solar panel with 14V with 28cell

[ckchok]

No grounding on mod sine inverters

if you ground + & - on the battery, you create a dangerous short circuit.

Often, the battery - is connected to ground in a car, and a mod sine inverter works there, but there is a good reason the manuals for mod sine inverters don't mention grounding, it will blow something up.

But getting shocks is not normal, even with mod sine.

Ok thanks for explaination.

Or is it possible to add the diode for +/- terminal inbetween MOD sine wave inverter and battery. To prevent the AC current feedback to battery ?

[Mike90250]

Adding a diode anywhere, will just increase overall system losses to the point the inverter may shut down (diodes add about 1V drop/loss per each diode). If you are getting shocks, something is wrong, and diodes won't fix it.