inverter question


larryccf1

New Member
as some may have read in the class B forum, i'm planning on building a class B van

only area i'm fairly weak in is electrical power draws - i've found DC to AC power inverters that will deliver 900Watts of 120V

i was thinking to install two 100 amp hour deep cycle batteries, the sprinter dodge van has an auxiliary battery isolater and disconnect as an option, as well as a 220 amp alternator.

will i be able to run a small coffee maker, 700 watt microwave or a tv (LCD) when parked with no generator running, and if so, for how long? don't plan on using all three at same time but for instance, the TV, without knowing the current draw, but using my desktop computer as a ref, it's drawing .9 amp 120V) - how long would those two batteries support TV useage before having to turn generator on?

tks
 

larryccf1

New Member
RE: inverter question

wow, kind of feel like i posted on a foriegn language board in the wrong language

for those that read and are curious on the info - i forgot, a friend of mine is an electrical engineer (in fact he mfgrs a ultra-sound tank monitor for RVs as well as a circuit board that monitors battery voltage and starts the generator when batteries go too low)

the answer, everything seems to be measured in wattage, that watts are the same no matter the voltage, so a 100 amp hour 12V battery (in ideal conditions) will have 1200 watts at full charge.
A 19" Samsung LCD tv draws 50 watts, so theoretically the battery will support the TV for 24 hours useage.

Inverter suffers efficiency loss, as do other items in the system, but still, i'm safe assuming 4-6 hours of TV time plus a pot of coffee, off one battery. If i install two batteries, i'm good to go for the above and overnight useage on the refrig, furnance, whatever.
 

DL Rupper

Senior Member
Re: inverter question

Duh, huh :clown: Those of us that read are just RVers. Sounds like you already had the answer. I'm impressed. :laugh:
 

elkhartjim

Senior Member
Re: inverter question

Wonder if he was checking us or his electrical engineering friend? Inquirying minds always want to know.
 

dbl-d

New Member
Re: inverter question

Didn't realize we needed an engineering degree to own an RV. Maybe I better rethink getting one. :laugh:
 
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