Questions tagged [solar-panels]

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

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3answers
39 views

Are there power transfer switches with various and diverse input types?

If you have solar, you might get a manual transfer switch between utility and solar. Both of those would be hard wired. So let's say you had solar and utility power AND a generator ... I see there ...
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2answers
46 views

What specs to look for in solar panels to know it can power a product?

I wish to run a pond pump (such as this here) off of solar electricity, because the electricity in my area is very expensive, but clouds are rare. For this example, it is listed as running on 199 ...
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2answers
52 views

Solar system with both grid tie-in and backup power without battery? [duplicate]

My wife and I have been talking for a few years now about getting some solar panels installed on our roof. We even went so far as to have a sales rep for an installer come out and talk through our ...
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3answers
268 views

Adding critical-loads sub-panel with a PV install, rationale and ampacity calculation

I'm considering adding a critical-loads subpanel near my main load center, in conjunction with a small grid-tie solar system, and with connection for backup power. Please critique my rationale for ...
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2answers
43 views

Does it matter on which phase the solar panel inverter is connected?

We have a three phase power supply (3x25A) at our home in The Netherlands (230V). All three phases are used for an induction cooker, and in parallel, two phases (let's call them 1 and 2) each power ...
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38 views

Diagnosing Solar Inverter

The goal is to correctly diagnose from the device's fault codes and determine corrective action. A SB6000U Sunny Boy inverter returns energy into the electric grid: reducing the electric bill ...
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0answers
31 views

Workshop subpanel with possible solar backfeed

Needing to run power from the residence to the workshop. the need is 220v for the welder in addition to overhead lighting, the run is 375'....what wire and conduit size is needed? If in the future, ...
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2answers
73 views

Can I install electric equipment on carpeting?

I am starting to build a 600-watt solar panel system. I have a small workshop, that used to be an office. I am planning to install it there. I plan to install backups, a charge controller in an ...
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3answers
80 views

Is it normal to see moisture inside my solar panels?

They are installed about 10 inches above my sheet metal roof. The solar panels are Monocrystallin.
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2answers
67 views

Will it damage my batteries?

I have two solar arrays which totals close to 2 kw that I use to charge a 24 v 450 amps flooded lead-acid battery bank using 2 mppt charge controller of 30 and 40 amps. Will it damage the battery by ...
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1answer
65 views

Solar panel setup with battery

The electricity where I live is pretty expensive at about almost 30 cents a KWh, so I'm considering setting up a solar system. I got 3 100 Watt Polycrystalline solar panels a while ago, pretty cheap. ...
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1answer
75 views

Proper amount of solar panels needed to charge batteries

I am working on a plan for a 24V electrical system. Based on my needs I plan to have six 12V 100Ah LiFePO4 batteries wired up (2S3P I believe) to give me 24V 300Ah. Assuming I need to fully recharge ...
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1answer
106 views

Solar AC Disconnect - Fused or UnFused?

I'm installing a solar panel system with microinverters on each panel. An AC disconnect must be installed outside. I've learned that AC disconnects can be fused or unfused. - the unfused variety ...
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2answers
231 views

AC Disconnect Ampacity - can fuse size be something other than 30 or 60 Amp?

I am currently hunting for an AC disconnect to sit between my main service panel and the AC power that will be supplied by my solar panel microinverters. Nearly every AC Disconnect I find online is ...
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2answers
77 views

Solar 240 VAC source and load wires sharing a conduit

I'm planning on installing a new electric oven and solar panels on my house soon. Given the location of everything relative to my electrical service panel, both the panels and the oven will need to ...
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1answer
36 views

LED security light adding a switch

I have this LED solar security light. Now I want to put this in the back of a shipping container and I want to have a switch all the way in the front of the shipping container. I have no previous ...
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1answer
120 views

Determining Bus-Bar Rating for PV Installation

I already have a primary PV inverter connected up through a 40A breaker. I'm looking to expand by adding a second PV inverter. To comply with the 2014 NEC 705.12(D)(2) rule I need to know the panel ...
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4answers
174 views

Sizing up a battery bank for max continuous power draw

EDIT: on hold while I check conditions @Harper pointed to the fact that my battery is rated to draw 165A continuously for an hour, which should cover the needs of my inverter when my vacuum starts up....
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1answer
65 views

Will my roof framing support an array of flat solar panels?

