The pure sine wave inverter and the modified sine wave inverter are similar devices differentiated by the quality of their output voltage.
The pure sine wave inverter is of better quality, producing a cleaner and more stable power. This inverter is of course more expensive to purchase, starting around $400 up to $3000.
However, if you do not want to damage sensitive equipment such as a computer, a laser printer, a flat screen TV, a sound system etc... it is compulsory in my opinion to buy the proper power inverter.
You can also decide to select a plain inverter or an inverter charger that will charge your battery bank.
If you are hooked up to an electricity service or use a generator most of the time or simply an alternator as sources of energy, you will have to buy a powerful charger to regulate the battery charging.
Then, instead of a plain inverter, a combo inverter charger makes sense since it will only cost a little bit extra.
The option of a built-in charger, usually with a multistage high output, may be the best choice. Many large inverters (more than 1000 watts) come with this option.
You can use it instead of the converter charger normally supplied with the RV. It will probably do a better job, the converter being kept only as a back up.
These inverter chargers are normally multistage and deliver 25 to 150 amps of charge current, working very well with generators.
However, if most of the time you are boondocking and using solar panels to charge your house batteries, you do not necessarily need to pay extra to get an inverter charger unit.
A plain inverter would fulfill all your needs since the solar panels are wired to a regulator to control the charge, directly delivering DC current to your battery bank.
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