Re: [EVDL] Off-grid solar house and electric car charging

Robert Bruninga via EV wrote: The only time high voltage helps is when you need to have long wire runs... The operative word is "long" And when you wire a house for every room and for every appliance and for every outlet (whether used fully or not) then every wire is "long". What is "long"

Re: [EVDL] Off-grid solar house and electric car charging

Just to clarify... >The only time high voltage helps is when you need to have > long wire runs [and long means over a few tens of feet] > > However, if you're using small low-voltage individual inverters > mounted right on each panel to one big central inverter located > far away, then the

Re: [EVDL] Off-grid solar house and (series//parallel)

Sorry, this is still misleading in the real world. > Identical wire sizes, wire lengths, and wire resistive losses, > regardless of whether wired for low voltage or high voltage. There is no way you can wire 14 solar panels (10' by 20') array in parallel with the "same wire sizes and lengths"

Re: [EVDL] Off-grid solar house and electric car charging

I thought the original question was about wiring an off grid house for low voltage DC versus throughout and using all DC appliances and equipment instead of 120/240 VAC like all other houses -Original Message- > I think Lee was referring to how you wire the panels together, > not the

Re: [EVDL] Off-grid solar house and electric car charging

David Kerzel wrote: In example 1 series you have 2 12 inch leads out of the pack. In example 2 parallel you use all the leads to connect them together and the 12 inch leads out of the pack are missing, They would add .001 ohm each if the same size wire which is a second 40 watts. View with a

Re: [EVDL] Samsung wises up

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Re: [EVDL] Off-grid solar house and electric car charging

Peri Hartman via EV wrote: I think Lee was referring to how you wire the panels together, not the house. You could wire your panels in parallel and, as long as your inverter is near the panels, not incur any more line losses than a series system. Right! PV panels are physically large, even

Re: [EVDL] Off-grid solar house and electric car charging

Im sorry again, but this is simply not true when expanded to WIRE LOSS. > No; AC voltages and currents... (Root-Mean-Square). > RMS voltages and currents have the *same* effective > values, voltage drops, and losses as DC. 120vac and > 120vdc are completely equivalent. Yes, as far as VOLTS and

Re: [EVDL] Off-grid solar house and electric car charging

Robert Bruninga via EV wrote: Still not true. The output of microinverters is at 240 VAC and the average current in the wires will be double as the same number of panels at 480 VDC. But each microinverter has its own wire. The total current may be twice as much in a 240v system as in a 480v

Re: [EVDL] Off-grid solar house and electric car charging

Robert Bruninga wrote: > Yes, as far as VOLTS and as AMPS as averages are concerned. Such as > average power. A 1500W resistor will be 1500W whether on DC or RMS AC. > > But the power loss in wires feeding that resistor will have greater loss > on AC because of two factors important in

Re: [EVDL] Off-grid solar house and electric car charging

Robert, I'm not sure how much effect the Skin Effect has. But for #2, peak power losses, you also need to consider that part of the wave form is *below* the average voltage, thus contributing significantly *less* resistance. You can't just look at the resistance caused by the peak voltage.

Re: [EVDL] Off-grid solar house and electric car charging

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Re: [EVDL] Off-grid solar house and electric car charging

Roger Stockton quoted: "For a cyclically alternating electric current, RMS is equal to the value of the direct current that would produce the same power dissipation in a resistive load." - Roger, You used the wrong definition. The Wikipedia quote

Re: [EVDL] Off-grid solar house and electric car charging

I am aware of industry looking at High Voltage DC transmission lines in two distinct areas: Underseas transportation to islands or between continents and for long distance coupling of distribution nets. The reasons for DC are rather simple and that is that when the transmission line length

Re: [EVDL] Off-grid solar house and electric car charging

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Re: [EVDL] Off-grid solar house and electric car charging

It's funny to see this discussion about panels. I spent 2 hours on the roof yesterday watching the Solar installer find a roof leak under the junction box. (Each person defines his own "fun" :-) (It took about 4 years to show up in a storm) (Apparently, they stopped the practice of gluing the

Re: [EVDL] Off-grid solar house and electric car charging

Re RMS: This stuff is tricky. I don't blame folks for being confused. If you're powering a resistive load, AC RMS and DC are identical. Line losses are the same. The resistance in the wire is no different than the resistance in the load. The losses and power dissipated in both of them are the

Re: [EVDL] Off-grid solar house and electric car charging

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Re: [EVDL] Off-grid solar house and electric car charging

I have installed both micro-inverter Solar systems and central inverter series-string Solar systems, both as a volunteer for SunWork in Palo Alto. The series-string system uses the wires already attached to the solar panels to create a single string (up to 10-12 panels) or two independent (not

Re: [EVDL] Off-grid solar house and (series//parallel)

Robert Bruninga via EV wrote: There is no way you can wire 14 solar panels (10' by 20') array in parallel with the "same wire sizes and lengths" (and loss) compared to series. Physically impossible. Bob, "impossible" is not a useful word here. I'm not trying to argue or "win". I just want to

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Re: [EVDL] Off-grid solar house and electric car charging

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Re: [EVDL] Off-grid solar house and electric car charging

In example 1 series you have 2 12 inch leads out of the pack. In example 2 parallel you use all the leads to connect them together and the 12 inch leads out of the pack are missing, They would add .001 ohm each if the same size wire which is a second 40 watts. david -Original Message-

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Re: [EVDL] Off-grid solar house and electric car charging

> The only time high voltage helps is when you need to have long wire runs... The operative word is "long" And when you wire a house for every room and for every appliance and for every outlet (whether used fully or not) then every wire is "long". The academic argument below is like saying

Re: [EVDL] Off-grid solar house and electric car charging

Cor van de Water wrote: > Roger, > You used the wrong definition. The Wikipedia quote is about the power > delivered to the *load* but the discussion was about the power losses in > the *wire* feeding the load. No; just as the power dissipated in a resistive load remains the same, the power

Re: [EVDL] Off-grid solar house and electric car charging

Ah, my bad, you are correct - I got confused with power factor concerns but indeed for pure sine AC the RMS will make AC power identical to DC power in both load and wires. Thanks for clarifying and setting me straight! Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626

Re: [EVDL] Off-grid solar house and electric car charging

I think Lee was referring to how you wire the panels together, not the house. You could wire your panels in parallel and, as long as your inverter is near the panels, not incur any more line losses than a series system. Peri -- Original Message -- From: "Robert Bruninga via EV"