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17 votes

UPS / Battery Question

I think you're seriously looking for trouble if you try to use one set of batteries in two UPSes at the same time. In theory, discharge will be OK - the batteries will be supplying both loads at the ...
manassehkatz-Moving 2 Codidact's user avatar
6 votes

Grounding rod conflicts with circuit tester

The symptoms are indicative of not having a neutral/ground bond in place, (or not having a ground wire connected in the receptacle, to be complete) but at the present level of detail it's hard to know ...
Ecnerwal's user avatar
  • 220k
4 votes

UPS / Battery Question

The units use two 12v 8AH SLA batteries in series and for what they cost to replace I could almost replace the entire UPS units. I live in Hawaii so the shipping cost of lead acid batteries is often ...
Harper - Reinstate Monica's user avatar
4 votes

Proper way to extend circuits to subpanel

Using the existing big conduit is cheapest and easiest. A couple of 50 ft reels of wire (black and white) and a box of wagos and a couple of hours. It leaves the left panel a bit crowded with wires ...
jay613's user avatar
  • 40.3k
3 votes

Proper way to extend circuits to subpanel

You can add accessory ground bars all day - that's not a problem. The panel labeling will list models for which the panel is pre-drilled. If your neutral+ground bar on the main panel is full, ...
Harper - Reinstate Monica's user avatar
3 votes

Grounding rod conflicts with circuit tester

I know that ground rods appear controversial in solar circles, and some say you don’t need them Are those people licensed electricians? Do they sit on any NEC code writing panels? I didn't think so. ...
Harper - Reinstate Monica's user avatar
3 votes

Has a new panel outside the house made my main house panel a subpanel?

Not necessarily. NEC 2020 imposes a requirement for outside disconnects for fireman's use (since pulling a meter off a live building is fraught with arc flash risk). This is in 230.70. Almost always, ...
Harper - Reinstate Monica's user avatar
3 votes

Has a new panel outside the house made my main house panel a subpanel?

Yes, that is a code violation and the solar company should have fixed it, and the inspector should have caught it. But companies doing these installations are typically on fixed-price contracts. So, ...
manassehkatz-Moving 2 Codidact's user avatar
2 votes

Help understanding grid tie inverters with limiters

A faulty concept Here's the problem. Conceptually, you believe that your house draws a large amount of power continuously... or you haven't really thought about it and assume ??? happens in your favor....
Harper - Reinstate Monica's user avatar
2 votes

GFCI test failure

Unlikely that you have 2 bad GFCI/breaker and 6 bad GFCI/receptacle devices. Which leaves two possibilities: Your tester is bad. Unusual, but anything electronic can break, and that would fit with ...
manassehkatz-Moving 2 Codidact's user avatar
2 votes

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

guys i've finally found it locally.. thank you for those who helped! it cost about $2.50
Christian Burgos's user avatar
2 votes

Proper way to extend circuits to subpanel

Cables/Extensions A breaker panel box is a junction box. So you have 3 options, depending on how much excess cable you have and the direction each cable is coming from to get into the main panel. The ...
manassehkatz-Moving 2 Codidact's user avatar
1 vote

solar panel cracks, are they affecting output?

If you have reporting at the microinverter level, at a time when the whole array is in sun, compare the outputs of the different panels. You could also look at historical data, where there's an ...
Ecnerwal's user avatar
  • 220k
1 vote
Accepted

Solar wiring and code requirements

It depends on what wiring you are talking about. If its unprocessed voltage form the solar panels, then no. You need to spec the panels and then calculate what voltage/current you will generate. If ...
Rohit Gupta's user avatar
  • 6,538
1 vote

200A Upgrade Main Panel Requirements

You must start with your utility to determine which types/models of meter main/panels are allowed. For a separate main panel from meter main, the meter main is the utility's choice and the "main&...
manassehkatz-Moving 2 Codidact's user avatar
1 vote
Accepted

What is the best option for remote enabling generator for solar system?

Get a generator with a two-wire start interface The thing you're looking for on a generator to enable it to work with your inverter for remote/automatic start is a "two-wire start interface"....
ThreePhaseEel's user avatar
1 vote

MSP Busbar rating and Max branch circuit breaker for PV solar on Sq.D Meter mains CSED SC816D200C series 2

Unless they've changed the multiplication tables, 7.5 kW solar divided by 240V is only 31.3 amps. This is a solar-ready HOM ranch/trailer panel (Meter + main + 8 breaker spaces + thru lugs), and "...
Harper - Reinstate Monica's user avatar
1 vote

Proper torque specs and cleaning busbar and lug connections

For copper, cleaning is not that crucial. Alcohol is just fine, as it removes fat. So is any other solvent that removes fat. In general I've never cleaned mating surfaces unless there's visible dirt. ...
vidarlo's user avatar
  • 1,960
1 vote

How do I properly ground a 12V off-grid solar system?

Firstly, you have to make absolutely sure that your equipment is designed for negative ground. Some solar equipment is designed for positive ground systems (it's cheaper, more efficient, and more ...
david's user avatar
  • 169
1 vote

Help understanding grid tie inverters with limiters

Whether or not your power company will ever see a momentary export depends on what sort of meter you have. Unless it's actually set up to measure export, they will never know. The inverter has a ...
Simon B's user avatar
  • 3,958
1 vote

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

Quite simple; the screws should be in the rafters. Look at the size of the screws and the thickness of the decking which is normally only 5/16”. It is the lifting force of the panels by strong wind ...
Peter van Dijk's user avatar
1 vote

Is it possible to make a heliostat with no moving parts?

I just found a design of static heliostat by "Solight", even funded by Europe: This project has received funding from the European Union’s Horizon 2020 research and innovation programme ...
jumpjack's user avatar
  • 121
1 vote

Is it possible to make a heliostat with no moving parts?

This amazing free tool allows experimenting with any combination and shape of mirrors and lens: https://phydemo.app/ray-optics/simulator/ I am experimenting with parabolic mirros, circular mirros, ...
jumpjack's user avatar
  • 121

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