Search found 867 matches

by TPA
May 31 2019 1:37pm
Forum: Alternative Energy
Topic: Inverter recommendations, 48V sine wave, no grid tie
Replies: 15
Views: 941

Re: Inverter recommendations, 48V sine wave, no grid tie

I want to offer a suggestion from some research I've done myself, but I must mention that I have not used this product and cannot vouch for build quality or reliability. It gets good reviews everywhere I look at it, and seems like the best value for an inverter on the market. https://www.thesolarbiz...
by TPA
Apr 16 2019 12:34pm
Forum: Alternative Energy
Topic: Solar Well Pump
Replies: 6
Views: 773

Re: Solar Well Pump

I think I am very close with this device. If I could get one at 15A, it would be just right.

https://www.amazon.com/Time-Delay-Relay ... B007ID7OXI
by TPA
Mar 25 2019 3:55pm
Forum: Alternative Energy
Topic: Solar Well Pump
Replies: 6
Views: 773

Solar Well Pump

I need to see if you guys know if a product exists. What I would like to do is add a fail safe mechanism to a water well PV system. It will be a basic dedicated off grid system: Grundfos well pump 230V (the pump is the only load at 1400-1500W except maybe a light in the well house). 3 200W solar pan...
by TPA
Feb 14 2018 4:41pm
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

I have not hooked this thing up yet and tried it out. Something keeps nagging at me. I have not been able to explain what my hangup is, so I'm hoping this diagram will make it clearer. The top figure represents a sinewave from a single leg (L1) of typical US household power service. The RMS output i...
by TPA
Feb 08 2018 9:22am
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

You know, it's strange how you get roped into thinking one way, and can't see outside that box. I know that household current is 240V because of 2-120V lines out of phase with each other. It didn't occur to me that it would not matter if I wired a phase and neutral (one single waveform) to the pump ...
by TPA
Feb 07 2018 7:36pm
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

OK, I got it working... I wired it up by paralleling the primary and the secondary in series. I got 246V across the the ends of the secondary, and 123V one each leg relative to the center tap. I wish I had an oscilloscope so I could verify that one leg is anti-phase to the other. The well pump wires...
by TPA
Feb 07 2018 11:57am
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

So, impedance stops the primary side from being a short circuit?

Does there need to be a load on the secondary to create the impedance similar to the way a generator can spin freely until a load is applied?
by TPA
Feb 07 2018 11:46am
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

Well, I'm currently testing with the wall outlet in my shop. It is tripping the breaker for that circuit.

I will double check everything next time I'm working on it, and report back.
by TPA
Feb 07 2018 7:54am
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

I am getting the dead short condition trying to apply 120V to the primary. I am sure that I am wiring it correctly. Am I understanding right that the transformer needs to saturate (create enough impedance) to decrease the current flow in order to stop tripping the breaker? I'm pretty sure this trans...
by TPA
Feb 06 2018 10:00pm
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

I didn't really want to explain why I wanted to do this because it becomes a sidetrack to getting to the answer, but you guys seem to be very helpful to my main purpose so I will gladly explain. I have a Grundfos SQ well pump that Gets used infrequently to supply water for gardening. It has a soft s...
by TPA
Feb 05 2018 7:57pm
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Re: Need help with a transformer

Thanks for the help. When I wire L1 (the hot wire from the transformer) to H1, then the neutral wire to H2, all I get is a dead short. I've been testing with a standard household outlet which behaves the same way as the inverter. Also, wiring this way would only end up with 240v on L1. What I need i...
by TPA
Feb 04 2018 3:36pm
Forum: Alternative Energy
Topic: Need help with a transformer
Replies: 22
Views: 2140

Need help with a transformer

transformer.jpg With regard to the above transformer photo, it is possible to wire it 1:1, so here is what I want to do... I have a Xantrex Prowatt SW2000 inverter. It puts out power the same way that standard household power is delivered (L1 on one prong and neutral on the other.) These transforme...
by TPA
Dec 28 2011 7:09pm
Forum: Battery Technology
Topic: Anyone have "interesting" uses 4 their old crappy cells?
Replies: 19
Views: 882

Re: Anyone have "interesting" uses 4 their old crappy cells?

I have this electric start mower that had a crappy sla battery that required a recharge after every outing. I used a 5Ah 4s lipo pack charged to 4.2v per cell this past year. At the end of the mowing season the cells were still at 4.0v without ever having to charge. The starter was a little zippier ...
by TPA
Dec 26 2011 11:43pm
Forum: Polls & Surveys
Topic: Lamp oil. Rope. Bombs?
Replies: 10
Views: 3783

Re: Lamp oil. Rope. Bombs?

