Author Topic: Minimum Horse power to drive a ST10 genhead  (Read 210 times)

old seagull man

  • Jr. Member
  • **
  • Posts: 61
    • View Profile
Minimum Horse power to drive a ST10 genhead
« on: September 23, 2018, 01:55:54 PM »
Hi wanting to know from practical experience, what the minimum power is to drive an ST 10 type gen head, and get decent output? (at least 7-8kw)
 
I have seen you tube videos with s195 type engines but most are rated at 13.2 hp @2000 rpm, and i wondered if this was sufficient.
One my be available at a very reasonable price, in stead of a 5k version. That 13hp would most definitely drive.

By my math 742 watts per horse power, 10000watt generator 742 watts per horsepower about 13.4 hp.
Or do i have this completely wrong.

ajaffa1

  • Hero Member
  • *****
  • Posts: 809
    • View Profile
Re: Minimum Horse power to drive a ST10 genhead
« Reply #1 on: September 23, 2018, 02:57:08 PM »
Hi OSM, yes they should be a fair match. It is always better to have an alternator head that will stall an engine than to have an engine that would keep going and burn out a smaller head. Just be careful with the difference between run current on equipment and start up current. A motor may pull only 1 amp while running but could pull ten while starting up.

Bob

glort

  • Hero Member
  • *****
  • Posts: 2334
    • View Profile
Re: Minimum Horse power to drive a ST10 genhead
« Reply #2 on: September 23, 2018, 03:09:02 PM »

Rule of thumb is 2 engine HP per Kw of generated power. there will be losses in the friction of the drive belt and resistance of the alt itself even with no load.

7 Kw would come out at 14 hp, close to your calcs.

In my experience with the China Horizontal Cylinder engines, they will pull a lot over their rating. I have a 3.5 and it will outpull any 5 Or 6 Hp Diesel I have and won't even be smoking doing it. probably not ideal to run one that way for hours on end but I don't think an hour or 2 would worry it much.

7 Kw is a lot of power anyway. You could run a big hot water, an electric oven, pool pump, TV and lights all at the same time on that and still probably have power to spare.