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Questions tagged [solar-panels]

For questions about photovoltaic panels or photovoltaic-based solar power systems.

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Need Recommendations for a Solar Attic Fan Setup [closed]

We have a roof with steep slope facing east/west and want the attic fans to run all day long. It seems that all solar attic fans are built to be used with only one panel per fan. Placing the panel on ...
Buggy Buggman's user avatar
0 votes
1 answer
87 views

I would like a switch that turns on when the sun is shining [closed]

I have solar panels, and would like to be able to turn things off when the sun is not shining and on when it is. All the mains switches I can find will only work the other way round. Can anyone help ...
Richard's user avatar
1 vote
1 answer
95 views

How does an inverter use excess solar capacity to charge a DC connected battery?

Given the following home solar setup: 10KW of solar panels 5KW (Fronius Gen24) inverter 10KWH DC attached battery And it is a sunny day with the potential of generating a full 10WK from the solar ...
Bobby T's user avatar
  • 13
3 votes
1 answer
61 views

What's the proper cable to connect this power station to a solar panel?

My uncle gave me his old 1000w portable power station. I already have a Bluetti SP120 portable solar panel that has mc4 connectors. I'd like to use this to the power station. I tried googling it to no ...
Christian Burgos's user avatar
0 votes
0 answers
40 views

Solar panel brackets not waterproofed correctly?

We are having solar panels installed. They just squirt some glue or caulking under the mounting bracket and bolted it to the roof. In the YouTube videos the installers always cover them with flashing ...
James Toomey's user avatar
0 votes
1 answer
68 views

Solar panels on a screw down metal roof?

I have a "screw down panel metal roof" where the fasteners are exposed. I've been told that the screws need to be retightened every few years because the screws will come loose over time due ...
Gary H's user avatar
  • 23
3 votes
3 answers
84 views

Power issues when extending a 12v DC cable from solar generator

Summary I have an AllPowers R600 Solar Generator, which can output AC and DC power I want to use it to power my laptop in the next room (approx. 4m away) The 1m charger works fine when I connect it ...
Martin's user avatar
  • 131
2 votes
2 answers
408 views

How can I simultaneously disable an inverter (that draws big currents) when switching off another circuit?

I have the setup below in my cabin. Currently I have to manually turn off the inverter for the 220V as well as the main switch when leaving the cabin. I would like the main switch to control both, by ...
oligofren's user avatar
  • 307
0 votes
0 answers
30 views

PV system Exchange rapid shut down switch by fuses

On the roof of my stand alone garage I have 60 solar pv panels, 2 inverters with each 3 strings of panels. So there are 10 panels on each string. The installer installed one rapid shut down switch for ...
Peter van Dijk's user avatar
1 vote
2 answers
83 views

What Would Cause a Solar PWM Charger to Occasionally Trigger an Inline Fuse?

I have 24v / 8a (400w) of solar running into a Renogy Wanderer Li 30A 12V PWM. I noticed that when at peak input capacity there was a chance for the in line fuse (20a) to trigger. I've added another ...
QueueHammer's user avatar
3 votes
1 answer
98 views

How to remove aluminum paint spots from tempered glass solar panels safely?

I had a contractor paint silver coating on my roof and some of the aluminum paint spots/speckled onto my solar panels. How can I remove the spots - what solvent is safe to use on solar panels? Can I ...
MonkeyBonkey's user avatar
  • 1,209
8 votes
3 answers
2k views

Solar-electric system not generating rated power

I bought a solar PV system a couple of months ago. It has 11 410-watt panels for a total of 4.5 kW. The first month it was cloudy and never generated over 3.2 kW of power. Now that it's been bright ...
Hannover Fist's user avatar
0 votes
2 answers
1k views

Can micro inverters be fooled to feed back-up when grid is down?

I have a small roof that barely fits 12 panels, a row of 8 in portrait on top, and a row of 4 in landscape below. The 4 will get some shadow on the bottom for about 4 months of the year, so they would ...
Louis Somers's user avatar
3 votes
2 answers
207 views

murray d100-22 main electrical panel bus bar rating (solar?)

Murray d100-22 main electrical panel bus bar rating It is a 20-slot. The wire coming from PG&E is a 2 AWG Alum wire. I want to install solar panels. And wondering what is the bus bar rating of the ...
user166159's user avatar
6 votes
3 answers
938 views

Is it a problem that the mounting screws of solar panels are not into framing?

I had solar installed last week. The past couple of days it has been raining so I went to my attic to check for any leaks. I didn't notice any leaks but I noticed the following: Mounting screws weren'...
user162793's user avatar
2 votes
1 answer
151 views

Grid tie solar breaker calculation for sub panel with single breaker main panel

My old house is wired as follows: A 100A service to a meter and main panel on the outside of the garage. Main panel has a single 100A breaker. A 125A rated sub panel inside the garage with house load ...
Dhiraj Bokde's user avatar
0 votes
4 answers
783 views

What battery type is most suitable to power a shed across temperature range -10C to +40C?

