Recent content by dehv

So dry type transformers seem to generally be oversized for the application due to the reduced cooling ability. So in theory how much of a gain would there be taking a small dry type, putting in oil? Would the saturation point be the limit rather than the temperature alone? Would it not do...

So. When bonding an aluminum PV rack, wouldnt Al wire be preferable to copper in that there would be less dissimilar metals in contact? Codes seem to say #6 copper, which seems silly on an aluminum rack. Are most rack lugs stainless, or an aluminum alloy that prevents corrosion, or should...

How do delete this post goshhhdarrrn

"Generally, inverters that comply with IEEE 1547 and UL 1741 will be acceptable for interconnection." This pdf is from 2019, but it's a good start.

With a single sunny island you will need a transformer to work with most (240v) micro inverters. Ideally get one with a split phase secondary built in (low freq).

But to get permitted in the future, or get grid hookup, would require rapid shutdown, dc arc fault and more headaches. Not to mention one cloud and the entire string of series panels go down, and a single point of failure in your string, vs a single micro inverter failure.

I specifically asked them NOT to ship with DHL, always a gongshow here. "Come pickup your package 75kms away", ya nah send it back.

Firefox keeps deleting my draft when I swap screens or attach a file. Anyway for the 3rd time, aliE tracking didnt work but i found the shipping co and track24 giving this, hopefully its not a spoof site to support the scam.

Looks like b grade 280ah cells are just over $100 us unshipped. These are only 100ah for almost 1/3 the price... I will report with future news if/when they arrive.

I wonder if i'm going to get burnt, ordered 24 of these $35cad ea shipped to Canada, supposedly NOS. This video says he saw similar but used cells seen for sale in thailand for $23us on "lazada"... Feedback looks ok-ish... they are supposed to take a looooong time to get here via boat, but...

Beware of CCA copper coated aluminum wire if shopping online.

Also if you have more than one string of panels, say two roof sides, it would be good to have a second controller for a separate mppt channel per roof side. This would add redundancy as well as longer life running each unit cooler.

If you will be doing construction You want low frequency inverter to start hard loads like air Compressors and power tools. Get a little inverter type generator to backup the solar, and make sure your solar is at least a cheap real mppt, ie a powmr/makeskyblue controller or better.

Those lithiums will take as much amps as possible. Also most chargers have 0.7 power factor so you have to derate accordingly. So 3300 generator (running not starting watts) x 0.7 , 2310 ÷56v = 41.25 amps So set you cc to limit to somewhere between 30 and 40. Start at 30a dc in settings and...

Are they 6048US models? I had a pair of those until my hillbilly lithium sans BMS system burnt down the power shed, but I recall from the manual: Being able to set them up with 3 for 3ph, or two for split 120/240 So if you have 8 why not do 2x 3ph and couple the DC bus of one 3phase trio to...