...and Link drops by for a visit.

How long has it been Link, two years?

Do you document your hobbies anywhere? It would be interesting to see what the boy genius is up to.
by TPA
Dec 01 2011 1:22pm
Forum: General Discussion
Topic: Endless-sphere Timeline.
Replies: 77
Views: 38774

Re: Endless-sphere Timeline.

Safe constantly mentioned that he was getting 40-50mph out of his 1000W motor.

There is zero chance he is doing those speeds at 1000W.
He was not limiting himself to 1000W.
by TPA
Nov 14 2011 1:05am
Forum: Alternative Energy
Topic: Bad News for Solar Panel Industry
Replies: 23
Views: 3663

Re: Bad News for Solar Panel Industry

Evergreen shut down.

Sunelec just won all their panel inventory at auction, they are being liquidated at $0.78/Watt until Monday 11/15/11.
by TPA
Nov 13 2011 6:11pm
Forum: Battery Technology
Topic: Bosch 36V fatpacks opened up
Replies: 600
Views: 72568

Re: Bosch 36V fatpacks opened up

Just did a complete charge and discharge cycle. Pack is 6P fatpacks. Started at 41.5V, rode 14.5 miles absolutely no pedaling, ended at 31.9V, and used 12.6Ah (according to cycle analyst). Recharged 12.5Ah (according to Watts-Up meter). That's as much Ah as this pack has ever delivered. I'd say stil...
by TPA
Nov 13 2011 2:37pm
Forum: Battery Technology
Topic: Bosch 36V fatpacks opened up
Replies: 600
Views: 72568

Re: Bosch 36V fatpacks opened up

Update on my fatpacks: I purchased 6 fatpacks in July 2009. When I purchased them, they were "New-Old Stock" and were already a year old when I got them. I have not cycled them frequently, I accidentally discharged to zero volts, and now they have been in storage for a full year. The pack is about 3...
by TPA
Aug 21 2011 11:35am
Forum: E-Bike Technical
Topic: Throttle Adaptions & Alternatives
Replies: 7
Views: 1409

Re: Throttle Adaptions & Alternatives

Here is what I did for cruise control:
throttle.jpg
Leave the clamp on the entire time. It allows the throttle to turn, but clamps it in place wherever you last left it. Gets in the way a little though.
by TPA
Aug 20 2011 11:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: E bike by just driving the rear freewheel
Replies: 4
Views: 804

Re: E bike by just driving the rear freewheel

There are lefty freewheels that could accomplish the task.

This could possibly be the lowest cost way to adapt RC equipment if you mounted the entire drive system at the rear wheel.
by TPA
Aug 20 2011 11:14pm
Forum: E-Bike Technical
Topic: Throttle Adaptions & Alternatives
Replies: 7
Views: 1409

Re: Throttle Adaptions & Alternatives

Russell experimented with a trigger throttle to great success. I don't think you can find them new anymore, but you can get them used and maybe on ebay. Here is a couple of used ones http://www.bladezscooters.com/catalog/index.php?main_page=product_info&products_id=850 And here is Russells adaptatio...
by TPA
Aug 20 2011 10:45pm
Forum: E-Bike General Discussion
Topic: Breaking #25 chain?
Replies: 5
Views: 659

Re: Breaking #25 chain?

small diameter short piece of pipe
short push pin
bench vise

nuff said
by TPA
Aug 20 2011 8:16pm
Forum: E-Bike Non-hub Motor Drives
Topic: Y-pedal's two stage RC drive..........
Replies: 692
Views: 74021

Re: Y-pedal's two stage RC drive..........

Ha! I mock and scoff at your 30C
weather aug20.JPG
*More mocking and scoffing*
by TPA
Aug 19 2011 12:33pm
Forum: Battery Technology
Topic: Zippy/ Flightmax / Turnigy/ Blue lipo testing (pt 2)
Replies: 281
Views: 30112

Re: Zippy/ Flightmax / Turnigy/ Blue lipo testing (pt 2)

I'm about ready to get some a123 pouch cells. Yea, but where. Only place I know of is from this place: http://www.a123rc.com/goods-468-Excitingly+Powerful+A+123+PRISMATIC+CELLS.html currently on sale. Has anyone heard of a123 pouches in different Ah sizes? 10Ah would be ideal for me. I found 15ah o...