Somewhat wacko battery/solar question
I have two 100 Ah Renogy AGM batteries in my TT, connected to two Renogy 100 watts solar panels on the roof via a Renogy 30A PWM controller. I want to install an inverter so I can use coffee make...
Forum Discussion
Well, lets assume your two batteries total about 200a/hrs, with a lower available limit of say a 50% depth of discharge…And since with 200w of solar, your batteries are typically topped off by 10:00am, let’s then assume that at about 75’ish % average PV efficiency you recovered maybe 15a/hrs from sunrise to 1000, which would hypothetically suggest a morning awakening SOC low of about 85% - If my guess is close (??) I’d call that fairly high!!
FWIW, with my former two Golf Cart 6v, I had no problem running a 1300+w Keurig coffee maker repeatedly (typically about a 2 min brew per cup), using a 1800w inverter, but not so with a 1500w microwave, because microwave’s are heavily ‘reactive’ loads (coffee makers are resistive)…So, I swapped out the power sucking 1500w Microwave for a far more ‘RV practical 850w Panasonic model’ which actually works out just perfectly!
Eventually I switched to a *better 2k watt pure-sine pass-thru (shore power) inverter-charger and using the same GC batteries could even run the 11kbtu Coleman air conditioner for short periods (compressor cycling, concurrent with solar), so with a coffee maker you should have no problemo!
To prevent nagging battery-to-inverter voltage sags (and inverter alarms - ugg…) its best to use robust sized battery cables - mine are heavy 0004 ought… Also, beyond the all the marketing hype behind inverter ‘advertised watt ratings’ you’ll also want to know the inverter’s surge rating and the duration of surge condition…Know that not all inverter’s of the same wattage rating will handle a reactive load in quite the same way - Models that don’t spec these additional two stats should not be considered - JMHO…
*4500w surge or 5 sec
FWIW, I’ve since ditched the GC batteries in favor of Lithium, which offer very little voltage sag along with a uber deep depth of discharge (DOD)…
Hope this Helps :)
3 tons
FWIW, with my former two Golf Cart 6v, I had no problem running a 1300+w Keurig coffee maker repeatedly (typically about a 2 min brew per cup), using a 1800w inverter, but not so with a 1500w microwave, because microwave’s are heavily ‘reactive’ loads (coffee makers are resistive)…So, I swapped out the power sucking 1500w Microwave for a far more ‘RV practical 850w Panasonic model’ which actually works out just perfectly!
Eventually I switched to a *better 2k watt pure-sine pass-thru (shore power) inverter-charger and using the same GC batteries could even run the 11kbtu Coleman air conditioner for short periods (compressor cycling, concurrent with solar), so with a coffee maker you should have no problemo!
To prevent nagging battery-to-inverter voltage sags (and inverter alarms - ugg…) its best to use robust sized battery cables - mine are heavy 0004 ought… Also, beyond the all the marketing hype behind inverter ‘advertised watt ratings’ you’ll also want to know the inverter’s surge rating and the duration of surge condition…Know that not all inverter’s of the same wattage rating will handle a reactive load in quite the same way - Models that don’t spec these additional two stats should not be considered - JMHO…
*4500w surge or 5 sec
FWIW, I’ve since ditched the GC batteries in favor of Lithium, which offer very little voltage sag along with a uber deep depth of discharge (DOD)…
Hope this Helps :)
3 tons
