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Batteries for a new system help please!

Discussion Board - 1 hour 11 min ago
Ok had a 12 volt system in the old house. We tore it down, now going to a 24 volt system. Have 1360 watts(24v) flex panels for the roof, and about 800 watts(12v) from the old system. Went to a Outback charger, and a Magnum Inverter. The old system had ...

Re: A look at Peltier cooling

Discussion Board - 3 hours 4 min ago
The larger heatsink idea poked me to ask:

In our Peltier devices, we use a copper or aluminum heatsink to accumulate heat and release it to the air. People who use stacked Peltiers for computer cooling to near-freezing temps may even dump the heat furt...

Re: Polycarbonate roof sheeting for solar hot water

Discussion Board - 4 hours 41 min ago
Quote from: Roadie on March 27, 2015, 12:59:57 PMIs it relatively easy to compress methane into a standard gas bottle
Yes & No;
There is the right way, which when done right doesn't use more power than it takes to ...

Re: ATmega328P for OpenTRV use

Discussion Board - 5 hours 39 min ago
Forecast winds peaking at about 50mph here (well LHR/EGLL airport) overnight with gusts to 60mph and running though tomorrow, just as I notice that my little turbine is falling apart.  May have to take it down in advance or attempt to fix it up or tie ...

Re: Energy efficient box fans

Discussion Board - Sun, 03/29/2015 - 16:48
Looking at specs online on low the typical box fan is moving about 1,000 CFM of air. So now the search is one for a low power 24 volt DC motor to graft into it. That many muffin fans would sound like a jet engine!

Re: Energy efficient box fans

Discussion Board - Sun, 03/29/2015 - 16:41
inverters reside in the living room which is also the coldest floor in the house! No basement under this end. Bathroom end is cold when I have the corn stove running so that is why the fan. I need to see how many CFM I am moving now and look at small 2...

Re: Reactive boost for mosfet inverter

Discussion Board - Sun, 03/29/2015 - 15:12
My fridge just had just a PTC on the start winding.  I replaced it with a 200uF cap I think when I was trying to get it to start with a 1K inverter.  Never actually tested it both ways, the cap is still there and that is where I got the 120A reading.  ...

Re: Reactive boost for mosfet inverter

Discussion Board - Sun, 03/29/2015 - 15:00
Yes, a capacitor should help the torque, and this may get it started in time..

They are relying on higher wire resistance in the start windings only for the phase change from the looks... the cap should make this more efficient.... try different sizes ...

Re: Reactive boost for mosfet inverter

Discussion Board - Sun, 03/29/2015 - 14:05
I opened the a/c unit and the compressor is a Quigan rotary. YZG-A045Y2D2T1
It's supposed to have a 30mfd/250v capacitor but the cheap scumbags that made it for Home Depot substituted a klixon.
A rotary compressor should not be that hard to start. The ...

A Bug, SMA Sunny Island, 50HZ leaps to 60HZ, SI6,OH-11

Discussion Board - Sun, 03/29/2015 - 13:31
The Sunny Island 6kw Inverter Charger & AC Coupler.

I have posted this in Reviews...........


Its a fault I believe with software...

Re: Reactive boost for mosfet inverter

Discussion Board - Sun, 03/29/2015 - 12:25
The inverter voltage sags and the battery in the vehicle is being pulled down by the surge and this is with the engine running and a fairly new battery. I suspect the inverter simply can't supply the surge. Once running, it doesn't seem to use much pow...

Re: Managing opportunity and dump loads

Discussion Board - Sun, 03/29/2015 - 07:06
I'm trying a slightly different approach.  Perhaps it may shed some light on things.  I've changed the aux 2 water heater diversion to the "Waste Not Hi" mode, aka "Louie-Louie"  ('Ui-Loi', Use It Or Lose It).  From observation, the controller seems to...

Re: Reactive boost for mosfet inverter

Discussion Board - Sun, 03/29/2015 - 04:24
One more thing that might get you through startup.    Get an on delay timer for the fan and set it to one minute or more. That way you won't be starting two motors at the same time.

Re: New project

Discussion Board - Sun, 03/29/2015 - 04:18
By chance we are in France. Planning permission was easy as we have one point of contact (the mayor). I sketched my plan on the back of a napkin over a few beers with an architect mate and he later drew up a quick set of plans which I submitted. A mont...

Re: Maint

Discussion Board - Sat, 03/28/2015 - 23:55
Thanks JW.  Both are welcome improvements, especially the Recent Posts list.

Re: New project

Discussion Board - Sat, 03/28/2015 - 23:47
It roughly says....

No one can object to your generation of electricity and self consumption installations, as long as you satisfy the appropriate regulations, example, Wind turbines must not be more than 12m, (40ft) high, (any higher then you need ful...

Re: New project

Discussion Board - Sat, 03/28/2015 - 23:36
Regards Electricty Generation in France.

We have 5kW PV on trackers, 2.5kW PV static array, 3 off HughP's 3.7m (12 footers) 4.5kW, Diameter Wind Turbines, all officially approved and all submitted to the Regional authorities etc, no costs, but just a f...

Re: New project

Discussion Board - Sat, 03/28/2015 - 23:06
Very interesting.

I would love to do something similar here with our small river, 500gals/second, unfortunately here in Normandy, France, using water that passes through our land is very difficult to get the necessary regulatory permissions.

And the lo...

Re: Reactive boost for mosfet inverter

Discussion Board - Sat, 03/28/2015 - 22:59
Only if your battery pack is a bit feeble or it has small wires.
Your problem is in the pre H bridge stage. It will use a push pull pwm to take the 12v to 160vdc. This is stored in your HV caps. This is all you have to power a surge + the power the lit...

Re: New project

Discussion Board - Sat, 03/28/2015 - 22:56
What was done for the fish in the creek and what did you put in for the protection so fish will not go threw your machinery? Just asking. 13
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