Will's 48V system in an RV

All this electrical stuff is so confusing!

OK - I want to set up Will's 48V system (48 V Solar System for Beginners: ) and I'm struggling with a few things. Maybe I'm not understanding correctly to install it in my skoolie conversion.

Goal: Be able to have an independent system that can operate some AC appliances while I'm on the road, handle 50-amp shore power when parked, serve world peace during downtime. (ok, the last is just a high hope)

What I have:

• LV6548 MPP Solar Inverter/Charger
• 50-amp input for shore power
• Breaker box for AC output
• 800 watts of solar panels

What I need:

• Batteries
• Anything else?

I'm working on my power requirements spreadsheet, but I'm getting horribly lost there. (watts/volts = amps. 65-watt appliance/120 volts = .54 amps per hour? And how does that equate battery power on this system?)

Any advice/instructions would be greatly appreciated.

Skip the amp/hrs and stick with watt/hrs. Watt/hrs will not need a conversion across the voltages from 240/120/48
Certainly the battery must be able to support the full draw of the inverter.

Next stupid question (these are Inverter Mode specs from the manual):

• 6500 watt rated output power
• Output voltage waveform = pure sine wave
• Output voltage regulation = 120VAC +/- 5%
• Peak Efficiency 91%
• Overload Protection = 100ms@>-205% load; 5s@>-150% load; 10s@110%-150% load
• High DC Recovery Voltage = 64Vdc
• High DC Cut-off Voltage = 66Vdc

These are good numbers, yes?

So, what is the full draw of the inverter? And how do I calculate the number of batteries needed?

6500/48 = 135 I would be looking for enough battery to go 300+ amps although 150 might work as a minimum.
This rating might be easily covered by the time enough watt/hr capacity is added up.
What battery are you looking at?

I have just started looking on Amazon. Some of those prices look too good to be true. Is there a link where I can compare lithium batteries for performance?

Most RV's have lots of 12VDC lights and perhaps even some small appliances. I assume you don't have those if you are going to a 48VDC system. Otherwise you'll need to include a buck converter (48V to 12V) big enough for those 12V loads.

Strictly a 48v system.