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35 votes

Heat large pool with electric via solar panels?

PV panels are ~15% efficient. Hot water panels are much more, and probably much cheaper. Way more efficient to just heat the water, rather than convert to electric and then to heat. Maybe with the ...
SomeoneSomewhereSupportsMonica's user avatar
28 votes

Is Electric Central Heating worth it if using Solar Panels?

Passive solar design before you build On a new build, your very first stop is passive solar design. Strutting forward and designing a bad old stickhouse, and then bolting on solar as an afterthought,...
Harper - Reinstate Monica's user avatar
20 votes

Why do I need batteries to use solar when the grid is down?

This is an XY problem at the industry level. Imagine some guy says "Design me a dimmer" and you design him an excellent triac dimmer, no big. And then he goes "Cool, can you just tack on a VFD onto ...
Harper - Reinstate Monica's user avatar
18 votes

Is Electric Central Heating worth it if using Solar Panels?

Assuming that you are (a) on the regular electric utility grid and (b) are on the regular natural gas delivery system (i.e., don't require propane deliveries), as a general rule, natural gas heating ...
manassehkatz-Moving 2 Codidact's user avatar
16 votes
Accepted

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

The real problem is the monkeys. The collateral damage due to flying rocks would best be dealt with by trapping and relocating the monkeys. Or, it might be helpful to use an electric (chicken wire) ...
Ben Welborn's user avatar
  • 6,212
14 votes

Solar-electric system not generating rated power

Solar panel rating is based on absolutely ideal conditions. Absolutely ideal. In order to get those conditions you need to have a perfectly clear day, freshly cleaned panels, your panels mounted on a ...
Harper - Reinstate Monica's user avatar
13 votes

Heat large pool with electric via solar panels?

This has already been said in one answer - but I want to say it again so that it is very clear. Generating electricity from solar only to then turn around and run electric heaters for the pool is not ...
Michael Karas's user avatar
  • 65.2k
12 votes

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

I live in a small Himalayan Village facing the same problem. But we kept our solar panel in such a place which is not accessible to kids or monkeys. The second thing I would like to mention is that ...
J.P.Maithani's user avatar
12 votes

Is Electric Central Heating worth it if using Solar Panels?

If you design the solar thermal correctly, then given the annual solar insolation ( higher than my location in EU by about a factor of 2) then with good insulation you can avoid heating at all. But ...
Solar Mike's user avatar
  • 27.8k
11 votes

Heat large pool with electric via solar panels?

How much energy do you need? In four months you spend $7500, so assuming you heat using natural gas, that would indicate a consumption of about 19,000 cubic meters. At 10.8 kWh per cubic meter, we're ...
LSerni's user avatar
  • 287
10 votes

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

If you plan to use that collected water for drinking and cooking then you will need a proper filtration / treatment system... Ingesting diluted bird-droppings is not a good idea... So, a simple ...
Solar Mike's user avatar
  • 27.8k
8 votes

Heat large pool with electric via solar panels?

You have a pretty big pool by residential standards but I still am surprised it is costing you that much... almost $2k per month! Assuming a price of $.90 / therm (average in the NY area, according ...
Hank's user avatar
  • 14.1k
8 votes
Accepted

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

Welcome to the land of Article 220 The procedure you're describing for determining the appropriate amperage rating of subpanel and feeder is called a load calculation, and is performed using a set of ...
ThreePhaseEel's user avatar
6 votes

Why do I need batteries to use solar when the grid is down?

The batteries are a "buffer" Solar panel output inherently varies with a variety of factors, even when the sun is out: temperature, shading from obstacles, incidence angle, and more. As a result, any ...
ThreePhaseEel's user avatar
6 votes
Accepted

Solar AC Disconnect - Fused or UnFused?

You don't need a fuse here The solar disconnect is only needed so the utility can shut down your solar system if it goes awry without having to fumble around in your breaker box or incur the risks of ...
ThreePhaseEel's user avatar
6 votes
Accepted

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

There are 3 basic types of alternative energy installations: Grid-tied Off-grid Hybrid What you have is grid-tied which is absolutely required to shutdown within just a few milliseconds in the event ...
jwh20's user avatar
  • 23.4k
6 votes

how to charge marine battery at my wall

12 volt battery charger, sold in any place that sells batteries.
crip659's user avatar
  • 25.7k
5 votes

What is required to connect solar panels to my home without connecting to the grid?

In stark contrast to some statements seen here, in parts of Europe it is a big trend even for non-electricians to put 1 or 2 photovoltaic modules to the balcony or elsewhere with an on- grid ...
xeeka's user avatar
  • 2,562
5 votes

Is Electric Central Heating worth it if using Solar Panels?

Start with efficiency Harper's overall point about starting with an efficient envelope is dead-on; managing solar gains is going to be a huge part of it down in Texas, and you'll also need to be ...
ThreePhaseEel's user avatar
5 votes

Why do I need batteries to use solar when the grid is down?

Because even when it isn't dark, there may be clouds. The amount of power you can get from solar panels depends enormously on the amount of sunlight hitting them. My rough rule-of-thumb is that ...
Simon B's user avatar
  • 3,958
5 votes

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

The issue, overall, is transfer architecture The idea of a "universal transfer switch" per se doesn't exist, at least not in the turn-key form you're after. Why? The issue is that ...
ThreePhaseEel's user avatar
5 votes
Accepted

How much solar can I get, and when/why would it require digging up the street?

You have 125A busses, so you don't need to replace your meter-main just to fit solar As your loadcenter's labeling states, the busbars in the loadcenter are rated for 125A. Applying the 120% rule ...
ThreePhaseEel's user avatar
5 votes
Accepted

What is a "solar-ready" air conditioner?

You paid a higher cost to have an AC with the built-in breaker circuit to handle the output from a small solar system. The built-in breaker limits the size of the solar system that you can install ...
Programmer66's user avatar
  • 2,752
5 votes
Accepted

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

As to your direct questions, Is this a valid and code-compliant configuration for safe, utility compliant net metering ? Have I described anything (other than the car hookup) that doesn't work the ...
Harper - Reinstate Monica's user avatar
5 votes

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

Here's the problem. Virtually all products are built on the assumption that they will be run on utility mains AC power. That assumption permits economies in design: There is no need to "...
Harper - Reinstate Monica's user avatar
5 votes
Accepted

Residential Solar Stopped Working

Your system sounds very similar to mine. The YC600 has blinking lights underneath. Are yours blinking red? Is it slow blink or fast blink? My system stopped working - I think I had slow blink red. ...
Fresh Codemonger's user avatar
5 votes

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

This is a 100A bussed panel I can tell that this is a 100A bussed panel because it only has a single rating for both main breaker and busbars, namely 100A. A panel that could take either 100A or 125A ...
ThreePhaseEel's user avatar
5 votes

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

First, if first-floor flooding is something you need to think about, absolutely forget about using AC power unless your entire service is set up for that to work. Your service drop must be overhead ...
Harper - Reinstate Monica's user avatar
5 votes

Solar-electric system not generating rated power

It is possible, even likely, that you may get more times of 3.2KW output (and thus, greater total output for a month) on suboptimal days with 410W panels than you would with 330W panels, but it's ...
Ecnerwal's user avatar
  • 220k
5 votes
Accepted

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

The word you may be looking for isn't "relay" but "contactor". These are more often used for switching mains, but definitely exist to switch high DC currents. Note that when ...
Chris H's user avatar
  • 6,701

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