
The pump pulls roughly 900 watts according to my monitor, (I also recorded 20Kw when running for 24 hours so that also ties up) so that's 1000 kw/h and at a cheap rate of 11.11 cents an hour my bill is €110 + 10% vat = €121 a year.
A VS pump would double the number of hours running and halve the cost (based on estimates I've seen here) so a saving of €60 euros a year. If I saw a 75% saving that would be €90 a year.
This would still make adding a VFD a viable option as I can see I would get that money back in a few years but upgrading to a VS pump (without a SWCG), can't see the financial benefit there. If I went down the road of SWCG and ran the pump 12/24 hours a day, sure, I can see how that would work but for me and how I've been managing my pool, I don't need to run my pump that much.
Anything I've got glaringly wrong there?