Aloha all, I am going to build a 48V LFP battery pack to power a John Deere Gator that had about a half ton of lead acid batteries for energy storage. I need 400 Amps output (short time) from the battery. I would like to build a battery using sixteen 280 or 304 Ah prismatic LFP cells. I don't...
A friend has a Chinese made 24kW diesel pm 60 Hz 3 phase generator wired for single phase output (zig-zag I think). He is off grid here in Hawaii, and has used it for backup to his PV system occasionally. After he burnt up a few appliances, we looked at the output on my oscilloscope and found...
Is there anywhere in NESC that requires clearances be maintained (trees, structures etc) that would aid a person in climbing over the fence? I can't find this wording, although I thought it was in there somewhere.
K2ofKeyLargo
Are there any websites for selling excess electric utility inventory? I'd like to find a place to post what we have to offer to other utilities, not a middleman.
K2ofKeyLargo
I am an electric utility engineer. On a 20 mile long 25kV distribution feeder, 336.4kcmil AAC Tulip phase conductor with a 7#8 Alumaweld neutral, peak load about 9MW around 200A/phase. We are having trouble with voltage unbalance. Eighteen miles out on the feeder we have a set of three single...
When installing a bank of utility transformers, say 100kVA 25kv:277/480V, using three single phase transformers, what effect does unmatched impedance have on the operation of the bank? If one transformer is 2.0% and the other two are 1.6% for example, what will this do?
K2ofKeyLargo
Looking for anyone from an electric utility with experience on the use of lightning arresters on distribution lines, particularly using a lightning arrester in front of a cutout in an attempt to save the fuse from blowing when a lightning strike occurs. If you have actual experience before and...
What factors should be considered when sizing the neutral conductor on a single phase 120/240V service? A lot of utilities use a reduced neutral (ie Aluminum 4/0 for the two hot legs and a 2/0 neutral), but I understand harmonics from electronics can require a neutral at least as large as the...
The National Electrical Safety Code requires buried conduit to be "designed to withstand external forces to which it may be subjected..." The code says that live load in a roadway shall be the weight of a moving truck, which it gives a diagram to use showing the design forces and area of each...
How far can you run a 480V line to power a single phase 1500W .8pf load? I don't remember my transmission line theory - anyone know how to calculate this?
K2ofKeyLargo
Is anyone using a fuel cell to provide power to a load? We are an electric utility and have a single load that is 4 miles from our lines - We are considering a fuel cell and am looking for any comments on anyone who is actually using one.
K2ofKeyLargo
Is there a better commonly available choice of steel for deep draw application? I am hammering 16 ga. sheet steel, forming a 9" deep bowl 23" diameter from flat stock, thinning the metal to about 1/2 original thickness, building steel drums (musical instruments born in the Caribbean. Carbon...
