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Updated: 46 min 23 sec ago

Re: 2nd Hand Forklift Battery - Questions

1 hour 31 min ago
A better idea is to look local at scrap yards. Call around and see if they sell batteries to the public. Mine does. Head on down with a voltmeter, flashlight and a hydrometer. I got 4 brand new bulldozer VRLA batteries this way for 15 bucks a pop. 8d b...

Re: books or sites to learn batteries

1 hour 43 min ago
Unpopular opinion time. The power wall is a big joke and pretty much useless off grid. They designed it at a crazy high voltage where only an electrician can install it and most likely a company one at that, because its so high of a voltage they requir...

Re: Salt water batteries

1 hour 50 min ago
They cost a ton compared to lead. The only advantage is has is predictable life cycle and use. You get 3000 cycles regardless of DOD so using a smaller battery is more economical. Compared to a good fork truck tubular cell it really doesn't have enough...

Re: DIY Plante cell

1 hour 53 min ago
You can buy the polypropylene felt off of mcmaster-carr, its pretty cheap. 1.70 a sq foot i think.  Pretty sure they ship internationally. The other option is buying dry shipped batteries. Here in the states only surrette does this and those are costly...

Re: Maxing out my small off-grid system

5 hours 52 min ago
Hmm, got sent the wrong solar controller yesterday by my supplier.  This is where I would be had the right one been sent!



The controller is ch...

Re: DIY Plante cell

7 hours 17 min ago
I am somewhat limited by space, and I'd like to get my storage round-trip losses lower than seems sensibly possible with lead-acid in any format.

Plus I think that messing with lead and open H2SO4 in a busy council housing estate might be rightly frown...

Re: DIY Plante cell

7 hours 30 min ago
Yes, something I have also been thinking about.

Even just a heavy plate standard FLA types, but the Plante that your outlining sounds interesting?

I have re-built cells on batteries just as a test, but my problem was the comb and packing the plates in,...

DIY Plante cell

Fri, 06/24/2016 - 18:24
Hey folks, long time lurker, first time poster.

I recently have been reading a book called the battery builders. Very interesting book, completely shows how to rebuild or build both pasted and plante cells (more on paste than plante though). The more ...

Re: EMP...Faraday cage on solar panels?

Fri, 06/24/2016 - 14:25
I have read reports that said solar panels would likely survive an emp if they have proper lightning protection devices on the output of the string to clamp maximum voltages. Look for a device with the fastest response time. They might be degraded a bi...

Re: EMP...Faraday cage on solar panels?

Fri, 06/24/2016 - 00:48
for the light/radiation to damage the panel you'd have to be within the blast range. ie.. dead.

Re: EMP...Faraday cage on solar panels?

Thu, 06/23/2016 - 22:30
Would solar panels be trashed if not in use. Say stored in a basement or tunnel? How long would the blast last. Would we have any warning? Just wondering. 13

Re: EMP...Faraday cage on solar panels?

Thu, 06/23/2016 - 19:20
The flash from a nuclear explosion would fry your panels anyway. I have seen thunderstorm lightning so bright it caused my panels to turn the MPPT on in the middle of the night.

When the grid fails the world will return to the days of Fred Flintstone a...

Re: Arduino inverter load controller

Thu, 06/23/2016 - 05:24
Up date I have arduino uno,  9 volt wall wart.  Capacitors and relays are on order.

What else should i be getting?  Will  something be needed to cut the 135 volt from the panels

back for the uno?

Thanks

Re: EMP...Faraday cage on solar panels?

Wed, 06/22/2016 - 22:32
A faraday cage works in theory, but in practicality the cage has a resistance R. whatever current induced in the cage causes volts across it, which radiates it inside the cage.

The loop area available in any average system is too small (it can be made...

Re: EMP...Faraday cage on solar panels?

Wed, 06/22/2016 - 21:04
Quote from: joestue on June 20, 2016, 09:43:15 AMThe volts per kilometer produced by natural events is proportional to the area of the loop passing through the earths magnetic field. you need on the order of 100,000 square...

Re: BONDING TWO INVERTERS AT NEUTRAL

Wed, 06/22/2016 - 19:33
Quote from: jack11 on June 22, 2016, 06:08:51 PMOK, with this OH's explanation I begin to see what's going on.

I did the lamp test, connected a 25W 120Vac lamp between the battery (-) and the AC Neutral, the filament did n...

Re: BONDING TWO INVERTERS AT NEUTRAL

Wed, 06/22/2016 - 18:08
OK, with this OH's explanation I begin to see what's going on.

I did the lamp test, connected a 25W 120Vac lamp between the battery (-) and the AC Neutral, the filament did not light up at all (the lamp burns bright when plugged directly into this MSW ...

Re: BONDING TWO INVERTERS AT NEUTRAL

Wed, 06/22/2016 - 08:48
You seem stuck on this idea.  So, good luck.    I remember one of the inverters had a 100K resistor connected from the ground pin to the frame.  It is not an isolation transformer, it is a boost transformer.  They have a common shared with the negative...

Re: BONDING TWO INVERTERS AT NEUTRAL

Tue, 06/21/2016 - 19:29
it works, if the inverter N output can be grounded to battery negative or positive.

as others have said if there is ~55vac between N and battery negative (or positive) then it won't work.


connecting two inverters together at the neutral will be a smoke...

Re: BONDING TWO INVERTERS AT NEUTRAL

Tue, 06/21/2016 - 18:34
Thanks Johann, these are great videos, and the fellow seems really knowledgeable.

Seems like everything here hinges on the internal design of the inverter, not as much on the outside circuit, and that's tough to determine in general.

I took some measur...