Re: [Emc-users] Increasingly OT: [Was: Re: How come.... --> battery safety due to high current, DC relay

2019-05-30 Thread Chris Albertson
On Thu, May 30, 2019 at 8:12 AM Nicklas Karlsson < nicklas.karlsso...@gmail.com> wrote: > > Theoretically, yes, an inverter would then also have less I²R losses than > > at 48v. And there are 120v inverters ... > > Yes but there might be difference in voltage drop for transistors then > maximum

Re: [Emc-users] Increasingly OT: [Was: Re: How come.... --> battery safety due to high current, DC relay

2019-05-30 Thread Nicklas Karlsson
> Theoretically, yes, an inverter would then also have less I²R losses than > at 48v. And there are 120v inverters ... Yes but there might be difference in voltage drop for transistors then maximum current is lower. For an electric motor sum of currents is the same so then wind for a higher

Re: [Emc-users] Increasingly OT: [Was: Re: How come.... --> battery safety due to high current, DC relay

2019-05-28 Thread Erik Christiansen
On 26.05.19 13:07, Dave Cole wrote: > There are some good reasons to use a 24 or 48 volt DC bus power system for > smaller systems. > The chance of electrocution is pretty low for a 48 volt DC system in a dry > environment. > Once you get above 50 volts or so things change. Here in Oz, a

Re: [Emc-users] Increasingly OT: [Was: Re: How come.... --> battery safety due to high current, DC relay

2019-05-26 Thread Dave Cole
There are some good reasons to use a 24 or 48 volt DC bus power system for smaller systems. The chance of electrocution is pretty low for a 48 volt DC system in a dry environment. Once you get above 50 volts or so things change. 24 volts is quite a practical voltage level for smaller systems.

Re: [Emc-users] Increasingly OT: [Was: Re: How come.... --> battery safety due to high current, DC relay

2019-05-21 Thread Chris Albertson
On Tue, May 21, 2019 at 1:54 AM Erik Christiansen wrote: > On 21.05.19 00:31, Chris Albertson wrote: > > On Mon, May 20, 2019 at 7:55 PM Erik Christiansen < > dva...@internode.on.net> > > wrote: > > > > > > > > Switching normal loads is back to less than 100 A for less than 5 kW, > but > > >

[Emc-users] Increasingly OT: [Was: Re: How come.... --> battery safety due to high current, DC relay

2019-05-21 Thread Erik Christiansen
On 21.05.19 00:31, Chris Albertson wrote: > On Mon, May 20, 2019 at 7:55 PM Erik Christiansen > wrote: > > > > > Switching normal loads is back to less than 100 A for less than 5 kW, but > > still hard on contacts. (The contacts on the starter solenoid for an old > > Caterpillar D6 are blocks of