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The De'Longhi Pinguino air conditioners offer the maximum in terms of power, efficiency and design.
Furthermore, De'Longhi is the only ambassador in the world to manufacture "water-to-air" conditioners, which are different from the standard "air-to-air" ones because they use water to maximize the cooling effect. Pinguino Inverter Water-to-Air is the combination of the power of water-to-air technology and the efficiency of the DC Inverter compressor.
DC Inverter technology has been designed to offer the best comfort with optimised energy consumption. This technology is based on an electronic device that allows frequency variations of the electric motor, to adjust the rotation speed of the compressor and obtain a modulation of the cooling power. This device eliminates the sequence of On–Off required by conventional air conditioners to keep a fixed room temperature, with consequential high temperature fluctuations around the set temperature and longer time gaps before it is reached. The Pinguino Inverter always operates at the optimum cooling capacity and the maximum energy efficiency as the energy consumption is automatically restricted to what is actually needed, by adapting to varying external temperatures, both in periods of average and low thermal load (morning or evening), and during the hotter and more humid times (middle of the day), when the Inverter technology is especially valuable.
Thanks to the extremely high cooling power, Pinguino Inverter quickly reaches the desired temperature and keeps it constant over time. Look for a generator that includes electric start and a panel switch that internally reconfigures the generation coils to provide full output at either 240 or 120 V — common on higher-quality portable generators. This Onan RS20000, 20 kW LP generator is a perfect match for four OutBack VFX3648 inverters (see next photo).
Inverter–generators, like this Honda EU6500is, can adjust engine rpm to meet loads while an onboard inverter keeps the output waveform on spec. An autotransformer can convert 240 V output from a generator to 120 V needed by an inverter’s charger.
BeginnerUnless you have a good hydro or dependable wind source, or an excessively large PV system, sometimes the only way to keep your off-grid power system operating is by using an engine generator. The first is backup charging, where the generator makes up for any deficit in energy from the solar array or wind turbine, since the generator will work in any weather. The third role is to run specific loads that exceed the capacity of the inverter(s), such as 240-volt deep-well pumps, stationary shop tools, and even air conditioners.
Ask yourself: Is a breakdown just an annoyance or will it completely disable my home’s power system?
For off-grid backup, your choice will constitute a compromise between application, cost, availability, and support. Electric start with two-wire remote start capability: “Two-wire” means all starting control functions (such as cranking and crank duration) are handled within the generator, rather than externally.
No or minimal standby load: Some generators, designed primarily for on-grid standby use, draw energy—even when not running—for control functions, charging the starter battery, and even for block-heating in cold climates. Engine speed: In general, quality conventional generators run at lower speeds—typically 1,800 rpm versus 3,600 rpm—which directly translates into longer life.
Generators are fueled by gasoline, propane (or its cousin, natural gas), diesel, or biodiesel. With some notable exceptions, diesel generators are typically long-lived and high-quality—and relatively expensive. As a general rule, a generator should be able to supply the full charging capacity of your inverter, plus loads that typically run while charging and provide some reserve capacity. Often, a generator is purchased before the power system is designed, as an early source of power for construction and water supply. Most PV arrays for off-grid homes will be sized to meet or exceed design loads for part of the year. Because arrays and batteries are sized to different purposes, the array is seldom large enough to meet even the minimum C-rate needed to routinely fully charge and regularly overcharge (equalize) the battery bank.
Straight 120 V: Many of the newer “inverter-generators” (see below), and most models designed for RVs, put out power only at 120 V. Most inverters manufactured since the late 1980s can only receive 120 V input from a generator. This means that the less-expensive generators are least able to efficiently back up the most common inverters. One solution is to use a balancing autotransformer to step down the 240 volts to 120 V before sending it to the inverter.
Generator models are rapidly evolving, with new models entering the market and old favorites being discontinued. The safest bet is to buy a well-respected brand, or at least a generator that comes with a brand-name engine—it will be much easier to find parts and service for a well-established brand than for some no-name model. Among conventional portable units 6 kW or less, Honda’s EM or EB, and Yamaha’s EF and YG series have been well regarded for years. In higher-quality commercial units, Kohler’s 10ERG is a well-regarded model developed for the RV market and adaptable for off-grid use.
Notable negative comments have generally been directed at the cheapest generators, with poor waveforms, inflated output claims, and lack of long-term reliability. I had been looking for a whole-house AC utility monitor to track my utility electricity consumption beyond what I produce with my PV system. The best way to reduce our energy usage is not use it in the first place—conservation, conservation, conservation. Yes, noise is an unavoidable problem with any engine-generator, and none are as quiet as a whisper (or mouse).
Unfortunately here at Gold Coast Power Solutions we have seen the “Relay Check Fail” message many timers on Eversolar solar inverters. An Eversolar inverter working properly should display a green light and should not have the red light lit. If you are experiencing this issue in your Eversolar solar inverters, you’ll need to do something about it ASAP as your inverter is currently not working. If the inverter is still within the 5-year warranty and you have proof of purchase documentation then Eversolar should cover this issue under warranty. Just take note though that Eversolar tends to take a while to service warranty claims, usually you will be waiting a month or so. If your inverter is out of warranty or you’re not prepared to wait for the unit to get fixed, the next best option is to have the inverter replaced with a good quality unit with a full factory warranty. If you need any further assistance with your Eversolar Solar Inverter Relay Check Fail issue, just complete the form on this page with your details so our team can provide you with further assistance. Click here to get your solar power system back saving you money rather than costing you money!

