3 phase generator......

[frank horton]

just compareing cost etc between a 3phase rotary inverter 11kw x £2,500 or 7kw at £1,500 ish.....plus taxes n delivery from Ireland....
or a used Diesel powered genny......guessing it'll run for prob less than 10 hours p/week..every other week.....it's just a hobby shop.....
advice,
the biggest 3 phase motor is 5HP....most of the time I'll b useing single phase but for the bigger machines I'll need 3ph.....
what size genny with a good saftey margin....?

to upgrade the house supply, 5 years ago was 12,000euros....thats for the new meter and 10m of cable from the pole and thats with 3phase up there.....so thats a non starter.....
this year or next, the plan is to install 7kw solar panels and go semi off grid until we can afford to up the panels and get enough batteries....

so look....
I'm a very active 76 year old and/but who knows how long I have left......

to get a rotary inverter is as above £2,500 plus I believe I'll need some big solar gear / inverter etc to go from solar to 3 phase.....
so with all the above /cost's info seriously looking at a simple genny.....
plus when I'm gone she can sell it on with all the tools easily.....
Lastly
what is the kinda age where the genny's went to electronic control as I want something repairable.....prefer non electronic.....
Not like my Honda genny thats electronic and beyond eco repairs....
many thanks

 

[MetalMonkey]

You could always build a RPC.

Depending on your electrical skill, there is plenty of information out there, they are not particularly complicated.
Especially if you can source something like a 10hp motor locally for cheap - which you often can as they are too big for most people.

 

[fizzy]

LIFPO4 batteries. Solar and or grid connected. A big inverter charger. Around £1500 for the charger/inverter and £2000 for the batteries will give you about 28kw/h of storage.
Works fine if you have cheap electric rates at certain times of day. LIFEPO4 batteries can be had in 24v 200amp/h for about £350. You would need 6 of them running at 48v. In the UK I wouldn't even bother with solar. Just a cheap offpeak tariff. With the worsening state of electricity grids it provides vital whole house backup as well.
In Crete - if you have the land - solar makes perfect sense. Decent 400w panels can now be bought for around £60 each

 

[chunkytfg]

\Could you not run it from a VFD?

an 11kw VFD from RS UK is £700

RS PRO Inverter Drive, 11 kW, 3 Phase, 380 → 480 V ac, 26.4 A | RS

uk.rs-online.com

 

[fizzy]

\Could you not run it from a VFD?

an 11kw VFD from RS UK is £700

RS PRO Inverter Drive, 11 kW, 3 Phase, 380 → 480 V ac, 26.4 A | RS

uk.rs-online.com

Much cheaper than that around but variable quality.

 

[Onoff]

Or build a rotary one using an old 110V trannie. If I ever finish mine I'll let you know!

https://flic.kr/p/2mFZr3y

 

[piman]

Frank,

have you priced second hand generators in Crete, they must be available.

Personally that would be my choice, your 5 H.P. motor is a tad under 4 Kw, even a 5Kw generator should cope but larger may be advisable?

Alec

 

[pint]

depends on what the motor is running and how it starts.
if it starts with any load and no soft start it'll potentially take a lot more then 5kw

 

[Munkul]

20kva genny would be a generous capacity to start anything you needed.