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Rv > Solar/invertors > Flashcards

Solar/invertors Flashcards

1
Q

What are the three types of investors?

A

True sine wave
Modified sine wave
Square sine wave

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2
Q

Which inverter is the closest to an actual AC sine wave?

A

True sine wave inverters

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3
Q

How does a true sine wave inverter work?

A

Uses transistors that switch very rapidly.

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4
Q

How is the modified sine wave produced?

A

It’s produced by introducing an “off” time between the alternating polarities

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5
Q

How are the inverters sized?

A

Sized to the customers AC load demands

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6
Q

What is the minimum an inverter can be sized to

A

Sized to the demand from the largest single AC load

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7
Q

What’s the maximum recommended battery cable run for a large inverter?

A

10’ max combined power and ground

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8
Q

What two things need to be isolated during inverter operation?

A

The DC converter and the fridge

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9
Q

What should be the circuit protection be for the inverter

A

200-400amp dude

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10
Q

Where should the control panel be installed?

A

Should be installed in a protected location that is convenient for the customer to access

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11
Q

What is the efficiency of the newer inverters?

A

90%

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12
Q

How many amp/hrs should the battery bank be capable of supplying?

A

Twice the calculated amount/hrs

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13
Q

What is the common gassing point of a deap cycle wet cell battery?

A

At 25C the gassing point is about 14V

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14
Q

What happens when a wet cell battery isn’t brought to it gassing point during charging?

A

The surface is left on the plates and deterioration of the battery begins

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15
Q

True or false?

All batteries should be brought up to their gassing point to properly charge?

A

FALSE!

AGM and GEL cell batteries must not be charged to their gassing point as it will be harmful to the battery

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16
Q

How do you charge an AGM or GEL cell battery?

A

With a lower bulk charge voltage and a higher float voltage than a wet cell battery

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17
Q

What are the 4 stages of a multi-stage charging system?

A

Bulk
Equalization
Absorption
Float

18
Q

What is a BULK charge?

A

A charge that gets as much current into the battery as fast as possible without damaging the battery

19
Q

What is the ABSORPTION charge?

A

Where voltage stays at 14.5V but current will slowly drop as the battery resistance increases

20
Q

What is the FLOAT charge?

A

This stage will keep the battery “full” but prevent gassing

21
Q

What is the basic purpose of a solar charging system?

A

To provide a potential source of DC power when sunlight is present

22
Q

What are the 4 components of a solar charging system?

A

Solar array
Regulator
Battery or battery bank
Conductors (wiring)

23
Q

What is the most important part of the solar panel? And what do they do?

A

Silicon cells. It’s a non-metal with conductive properties that give it the ability to convert sunlight into electricity

24
Q

What are the three types of silicon?

A

Single cell (monocrystalline)
Polycrystalline
Amorphous

25
Q

What is the efficiency and life expectancy of the monocrystalline panel

A 
High efficiency (approx 12-16%)
Longest life (25-30)
26
Q

What is the efficiency of polycrystalline?

A

Approx 11-12%

27
Q

Which type of silicon is the most susceptible to output loss does to heat?

A

Polycrystalline

28
Q

Which type of silicon is:
Blue:
Black:
Brown:

A

Blue is polycrystalline
Black is crystalline
Brown is amorphous

29
Q

How efficient is amorphous?

A

6-8%

30
Q

When is amorphous generally used?

A

On calculators, trickle charge, or flexible panels

31
Q

What is added to the front of a solar panel to add durability and protection for the silicon

A

Glass

32
Q

What is the cell count of a high voltage panel?

A

60 cells at 0.53-0.54 volts/cell

33
Q

What is the cell count of a convention solar panel

A

36 cells at 0.5 volts/cell

34
Q

What’s the cell count of a self-regulating panel?

A

30-33 cells at 0.48 volts/cell

35
Q

What regulator do you need to use on a high voltage panel?

A

An MPPT ( multi power point tracker)

36
Q

What regulator do you need to use on a conventional solar panel?

A

A PWN (pulse width modulation) controller to reduce the voltage to 14.5V

37
Q

How is a solar panel rated?

A

In peak wattage at 24C and 1000watts per square meter of solar radiation

38
Q

What is the rate of loss due to temp?

A

0.4 volts for every 5C change above 27C

39
Q

What is the purpose of a charge controller?

A

To protect the batteries from overcharging

40
Q

What should you use to clean a solar panel?

A

Use a mild detergent and soft cloth

Rv (23 decks)

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