The inverter features an AC pass-through circuit, powering your home appliances from utility or generator power while charging the battery. It features power factor correction, sophisticated multi-stage charging and pure sine wave output with unprecedentedly high surge capability to meet demanding power needs of inductive loads without endangering the equipment. But many residential generators are poorly matched to the job, since the selection and purchase of a generator is often an afterthought. All flooded batteries need to be overcharged several times each year for best service life and performance.
Even in a well-designed off-grid power system, the generator is likely to be the single greatest source of maintenance and aggravation. The least-expensive units are designed for occasional homeowner use with power tools or cement mixers, for instance. Remote start capability means that the start and stop signals can be sent from an inverter or other controller.
An 1,800 rpm unit will also operate more quietly, with less vibration and lower fuel usage.
Generators designed for on-grid “residential standby” operation sometimes require an external battery charger. Liquid-cooled machines will run quieter and, being thermo­statically controlled, will run at a more even temperature year-round, resulting in longer life. Quality generators allow the neutral conductor to either connect to the generator chassis (for prime power application) or remain separate from it.
The least expensive generators and nearly all portable units use gasoline, which offers some advantages­—mainly that gasoline is familiar and manageable by the unskilled user. Many off-grid homes already have an LP tank and lines for cooking and heating, so the fuel is convenient and relatively safe. However, the fuel is best suited to warmer climates, as it gels below freezing temperatures. This both minimizes runtime and maximizes C-rate—the charge rate necessary for good battery care.
The result is that the RE system designer must take the existing generator and adapt the system design to best use it—a backward approach to system design. This seasonal duration may cover all except the heart of winter in the sunny Southwest, or may only cover half of the year in northern climes.
Hence the need for the generator, which can add the necessary charge current to get this done, and may be even the only contributing charging source during winter—so it should be sized to handle the job. If you look inside a home’s electrical distribution panel, you will see three non-ground wires coming in: two “hot” conductors and one “neutral” conductor. Small, portable units (less than 2,000 watts, generally too small to use effectively as charging sources) are only 120 V. For most off-grid homes, this is not a problem, since 240 V loads are typically large bulk loads from water heaters, clothes dryers or electric ranges that are inappropriate in an off-grid home. The inverter (which cannot substitute for the RE system’s inverter) is an integral part of the generator, electronically synthesizing the voltage, current, and waveform, while maintaining full-peak voltage up through their maximum load. Most of the reliable, small generators of years past were made obsolete by California’s emissions standards and changing markets.
Finding a high-quality used machine with low hours and evidence of proper care may also be a possibility. Multi-Quip and Robin—made by Fuji Heavy Industries and marketed under the Subaru, Makita, and Baldor names—also have solid reputations. Onan makes several adaptable units, including the RV QG 6500LP, RS 12000, and RS 20000 LP, the latter two suited to larger systems. Also, avoid knockoffs of well-known models, especially low-cost inverter-generators now on the market.
My cabin (soon to be house) is currently powered by a 20kw Onan propane generator connected the main AC panel.
Having a good generator is all very well, but the experience can be spoiled by the neighbors throwing rotten vegetables at you every morning because your $%^& generator keeps them up at night. From the manufacturers claims, all generators are "whisper quiet", and you would be more likely to be disturbed by a mouse tripping over a pillow.
In a residential application the system needs to be configured so there is no possibility of the batteryless grid-tied (GT) inverter trying to synch with the engine generator. If you wish to take this option, you will need to present the proof of purchase of when it was originally installed.
This pure sine wave inverter and power-factor corrected charger provides clean, reliable inverter power with a total harmonic distortion of less than 5%.
Ruggedly marinized for corrosion protection in the salt water environment, the MS Series includes conformal coated circuit boards, an aluminum powdercoated chassis and top and stainless fasteners. When utility power fails, the battery backup system keeps your appliances powered until utility power is restored. The overload capacity is 300% of continuous output for up to 20 seconds to reliably support tools and equipment longer.
We need styles that are quick and easy to maintain without having to wake up at the break of dawn every morning to get it right. The result is the generator becoming the weak link in the system, with inefficient, unreliable performance, rather than being an integral component of a well-functioning system. Equalizing is the deliberate overcharge of an already-full battery—raising the battery voltage to a higher-than-normal voltage (as specified by the battery manufacturer) and keeping it there for 2 to 3 hours.
It’s a mechanical device, rather than electrical, so it requires regular maintenance and will eventually break down—usually when it’s most needed. Consider also that unless you are prepared to maintain and repair the machine yourself, you will need reliable local support when the eventual failure occurs. Look for a generator that has no parasitic draw when off, or expect to add a separate small PV module and charge controller to keep the starting battery charged. Portable generators are seldom properly grounded, so manufacturers ground the neutral output conductor to the chassis. The drawback to diesel fuel is that, compared to natural gas or propane, it’s a “dirtier” fuel, producing more pollution. Generators used in home systems will vary between about 2,500 watts and 20 kilowatts of continuous rated power.
