Questions tagged [solar-panels]

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

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57 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
63 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
48 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
54 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
56 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
33 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
62 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
114 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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0answers
28 views

How should I connect my solar panels to each controllers for optimal performance (series or parallel)? [duplicate]

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
61 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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2answers
106 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
106 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
143 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 ...
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2answers
66 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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1answer
58 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
315 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
58 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
4k 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
1k 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. ...
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1answer
50 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 ...
2
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1answer
88 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
56 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
54 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
60 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
53 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
49 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
600 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
552 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
65 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
85 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 ...
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1answer
58 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 ...
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1answer
643 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 ...
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3answers
906 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
590 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 ...
3
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2answers
824 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....
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4answers
201 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 ...
2
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0answers
47 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 ...
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3answers
223 views

How can I economically switch between two home power sources?

We're researching low cost solar power systems, and we stumbled across a company out of Tx, offering a system that allows you to switch individual circuits between your service lines and solar. Sounds ...
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2answers
111 views

Will this solar panel setup work?

Fairly new to using solar. I have been reading up on volts vs. amps in terms of what makes the most efficient system. I am considering a 24v battery bank with 4 12v batteries connected together. These ...
30
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13answers
8k views

Protecting solar panels from kids who may throw stones to get monkeys off roof

I have read this question - Solar panels and hail and my question is similar. I have the possibility that neighboring kids may throw stones at my roof top solar panels to scare off monkeys which are a ...
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2answers
169 views

Will this solar charger work with my solar panel setup?

I recently bought some used solar panels that are about 25 years old, because I got a great deal on them. They have some odd operating values, which is confusing me as to which solar charger will work ...
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1answer
1k views

Can I connect a battery reserve to my solar attic fan?

I have recently purchased a solar powered gable fan for my attic. This fan will only work when the sun is up, but I would like a little more out of it during the early evening hours (no sun). Is ...
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7answers
6k views

Heat large pool with electric via solar panels?

Where might I go for help with this? Should I try to price it out myself or find a contractor? What type of contractor should I look for? My community of 60 families owns a pool. It is about 30' x ...
3
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4answers
9k views

How to connect power inverter to standard lighting circuit

I'm interested in installing a solar power system in my garage and am wondering how to connect the three-prong receptacle output of the power inverter to a NM-B lighting circuit that was previously ...
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3answers
115 views

Can I put a PV panel on my roof and run wires into a room to a power resistor to generate heat?

Maybe a dumb idea, but can I just put a PV panel on my roof and run wires into a room to a power resistor to generate heat? I have just one room that I was thinking of adding this additional heat to. ...
2
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2answers
915 views

Solar panels and batteries as primary, grid as backup with auto transfer switch [closed]

I've been toying around with this idea and I'm not sure if it's feasible. I live in an area where the power company has recently adjusted rates to make grid-tied net metering rooftop solar ...