I want to install 23 305w panels on my roof. It's a flat roof constructed with 2x8 beams spaced at 24". There is no snow load to consider and we get occasional wind and rain storms a few times per ...
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1answer
135 views

How should I connect my solar panels to each controllers for optimal performance (series or parallel) without buying new charge controlllers?

I have 4 355w solar panels and 3 315 w solar panels. I have a 40 amp mppt and a 30 amp mppt charge controllers with 100v Max pv voltage. The distance solar panels to charge controllers is around 15 ...
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1answer
114 views

My contractor wants to install a different brand of solar panel from what was approved in their permit

I am having solar panels installed on my house. My contractor told me that they are installing 20 Canadian Solar CS3k-325-MS panels. I just got a copy of the plants they sent to the city for their ...
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2answers
145 views

Storing comsumable dry goods in your car in the summer? [closed]

I live in South Florida where the summer sun has no mercy. I drive a new van and I've taken steps to keep the inside cooler during the day. I live in the van for weeks at a time and need to store ...
2
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2answers
76 views

DIY Solar Panel Install

I have a house under construction, and the electricians have installed a 1" conduit from the attic to the main panel. I have also gotten 5 quotes to install a Solar PV system around 9kW. I can ...
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2answers
79 views

Calculating daily energy production of PV panels

From https://www.solarpowerrocks.com/solar-basics/how-much-electricity-does-a-solar-panel-produce/ it says: "Using the example above of a 250-watt STC rated panel, if you multiply the 250 watts the ...
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4answers
352 views

using solar when power grid down, why do I need batteries?

I am considering a home solar photovoltaic installation, probably 5kw or so. The usual configuration around here is with a grid-connected inverter and net metering. But when the grid goes down, the ...
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2answers
70 views

How to calculate wattage used in a solar panel set-up

I want to run an electronic that uses 300 watts @ 5-10 amps via solar panel's on my rv. I've got (2) 6 volt batteries set up in a series so it is 12 volts. Here are the stats for one battery (so I ...
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6answers
5k views

Is Electric Central Heating worth it if using Solar Panels?

I understand that electric heating is less efficient and comparatively more expensive than gas heating (propane or natural gas), but considering I live in Texas (a lot of sunlight) and I intend to ...
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2answers
2k views

Is it safe to harvest rainwater that fell on solar panels?

I am working on creating blueprints for my new home. My plan is to have both solar panels on the roof and a rainwater catchment system that directs water from the roof into some tanks in the basement. ...
2
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1answer
56 views

Comparing mixed orientation solar panels to non-mixed on a Brooklyn Solar install

I'm looking for advice on choosing from two solar panel proposals. I have a historic landmark brownstone in Brooklyn with a flat roof and am looking for the most power that I can fit into the roof ...
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2answers
156 views

Solar panel as a hatch and Is sleeping under a solar panel safe?

I'm looking to build a very large custom roof hatch/vent on my van. I was going to make to top out of Lexan, but then I realized I might want a large solar panel on the roof as well. I was looking at ...
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2answers
60 views

Solar powered water pump

I have really low water pressure in my home at about 15 PSI and sometimes even 0. I already have a check valve on my main 3/4" line from the water meter. Since electricity is pretty expensive where I ...
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2answers
55 views

simple 12 volt heater

I have a small shed and a few extra solar panels (about 400 watts worth). It's a cold area and I'd like to just convert the electricity to heat. I thought maybe a dummy load would work. Basically I'm ...
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0answers
66 views

Connecting house battery to starter battery - cable sizing considering alternator?