So I am gathering information on what I need to bring together to create a solar powered LED based lighting system for my shed. I need a battery, a charger controller for the battery, solar panel and ...
gyuunyuu's user avatar
  • 325
2 votes
0 answers
250 views

Sizing wire (calculating ampacity) for solar PV arrays

I have a solar photovoltaic array consisting of 9 PV modules interconnected in 3s-3p. They are the Jinko Solar JKM450M-60HL4-V panels. I want to know which size of wire I need to choose for the common/...
alejnavab's user avatar
  • 143
0 votes
4 answers
87 views

Water Heating and Photovoltaic Energy

I installed 5.5kW photovoltaic solar plant and I have a gas instantaneous heater for hot water. During the day, I have an excess of energy production and I would like to use it to heat water. However, ...
haran76's user avatar
-1 votes
2 answers
99 views

how to charge marine battery at my wall [closed]

i have all kinds of batteries in my house. when my xbox controller is out of battery, i charge it from my wall. when my phone is out of battery, i also plug it into the wall. i'd like to get a ...
Walrus the Cat's user avatar
1 vote
1 answer
137 views

Why does my 12 V, 500 Ah solar battery bank drop to 60% as soon as 4000 W inverter turns on pulling 2100 W?

I have five Inerstate DCM0100 wired up to give 12 V, 500 Ah. I have a Renogy 40A MPPT Rover Charge Controller. I have a Jarxioke 4000 watt inverter I purchased today. Precursor this knowing that I ...
user avatar
-1 votes
1 answer
194 views

Calculating wire size for solar array

How can I calculate wire size to go from a solar array (of 36 panels, 365W & 42V each) to a shed with an inverter 50 ft away?
i--'s user avatar
  • 263
2 votes
2 answers
169 views

How can I achieve blackout resilience on a grid-connected solar installation?

I recently installed a 3.6kw solar panel setup at home. I added an inverter and a 3.6kw battery. When I asked if that would work on case of a blackout the installer told me it won't - backfeed ...
Juan's user avatar
  • 161
0 votes
1 answer
80 views

How to estimate solar production on my roof, considering shade from trees

I am considering solar panels, and I have some trees in the neighbor's yard immediately to the south of my house. What's a relatively accurate way to estimate annual electrical production from a given ...
Mike Eng's user avatar
  • 196
2 votes
2 answers
197 views

Residential Solar Stopped Working

I've had my solar panels for a couple years now without issue. Installer is not in biz anymore and not answering calls, texts or emails. July 3rd mid-day it all stopped producing power. APSystems ...
mxmissile's user avatar
  • 163
0 votes
2 answers
112 views

Solar panels in rental - power plug

When living in a rental, if solar panels are hooked up in the traditional way they become part of the property, and have to be left behind when leaving the rental. When placing solar panels, how could ...
Daniël van den Berg's user avatar
1 vote
1 answer
993 views

How big of a solar panel is needed to run a 300 watt water pump?

I have a water pump in a pond that is rated as using 300 watts. I'm not concerned if it shuts off at night. Overcast days are super rare. I don't plan on installing batteries, just want to connect the ...
Village's user avatar
  • 1,045
-1 votes
1 answer
204 views

Where would a transformer be installed for a Tesup wind turbine? [closed]

2 months ago I ordered the New Tesup 5k Wind Turbine, and the Matching Charge Controller along with a Delta 5k Grid Tie inverter. I received and installed it 8 weeks ago. I've previously worked as ...
alovella's user avatar
0 votes
0 answers
111 views

Trying to improve and expand "professional" solar installation

Several years ago I contracted a local firm to install 56 solar panels on my roof. I know they used a licensed electrician and the utility company approved and installed my Net Meter but the system ...
drjrt's user avatar
  • 181
0 votes
1 answer
89 views

Changing a roofline for solar? [closed]

Our 1950's built mid-century modern home faces roughly south, which is great for solar panels. However, thanks to its super cute low slope roof, with gables and hips galore, and lots of vents and ...
Kyle's user avatar
  • 411
2 votes
3 answers
298 views

Am I on single-phase or 2-phase power?

Our power meter has two "branches" - one for ground floor and one for upper floor, and on the bill we've got 2 readings, again one for each floor. Also from the street we've got 2 mains ...
MLu's user avatar
  • 121
5 votes
2 answers
1k views

Like for Like Main Panel Replacement (PG&E)

I'm located in the bay area - PG&E territory. I have a Federal Pacific panel that needs to be replaced but it is within 3 feet of a gas line. My wires are underground so it'd require trenchwork ...
kai's user avatar
  • 51
0 votes
0 answers
164 views

Attempting to size grid tie solar system for 70 -80 kwh per day

Want to go grid tie mainly . (With a small back up I have already separate system ) I use less than 15kwh per day all summer max 70 kWh winter day. I can't build it all at once cost wise. I know the ...
user147829's user avatar
1 vote
0 answers
79 views

Can I have 100A main breaker with 100A main panel for solar panel?

