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From looking at those 2 bills it appears annual usage is 91,000 kWh. I looked at OPs roof and it looks like at least 84 * 400w panels will fit but in various orientations for 34kW total, maybe more. According to PVwatts that's 65,000 kWh/year in LV or 71% of annual usage. I would go for maximum...

Some contrast/brightness magic reveals Renesas RX24T8 32bit 80Mhz MCU that runs motor inverters and probably refrigerant cycle logic as well.

On slowest speed total power consumption is 316V * 0.34A = 107 watts. Outlet air temp is 57F and intake is 72F. With 95% efficient 12v to 316V dc-dc converter you could run it on 12V LFP battery with only 9 amps. Perfect for vans or camping.

Sure something like PV isolator switch. But if you insist on using fuses/breakers then at least install them inside steel enclosure. Same for PV surge protectors. Another interesting point is that fuses are ineffective until 2x rated current. So for 10A panels you'd use 15A fuse that will not...

Yes for example lets take NXP semiconductors that sold their LDMOS transistor division with patents to Chinese investors (renamed into Ampleon) so now we have to pay 15% tariff and soon 50% on western designed parts made in China because Chinese bought the rights to it. I'd love to see tariff...

Building Biology Environmental Consultant, ElectroMagnetic Radiation Specialist :ROFLMAO::rolleyes: This guy takes takes 1st place in pseudo science title olympics. Beats that EMP guy. Dude's got Bachelor of Arts degree...

You need at least 36 kW of solar and 96 kWh of storage (2000Ah) to support 6kW 24/7 from one 4 hour sun day.

I think OP is being unreasonable. Signature Solar deserves the right to defend themselves and should publish full transcript of their interaction with OP with private info redacted.

So? Bury it deep if you don't want to use it ever again. Spent fuel stays solid and compact. I would store it for few hundred years for radioactivity to decay to easily manageable levels then pull it back up to reprocess and keep using it. Spent fuel from light water reactors still has over 90%...

This gives me an idea how to better protect parallel batteries. Install current shunt or hall shunt and contactor on each series string. If current sharing suddenly deviates from equilibrium then disconnect offending string. Doing this prevents other good strings from dumping current into...

Here is a start of something scary.

Does not have to. Please excuse my ugly drawing. Still need to figure out which wire was bonding to shipping container via 120v outlet or if there was earth ground connection to the Growatt. Need more info.

You are better off with small and efficient wood stove. Make sure to recapture exhaust heat to avoid dumping useful energy to the outside. 1 pound of dry wood produces 2.5 kWh of heat. With an air source heat pump you may end up with coefficient of performance (COP) of 3 with mild temps and down...

$9000 you spent on batteries would buy you 50 years of that $15 grid fee. Batteries only make sense if your peak demand rate - solar buyback rate is greater than battery cost per cycle. With LFP battery it's roughly $292/kWh / 4800 cycles = 6.1 cents / kWh but assuming they do last 20 years /...

Come on Costco stop tempting me.

Found couple FT240-31 chokes and measured their attenuation. Here are results in dB for attenuation for 20 turns, 26 turns and both of those chokes connected in series. Right table side shows difference between two chokes in positive attenuation dB. For example at 28.3MHz going from 20 to 26...

They appear like legit MOV based surge protectors designed for lightning impulses but should not be promoted as nuclear EMP protection devices because that kind of protection requires more system hardening steps beyond just installing MOVs at your entrance panel.

Looks like 2024 will bring even lower battery prices. Expect grade A 280Ah cells to retail for $75 in USA.

Small variable speed window AC for the bedroom to keep central AC unit off most of the time. So far managing 1000 kWh per month during past 5 summer south Florida months. Master bedroom measures window AC plus LED ceiling lights. Total energy for house cooling was 3300 kWh or 62% of total energy...

My Nissan Leaf's AC compressor uses 500 watts, thermostat set to 60F low fan speed (90F outside) when parked while the rest of the car uses 600w. In total 1100w is draining the battery equivalent to 5 mi of range per hour. Battery does not overheat. Power data is pulled with LeafSpy app.

Simple voltage shunt circuit to balance LFP cells. R8 and R9 sets shunting threshold to 3.45V and placed away from heat generating parts to reduce voltage drift. Shunting current should be around 0.38A should be enough to keep 100A cells in balance. Single sided PCB no holes or vias, easy to...

It very well may have an issue. It could have short circuit detection implemented by measuring the speed of current rise and not just reacting to current level setpoint. This has to be tested by someone with access to this battery and digital oscilloscope with DC current probe or shunt. To me...

That's fine. Cell jellyroll does not extend into that area. Most expansion happens in middle side. I would insert 1/2" (12.7mm) thick aluminum or 1/4" (6.4mm) steel plate on each side of cell stack in between compression corner clamp and the cell to spread that compression force toward cell...

I applied 42V 10A to second panel that was scratched but not shattered to look for hot spots from poorly soldered cell wire interconnects. Discovered 3 hot spots across 4 cells that were hit by the forklift through first shattered panel. No hot spots or anomalies anywhere else. The setup...

Send it to me I will take it apart and find lots of design flaws about it ;)

Can't wait for videos. Bonus points if this new place will be fully off-grid!

No lol. This was a joke. But notice how panels are laid on the roof unfastened with extension cords running down into garage. This is DIYsolar taken to the max.

Most Chinese battery module assemblers don't seem to care about proper battery engineering. You get what you pay for.

You ruined that module by cutting it. Now there is no way to reliably connect to upper left battery terminal without laser welding and cell structural compression is gone. Only good now for cell harvesting making it worth ~ $50/kWh. Sell complete modules next time.

You may be picking up magnetic fields from currents inside the inverter or inverter enclosure is radiating. There is another way to test common mode current radiating over wires connected to inverter. Take clamp on ferrite core or split core and clamp it on a pair of wires, for example AC out...