I have a heavy duty 6 ton truck with 24 volt start batteries. I am building a house battery system, also 24 volts. I want to connect the house battery to the car battery with a switch, so that I can ...
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2answers
54 views

Status of solar-powered landscaping lights [closed]

As of now (9/2018), are solar-powered landscaping lights a sensible option? In 5-year intervals, for the past 15 years, I've been suckered into buying solar-powered landscaping lights and every time ...
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0answers
50 views

Solar panel not charging battery

I have a small PV system for my shed. Just setting up and testing at this point. 90W panel MPPT T20 charge controller - 20 AMP 120ah 12 volt battery Only one led light connected to load. I am not ...
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2answers
82 views

Any ideas for how to use solar to offset electricity in an apartment? [closed]

I have 2 solar panels and a deck that is east and south facing, so it gets plenty of sun. I've been trying to see if there's a way to use those to help offset electricity in an apartment. Any ideas ...
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1answer
912 views

Do I need to feed a subpanel with a breaker, or can I use subfeed lugs?

I am feeding a subpanel from a main panel, and the subpanel will have a main breaker installed. Do I need to feed the subpanel from a breaker in the main panel, or can I use subfeed lugs? I ...
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1answer
706 views

Are blocking diodes necessary for solar panels

In a residential solar array, bypass diodes are used when panels are in series to prevent a shaded panel from effectively becoming a large resistor. Blocking diodes prevent current from going back ...
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2answers
92 views

Solar for particular electronic equipment

I am living in a rental house. Earlier i had an idea to install solar panel for whole house but the cost is very high and other problem is if i am going to shift the house I want to move solar ...
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0answers
140 views

How to bring solar panel wires inside house?

I have a pretty simple solar panel setup in the backyard which links to the charge controller to the batteries. I wanted to run wires inside the house so I can use it for smaller stuff like charging ...
0
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1answer
62 views

How to calculate theoretical long-term projected savings for a DIY solar powered fridge? [closed]

I went on energystar [dot] gov and used their product finder to find the lowest "annual energy use" compact refrigerator. For my use, that turned out to be the FURRION - FCR43ACA-BL which has an ...
3
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1answer
738 views

Is there a type of interlock (transfer switch) that can be used for a generator OR solar panels?

For a new house, I've decided to install two breaker panels, one for critical loads like the well pump, lights, refrigerator and certain outlets, and a second for heavy and non-critical items like the ...
2
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3answers
1k views

Is a 240v solar panel setup better than 120v?

I am considering a small 1kW solar system (4x 250-watt panels). The seller offers them in both 120v and 240v configurations with "micro-inverters". Given a 25-year panel warranty, could the amperage ...
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2answers
1k views

Identifying and crimping 2-pin connector

What are these plastic connectors? They’re female and male counterparts. One has male pins and the other has female metal square-holed pin receptacles. What are these called? Here’s a side view and ...
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0answers
35 views

Using excess energy during float phase - am I using up my batteries' cycle life?

I have a hybrid power system: 3kW solar; 2kW wind turbine; 1kW water wheel, that feed a 48v (flooded lead acid) battery bank. Presently, after absorption charging is complete and the system goes into ...
2
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1answer
679 views

Charging a battery with a solar panel

I want to light a cabin. I have the following: 75w 12V Coleman solar panel (two bare wire ends) Large car battery from a Jeep Even larger (boat?) battery - an Optima Yellowtop 34/78 50/10/2A 12V ...
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2answers
1k views

Multiple grid-tie (non-micro) inverters

This is a question that just occurred to me. Assume you have multiple grid-tie solar PV inverters connected to your home load center. What would happen if, while in operation, you were to open the ...
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2answers
100 views

How does a roof replacement impact recommended timing of solar panel installation?

I just found out that I should replace my (currently asphalt shingle) roof in the next year. I am also interested in evaluating the feasibility of installing photovoltaic and/or solar hot water panels....
1
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4answers
210 views

Is Having Multiple Charge Controllers on a single 48V System/Battery Bank a “Bad Idea”?

I have a 48-volt renewable energy power system in my house that is presently off-grid. It has: - a 6kVA inverter/charger that can connect to a generator or the grid (charge controller #1) - a 2kVA ...
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0answers
48 views

Combining a solar collector with photovoltaics

Our house has 10 solar collector panels, each 1 by 2 meters, installed around 20 years ago. By now their polycarbonate covers are breaking down due to the elements, and we've thought about the ...