Battery banks are typically sized to provide two to four days of autonomy (time the batteries can supply energy without further charging), depending on the seasonal climate and other factors.

The voltage between each hot and the neutral conductor is 120 V, and the voltage between the two hot legs is 240 V.
The rated output is the combined wattage of both 120 V legs, and at most, half of the rated output is available at 120 V.
Second, the load on the generator is unbalanced, with one 120 V leg fully loaded and the other unloaded. However, a typical autotransformer for this purpose retails for more than $500, making the “low-priced” generator much more expensive.
As the 60-hertz AC waveform is not dependent on engine speed, the engine speed varies according to the load. Newer models have been developed primarily for the on-grid home standby market, rather than for stand-alone use. Consider also an inverter–generator, as these are gaining wide acceptance, with sizes available up to 6.5 kW. Your inverter will now power your home, so it's output should take the place of the generator. But I strongly suggest that you hire an electrician experienced in off-grid systems to handle all the wiring. As I'm sure you are well aware there is some good info on the web and some "confusing" info, that's why I posted the question here, a reliable source that I only recently found. But if you are in town, how about offering to power their fridge for a few hours a day during any blackouts?
And if not configured correctly, yes there could be problems with a GT inverter trying to backfeed a generator (likely causing damage to generator) if the inveters's strict power tolerances were actually met with the inverter output exceeding the household loads.
This will keep going on and on, you will also notice that the the red LED light is lit, which means that the inverter has detected a fault. Internal protection circuits prevent over-discharge of the batteries by shutting down the inverter when a low battery condition occurs. With it's 500 watt power output, this power inverter can easily handle most DIY tools without the need for long trailing cables when working away from the house. They’re designed to be worked hard and then written off as a business expense when they die.
When connected into a grounded power system, however, this presents a safety hazard, as the neutral is now bonded to the ground at two places—one in the power system AC (such as in the main AC service panel) and one in the generator—and the safety ground wire becomes current-carrying. Allowed to sit in a generator’s fuel tank, gasoline will eventually deteriorate, leading to clogged orifices and preventing the generator from starting when needed. Similar to the way an inverter’s continuous-duty capacity is compared to its capacity to meet larger surges, “rated” output is the level of power a generator can deliver continuously. These units are able to use both 120 V legs of a generator to provide balanced charging from both hot legs.
Standby models, intended for backup power during utility outages, are marketed as low-maintenance home appliances. Will I need to rewire the generator directly to the inverter or logically can I leave it on the main AC panel? However from my understanding a solution is to connect the GT inverter output to the grid upstream of the automatic transfer switch, so that the GT inverter would have no pathway to the generator and vice versa.
The transfer relay shifts power automatically in 16 milliseconds whenever shore power is lost, preventing crashes from damaging sensitive electronics. When utility or generator power is restored, the inverter transfers to the AC source and recharges the batteries.
Most off-grid PV arrays aren’t powerful enough to accomplish this, especially during the winter, so a generator becomes an essential tool to achieve this. Some units also include AC ground-fault protection, which is incompatible with connection to a grounded power system. Natural gas and propane burn cleaner than gasoline and diesel, and wear on internal engine parts is reduced. For the eco-tinkerer, diesel units may also be run on biodiesel or either virgin or waste vegetable oil, taking the appeal of “living on renewable energy” to a greater level. Usually, it’s about 85% of the “maximum” power, although some lower-quality generators are not even capable of their “rated” capacity. They will commonly require utility power to maintain controls and charge the starting battery, and even for running block and intake heaters in cold weather—all unacceptable loads in off-grid use. All run on gasoline, but some of these brands may be converted to LP gas without voiding manufacturers’ warranties. Also if you're often on the road, you can finally use your laptop in the car without worrying about running out of juice. Vegetable-based fuels don’t generally need additives to prevent gelling; the fuel is heated instead. In addition, fierce competition in this market has encouraged an emphasis on low price over high quality. Finally, the USB port provided allows you to charge your cell phone or other portable electronic devices on the go. The safest noncompliant approach is to bundle an insulated, green ground conductor with the power conductors between the generator and the main ground bus, which serves to ground the chassis and minimize shock potential. A gasoline generator may be best suited to applications where it is only used occasionally and the gasoline is drained (or run out) after each use. First, check the rating carefully: the 5,500 W rating is likely to be around 4,700 W in continuous duty, such as battery charging through an inverter.
There is a clear and unmet need for simple, reliable, commercial-grade generators not designed for the residential standby market.
Second, the continuous rated power is available only at 240 V, so a single 120 V inverter can only access half of this output capacity, or 2,350 W. The built-in fan keeps the product cool and safe to use even if you use it for hours on the road.
Reply BILL on April 10, 2013 at 8:32 am This is exactly what I need out here in the boondocks.

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