I have an inverter with 21A output current. And will existing 100A main busbar with existing 100A center fed main breaker? I was looking online and there are articles about NEC rules for center fed ...
Tsendee Ts's user avatar
1 vote
1 answer
118 views

Is there any downside I need to know when I add new solar panels to existing ones?

I currently have about 12 LG solar panels installed on my roof. They only produce about 3kwh at peak sunlight condition even though they are nominally a 4kwh system. It is because of my house's ...
Anthony Kong's user avatar
2 votes
2 answers
2k views

how can a generator inlet peacefully co-exist with grid-connected solar?

I have a small grid-connected solar PV system. If it is connected to my main load center via a two-pole breaker, how can I safely add a generator inlet to this system ? The usual method is to ...
RustyShackleford's user avatar
3 votes
1 answer
236 views

What is the best layout of s240u solar panels to heat a pool with limited width?

I have 6 SunHeater S120U panels as suggested for my pool size according to the Installation and Operation Manual using a ground install. However, I am limited to 10 feet of width, which with ...
Doug Dekker's user avatar
2 votes
0 answers
115 views

What is the optimal number of solar panels for my house?

Just had a solar power tech stop by. With the orientation of our house and the solar load, our property (house + workshop) can support roughly 41 panels. Each panel provides 370 W (max)...which ...
tnknepp's user avatar
  • 1,376
1 vote
2 answers
127 views

How I can find out what size solar panels I will need in order to power a single air conditioner?

I am thinking to buy an air conditioner, but I want to power it using solar power in order to avoid increasing my personal CO2 emissions. I am thinking to buy a small 9000BTU one and for personal ...
Dimitrios Desyllas's user avatar
-1 votes
1 answer
81 views

What are the process and considerations to get off-grid using solar panels? [closed]

Can anyone tell me what type of solar panel is considered the best for generation of power and price? I already have 3.5 KW of Solar PV on my roof which I benefit from the UK Feed In Tariff. Now I ...
SPlatten's user avatar
  • 161
0 votes
1 answer
69 views

Anything forward-thinking things to do regarding solar panels when putting a new roof on?

If you were putting a new roof on now on a shed or garage, and solar panels were a real possibility in the next two or three years (for lights and light-duty electric tools), what things, if any, ...
mr blint's user avatar
  • 1,870
1 vote
2 answers
789 views

Can I have net-metering with an ATS between utility and batteries and diverse power inputs (solar, wind, generator) behind the batteries?

I would like to participate in net-metering until I have a solar array large enough to disconnect from the grid entirely. However, for various reasons, I am going to have an undersized solar array ...
user227963's user avatar
  • 1,078
0 votes
2 answers
252 views

Are there drawbacks to using solar panels as a roof without asphalt shingles underneath?

If you're working with a new construction or a very old roof in need of full replacement, why not forego asphalt shingles altogether when installing solar panels on the roof? It seems like a waste to ...
ElectronHammer's user avatar
2 votes
5 answers
2k views

Could I conceivably use power from my neighbors (hypothetical) solar panels in the event of a blackout?

I know some people have solar panels and produce excess power that they then sell back to the grid. Since they generate some amount of power that they could sell back to the grid. So hypothetically, ...
Sidney's user avatar
  • 1,665
1 vote
4 answers
1k views

Solar panels: converter has AC Voltage out of range

Since about six months our house has solar panels. There's a converter (4600 W) with two inputs hooked up to 6 and 7 solar panels respectively of 325 watt peak performance. Overall this setup runs ...
steenbergh's user avatar
1 vote
1 answer
110 views

Need help buying the right sized off-grid solar system

I'm planning on using solar power to supply electricity to a 12x24' building. This building will be located near our main house, but will have no connections to the house, electrical or otherwise. It ...
Bob Mathews's user avatar
2 votes
1 answer
61 views

Determine highest "carbon reduced per dollar spent" option for reducing pollution generated by home?

I've been talking with friends and coworkers about how I can reduce the amount of pollution generated by my house (heating the air, heating the water, cooking the food, etc.) Everybody has a ...
Betty Crokker's user avatar
2 votes
0 answers
65 views

"Non-Retail" House Battery

I need a ~3.5kw battery to power an emergency circuit if the power goes down. I've been quoted $13,000 to add an LG Chem 9kw to our existing system but that does not include the inverter upgrade. ...
acpilot's user avatar
  • 189
-3 votes
1 answer
94 views

My Idea to get off grid while still in my neighborhood [closed]

How can we live somewhat off the grid without having to dig a well? . Solar Energy System for the house gets you off the power grid reliance and can actually get you paid for providing energy to the ...
John Gentry's user avatar
1 vote
2 answers
1k views

Can I connect a normal 12 Volt 150AH C10 battery with a solar 12 volt 150AH C20 battery in series for my 24Volt solar system

I have an Exide invamaster 1500imst short tubeler normal battery of 12 volt, 150AH, C10. Now I want to connect this battery with a solar battery of 12 volt, 150AH, C20. Can I connect this normal 12 ...
Kiran Dutta's user avatar